Abstract

All-optical phase shifters and switches play an important role for various all-optical applications including all-optical signal processing, sensing and communication. In this paper, we demonstrate a fiber all-optical phase shifter using few-layer 2D material tungsten disulfide (WS2) deposited on a tapered fiber. WS2 absorbs injected 980 nm pump (control light) and generates heat, which changes the refractive index of both WS2 and tapered fiber due to thermo-optic effect and achieves a maximum phase shift of 6.1π near 1550 nm. The device has a loss of 3.7 dB. By constructing a Mach-Zehnder interferometer with WS2 based phase shifter in one arm, an all-optical switch is also obtained with an extinction ratio of 15 dB and a rise time of 7.3 ms. This all fiber low-cost and compact optical phase shifter and switch demonstrates the potential of 2D transition metal dichalcogenides for all-optical signal processing devices.

© 2017 Optical Society of America

1. Introduction

Two-dimensional (2D) materials have attracted intense attention after the discovery of graphene [1–4]. Many optical devices based on graphene has been demonstrated including optical modulator [4–6], photodetector [3], polarizer [7] and switch [8]. Besides graphene, novel 2D materials have been reported, including graphene oxide [9], topological insulators (TIs) [10–14], transition metal dichalcogenides (TMDs) [15–24], and black phosphorus (BP) [25–29], etc. Among these 2D materials, TMDs have been paid special attention because TMDs represent a class of materials with similar photonic and electronic properties, including high optical nonlinearity [30] and saturable absorption [17]. Investigation on one TMD material may benefit the research on other TMDs. Recently, a variety of TMDs have been demonstrated for mode-locked and Q-switched lasers as saturable absorbers [15–24].

Meanwhile, all-optical devices at telecommunication wavelength of 1550 nm are of importance for modern optical communications such as all-optical routing, modulation and optical logic gate. A compact and low-cost fiber device with such functions is always desired to be compatible to current fiber system. A few demonstrations of all-optical modulator and phase shifter based on graphene have been reported [5, 6, 8]. Graphene has a uniform absorption in a wide spectrum which is good for absorption based devices. However for some other all-optical devices based on optical phase tuning such as phase shifter, this is not desired because it induces additional loss at signal wavelength. For these phase-tuning devices the wideband absorption of graphene becomes a drawback and a better choice is the material that absorbs more at the wavelength of control light and less at the wavelength of signal light, i.e., the material should have non-uniform absorption in the spectrum. Moreover, the choice of control wavelength should be compatible to current fiber system near 1550 nm so that the device can be easily incorporated into telecommunication applications.

In this work, a proof-of-concept fiber all-optical phase shifter operating near 1550 nm is fabricated by depositing few-layer TMD material tungsten disulfide (WS2) to a tapered fiber. The bandgap of WS2 near 1.3 eV (954 nm) [17] allows good absorption of the pump (control light) at 980 nm and weak absorption of the signal light near 1550 nm. The phase shifter is based on thermo-optic effect. When the pump at 980 nm is injected to the deposition area, WS2 absorbs the light, generates heat and changes the refractive index of both WS2 and tapered fiber and thus tunes the optical phase of 1550 nm signal light propagating through the fiber. The maximum phase tuning range is 6.1π with a slope efficiency of 0.0174π/mW. By incorporating this WS2 based phase shifter to a fiber Mach-Zehnder interferometer (MZI), an all-optical switch is also demonstrated. The switch has an extinction ratio of 15 dB and a rising time of 7.3 ms. Noting the deposition length of WS2 is only ~500 μm, this multi-function device based on WS2 deposited tapered fiber has the potential to be very compact for many all-optical applications including optical routing, optical logic gate and optical signal processing.

2. Material preparation and characterization

The WS2 deposited tapered fiber is the key element in the all-optical phase shifter. It is fabricated using the following two steps. Firstly, WS2 nanosheets are prepared using standard liquid-phase exfoliation (LPE) method [18]. Briefly, 5 mg WS2 powders are dispersed in 1.5 mg/ml sodium cholate (SC, as surfactant) aqueous solution and sonicated for 1 hour using a horn probe sonic tip. The dispersions are then centrifuged at 3000 rpm for 90 minutes to remove the unexfoliated flakes. The top 1/2 of the dispersions is collected by pipette. The prepared WS2 dispersions have a concentration of ~0.015 mg/ml. Figure 1(a) shows the transmission electron microscope (TEM) image of the prepared WS2 nanosheets. The typical size of nanosheets is a few hundreds of nanometers. Secondly, optical driven deposition is utilized to deposit WS2 nanosheets to the tapered fiber [31]. Briefly, a tapered fiber (SMF28) with a diameter of ~10 μm is immersed in WS2 dispersions. By applying light through the tapered fiber, leaked optical field near the tapered fiber attracts the WS2 nanosheets to the tapered fiber. The output power of the tapered fiber is monitored by an optical power meter to control the deposition process. The loss of the fabricated WS2 tapered fiber is 3.5 dB near 1550 nm. In the whole fabrication, there is no other chemicals or index matching gel used.

 

Fig. 1 (a) TEM image of WS2 nanosheets in the dispersions, (b) Raman spectrum of WS2 deposited on tapered fiber, (c) microscopic and (d) SEM images of WS2 deposited tapered fiber.

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Raman spectroscopy is utilized to confirm the deposited material on tapered fiber, shown in Fig. 1(b). Clear fingerprint peaks of WS2 can be observed. The distance between E12g and A1g peaks is 64.3 cm−1, meaning the average number of layers is 3-5 [32]. Microscopic image of WS2 tapered fiber is shown in Fig. 1(c). Deposited material can be clearly observed. The length of the deposited region is ~500 μm. Because scanning electron microscope (SEM) image requires gold deposition on the target sample which will damage our prepared WS2 tapered fiber. A similar sample of WS2 tapered fiber is used for the SEM imaging, shown in Fig. 1(d). It should be noted that in an optical driven deposition process WS2 nanosheets are randomly attached to the waist region of the tapered fiber, which is different from the graphene deposition based on film transfer.

3. Experiments and results

3.1 All-optical phase shifter

The all-optical phase shifter is shown in the red frame in Fig. 2. It consists of two 980/1550 wavelength demultiplexers (WDMs) and a WS2 deposited tapered fiber in the middle. 980 nm pump (control light) is injected from the first WDM and the residual 980 nm light is extracted by the second WDM. WS2 absorbs 980 nm light, generates heat and changes the refractive index of both WS2 and tapered fiber due to thermal-optic effect. When 1550 nm signal light propagates through the tapered fiber, its optical phase is modified accordingly. The index temperature coefficient of WS2 is estimated to be 2.48~5.48∙10-4/◦C. More details are given in section 4.2 in Discussion. Although 980 nm light is slightly below the bandgap of ~1.3 eV (954 nm) for few-layer WS2, edge states of WS2 nanosheets has been found to allow the absorption to extend to near 2 μm [33]. Moreover the absorption of WS2 decreases with the increase of wavelength which allows higher absorption at pump wavelength for better control efficiency and weaker absorption at signal wavelength for lower loss. The total loss of the phase shifter is ~3.7 dB near 1550 nm (0.2 dB from WDMs) and ~6 dB at 980 nm (1 dB from WDMs). To measure the phase shift value, the phase shifter is embedded into one arm of a fiber Mach-Zehnder interferometer, shown in Fig. 2. A sweeping continuous wave (CW) laser source near 1550 nm (Agilent 81640A) is used to measure the shift of the transmission spectrum. A 70:30 fiber splitter is used and 70% of the input 1550 nm light power is fed into the phase shifter’s arm to compensate the loss. In the other arm of the MZI, a tunable delay is inserted to better adjust the arm length. Two arms are finally combined together by a 50:50 fiber coupler. The output from the coupler is monitored by an optical spectrum analyzer (Yokogawa AQ6370C) for its spectral properties, and a 2.5 GHz oscilloscope (Agilent DSO9254A) with a 10 GHz photodetector (EOT 3500F) for its time-domain properties. The fiber lengths of two arms are very close to each other to guarantee a good interference result.

 

Fig. 2 Experimental setup of the all-optical phase shifter and switch based on WS2 deposited tapered fiber.

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Figure 3 summarizes the phase shift property of the device. The blue curve in Fig. 3(a) shows the transmission spectrum at 0 phase shift without 980 nm pump. The free spectral range (FSR) is 0.173 nm, corresponding to a frequency FSR of 21.73 GHz near 1565 nm. The time difference of two arms is therefore 46.24 ps and the length difference is 9.43 mm. When the 980 nm pump is injected, WS2 absorbs the pump light, generates heat and modifies the refractive index of both WS2 and tapered fiber due to thermo-optic effect. The transmission loss of 980 nm pump from the first WDM to the second WDM is ~6 dB with 1 dB loss from two WDMs and 5 dB absorption from the WS2 tapered fiber. When 980 nm pump is increased to 350 mW, the spectrum shifts ~0.53 nm to the right side, corresponding to a phase shift of ~6.1π. A typical spectrum with 5π phase shift (spectral shift of 2.5 FSRs) is shown as red curve in Fig. 3(a). In both two spectra, an extinction ratio of more than 15 dB can be observed.

 

Fig. 3 Transmission spectra of the MZI with 0 (blue) and 5π phase shift (red) using (a) a continuous wave laser source and (b) a mode-locked laser source (see Visualization 1). (c) Phase shift with respect to the injected pump power with two input power levels.

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For a thermal-optic device, it is the average power rather than the peak power that works. So we then change the light source to a mode-locked laser (1560 nm center wavelength, 20 nm bandwidth, 37 MHz repetition rate) with low average power (<4 mW) to monitor the spectral shift in real time when pump is applied. The measured transmission spectra are nearly identical to the results by using a CW laser, shown in Fig. 3(b). Although WS2 tapered fiber exhibits saturable absorption with a modulation depth of ~3% (0.15 dB), this contribution on the intensity is much weaker than the intensity variation of 15 dB caused by the MZI. In the supplementary video (see Visualization 1), we apply a saw wave 980 nm pump light (power changing from 0 to 250 mW, 3 s period) to the phase shifter, the rightwards and leftwards movement of the spectrum can be clearly observed.

The phase shift with respect to the pump power is shown in Fig. 3(c). Mode-locked laser source is used. Two different input average power levels of 5 dBm and −5 dBm are measured with nearly identical results, indicating that the phase shifter is less sensitive to the input power. For both power levels, a nearly linear relation is observed with a slope efficiency of ~0.0174π/mW.

There are a few reasons of choosing 980 nm wavelength as the pumping wavelength. Firstly, WS2 has a bandgap of ~1.96 eV for monolayer and ~1.3 eV for bulk [17], corresponding to the wavelength of 632 nm and 954 nm. Edge states in the WS2 nanosheets can further extend the absorption spectrum of WS2 and other TMDs to longer wavelength of 2 μm [33], but the absorption decreases with the increase of wavelength. Therefore pumping wavelength should be close to short wavelength for higher absorption. An obvious experimental support is that the insertion loss of WS2 tapered fiber is 3.5 dB at 1550 nm and 5 dB at 980 nm. Secondly, the pump light should be easy to combine with 1550 nm light for an all fiber system. A fiber 980/1550 WDM is a very mature commercial product because 980 nm wavelength is also the pumping wavelength for erbium-doped fiber (EDF) in fiber laser and fiber amplifier near 1550 nm. Moreover, the availability of high power 980 nm pump laser diode can provide much flexibility in the experiment.

3.2 All-optical switch

The whole MZI can also be utilized as an all-optical switch with two outputs. In the following experiments, a CW laser source centered at 1560 nm is used. A square wave electronic signal is injected into the analog modulation port of the pump driver and the pulsed 980 nm pump light is generated. Pump light is then applied to the phase shifter. Figure 4(a) shows the measured waveforms of pump power (yellow) and switch output at “output 1” port (blue). The repetition rate of the square wave is 10 Hz with a 30% duty cycle (i.e., 30 ms on, 70 ms off). A clear on-off operation of the switch is realized. The on-off extinction ratio is 15 dB obtained from Fig. 3(a) and 3(b). Bandwidth limitation effect can also be observed that both the rising edge and the falling edge of the switch output have been flattened. A zoomed view of a single off-on-off transition of the switch output is shown in Fig. 4(b). By using exponential fit (1-exp(-t/tr)) for the rising edge and exp(-t/tf) for the falling edge, the time constants are found to be tr = 7.3 ms for the rising edge and tf = 3.5 ms for the falling edge, shown as red curve in Fig. 4(b). The time constant for the rising edge is related to the process that WS2 absorbs pump light to raise the temperature and meanwhile heat gradually dissipates due to the air convection. The time constant for the falling edge is purely related to the heat dissipation of WS2 and the tapered fiber because there is no pump light. Figure 4(c) shows the complementary output at “output 2” port.

 

Fig. 4 (a) Pulsed pump light (yellow) and switch output at “output 1” port (blue), (b) a zoomed view of a single off-on-off transition of the switch (blue) and exponential fit (red), (c) complementary output at “output 2” port, and (d) output breaking when the MZI is over-driven.

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It is well known that the transmission curve of an MZI is a cosine function (1 + cosΔφ)/2 where Δφ represents the phase difference in the two arms of the MZI. If the peak power of the applied pump light is further increased to exceed π phase shift of the MZI, breaking of the output waveform from the switch can be observed, shown in Fig. 4(d). In this experiment, the peak power of the pump light is doubled. When the instant power of pump light increases at the beginning, the instant power of the switch output also increases, same as the normal case in Fig. 4(a). However, when the instant power of the pump light keeps increasing, the phase difference Δφ exceeds 2π and the MZI becomes biased reversely. Then the instant power of switch output decreases with the increase of instant power of pump light. When the instant power of pump light becomes to drop, all the above processes are reversed. Therefore one input square wave pump pulse breaks to two output pulses with one valley in the middle. This is similar to the case that the driving voltage exceeds Vπ in an MZI based electro-optic modulator. One can also note that the rising edge of such over-driven switch output is much sharper than that of normally driven output in Fig. 4(a). This is due to the fact that when the maximum pulse peak power of the pump light is increased, WS2 absorbs more light in the same time and generates more heat. As a result, the refractive index changes faster. This may help to increase the turn-on speed of the switch if the input signal is short enough to pass the switch before the switch transmission drops.

To further investigate the response speed of the phase shifter and switch, a sine wave waveform of the pump power is applied to measure the bandwidth of the device. The frequency of the sine-wave pump is varied from 10 Hz to 340 Hz by injecting electronic signal into the analog modulation port of the pump driver. The bandwidth of the analog modulation port is more than 1 kHz. When this sine wave pump light is applied to the phase shifter and switch, the output power from the MZI also exhibits sine wave waveform. The output waveform is measured by a 10 GHz photodetector and an oscilloscope. By comparing the amplitude of the output sine wave signal at different frequencies, the bandwidth of the device can be estimated. Typical sine wave power waveforms for the pump and the switch output are shown in Fig. 5(a) and 5(b). The frequency response of the phase shifter and switch is shown in Fig. 5(c) when the modulation frequency varies from 10 Hz to 340 Hz. It can be found that the 3-dB bandwidth of the device is near 320 Hz.

 

Fig. 5 Sine wave waveforms of (a) pump and (b) switch output with a repetition rate of 10 Hz, and (c) frequency response of the switch.

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4. Discussion

4.1. Comparison among different all-optical devices

In this work, our WS2 based all-optical phase shifter and switch is aimed for all-optical signal processing. Our purpose is to provide a fiber compatible, low-cost, simple-fabrication and compact solution for all-optical switches. Meanwhile there are many applications of optical switches that do not require high speed. For example, the connections among different fiber links in the data center are usually re-allocated in a frequency of hours or days and a switching time of a few milliseconds is acceptable.

Here we provide comparisons with different reported all-optical switches. The comparison includes two parts: comparison between 2D materials and other nonlinear materials which shows the advantages brought by the unique properties of 2D materials, and comparison between WS2 based and graphene based switches which explains the motivation of using WS2.

Table 1 summarizes the comparison among 2D materials and other nonlinear materials. For all-optical switches, the key components are the nonlinear materials. For the designs with highly nonlinear fiber (HNLF), the systems usually require meter-long HNLF. The system cannot be compact. The cost of HNLF is also high. For the designs with nonlinear waveguide, such as silicon and chalcogenides, the systems can be compact because of the small chip size, but the coupling between fiber system and chip usually leads to at least 3-5 dB loss. Moreover, the waveguide itself adds additional loss due to the unsmooth side wall and free carrier absorption (for semiconductor materials). The fabrication cost is also high due to many steps of fabrication in the clean room. In contrast, 2D materials based optical switches can be potentially very compact because the light-material interaction region is only micron to millimeter long. The loss is not very high because the deposition/transfer process can be controlled. The cost is also low because no complicated fabrication is involved.

Tables Icon

Table 1. Comparison among all-optical devices based on 2D materials and other nonlinear materials

Table 2 summarizes the comparison between WS2 based and graphene based all-optical switches. Both WS2 and graphene belong to 2D materials, however, there are still a few different properties when applied to an all-optical switch. The comparison is performed with a recently published work on a graphene based all-optical switch [8], which presented a very impressive work and partially triggered our idea. We fully respect authors’ work in Ref [8].

Tables Icon

Table 2. Comparison between our work and graphene based device

Graphene in Ref [8]. is fabricated by chemical vapor deposition (CVD) and transferred to the tapered fiber by etching away the copper foil. The graphene is very thin (a few nanometers) and therefore the light-material interaction with graphene on the cross section of tapered fiber is weak. In our work, WS2 nanosheets are fabricated by liquid phase exfoliation (LPE) and transferred to the tapered fiber by optical driven deposition. The transfer process can be monitored in real time and the total loss of WS2 deposited tapered fiber can be controlled by controlling the deposition time. The thickness of WS2 surrounding the tapered fiber is micrometer level, which enhances the light-material interaction on the cross section. Therefore, in our device, the interaction length is very short, only 500 μm, showing the great potential for a very compact device. Moreover, the interaction between 980 nm light and material surrounding the tapered fiber is naturally weaker than 1550 nm because the beam size of 980 nm is smaller than that of 1550 nm in the tapered fiber. If a material with uniform absorption at 980 nm and 1550 nm is used, such as graphene, the device absorption at 980 nm would be smaller than that at 1550 nm, which obviously reduces the control efficiency of the device. In our work, we use WS2 which has a higher absorption at 980 nm and compensates the weaker light-material interaction at 980 nm caused by the smaller beam size. In Table 2, it can be found that our device has a better control efficiency which is defined as the phase shift normalized to pump power and interaction length, or slope efficiency ( = phase shift/pump power) divided by interaction length.

4.2. Thermo-optic coefficient of WS2

The thermo-optic coefficient of WS2 can be roughly estimated. The mode distribution on the cross section of WS2 tapered fiber is shown in Fig. 6. The thickness of deposited WS2 is estimated to be 0.5 μm and the diameter of tapered fiber is 10 μm. The refractive index of WS2 is estimated to be ~3.67 at 980 nm and ~3.20 at 1550 nm by extending the data in Ref [34]. to the near IR region. The power percentage is ~3% in the WS2 area and ~96% in the tapered fiber for both 980 nm and 1550 nm because the index of WS2 is higher at 980 nm than that at 1550 nm.

 

Fig. 6 Mode distribution of (a) 980 nm light and (b) 1550 nm light, and (c) mode distribution in the middle line.

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By comparing with the data in a similar graphene based all-optical switch [8], we roughly estimate the local temperature change of WS2 tapered fiber is 40~60◦C for a π phase shift. Using the relation of Δn∙L = λ/(2n), where the interaction length L = 500 μm, operating wavelength λ = 1550 nm and effective index n = ~1.44. The index change of our device is Δn = 1.08∙10−3. Because the power percentage in WS2 and tapered fiber is ~3% and 96%, the contribution of index change is estimated by Δn = ΔnWS2∙3% + ΔnTF∙96%. Noting that the thermo-optic coefficient for silica fiber is ~1.1∙10−5/◦C, the index change of tapered fiber ΔnTF is 4.4~6.6∙10−4 for a temperature change of 40~60◦C. The index change of WS2 ΔnWS2 is then found to be 1.49~2.19∙10−2, corresponding to a thermo-optic coefficient of 2.48~5.48∙10−4/◦C. This result indicates that WS2 and tapered fiber nearly have equal contribution on the index change.

To further confirm the above estimation on the thermo-optic coefficient of WS2, an ellipsometric measurement has been performed. The WS2 sample is prepared by CVD on a sapphire substrate. The sample is grown to a very large thickness of ~200 nm to meet the requirement of ellipsometer. The measurement results are shown in Fig. 7.

 

Fig. 7 (a) Refractive index of WS2 and (b) difference of refractive index under different temperature.

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The index of WS2 sample with respect to wavelength in Fig. 7(a) has nearly identical profile compared with the data in Ref [34], which confirms the validity of our ellipsometric measurement. The index at 1550 nm is ~3.14, slightly smaller than that from Ref [34], which may be due to the property difference between thin and thick samples or the error of different analysis methods. The relative index change with temperature is shown in Fig. 7(b). A thin heater is placed under sample to control the temperature. A linear fit of data shows a thermo-optic coefficient near 3.36∙10−4/◦C, which is consistent with the above estimation based on mode distribution in the tapered fiber. It should be noticed that the refractive index value is obtained by fitting the raw data of Ψ and Δ of ellipsometric measurement. Therefore it is very difficult to estimate the error of index value. But mode distribution analysis and ellipsometric measurement both give a thermo-optic coefficient on a level of 10−4/◦C which is thus believed to be a reasonable result.

5. Conclusions

In conclusion, we have demonstrated a fiber all-optical phase shifter and switch based on WS2 deposited tapered fiber. By absorbing the pump (control light) at 980 nm, WS2 generates heat and changes the refractive index of both WS2 and tapered fiber due to thermo-optic effect. For the phase shifter, a phase shift of 6.1π is obtained under a maximum pump power of 350 mW, corresponding to a slope efficiency of 0.0174π/mW. For the switch, the on-off extinction ratio of ~15 dB is obtained with a rise time of 7.3 ms and a 3-dB bandwidth of 320 Hz. The thermo-optic coefficient of WS2 is estimated to be ~10−4/◦C. Our work may benefit the research on photonic applications of 2D TMD materials and pave the way of TMD materials for practical applications such as all-optical signal processing and optical routing.

Funding

National Natural Science Foundation of China (NSFC) (61505105, 61675217, 61522510); Shanghai Yangfan Program (No. 14YF1401600); Strategic Priority Research Program of CAS (XDB16030700); Key Research Program of Frontier Science of CAS (QYZDB-SSW-JSC041); STCSM Excellent Academic Leader of Shanghai (17XD1403900); Open Fund of IPOC (BUPT).

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22. D. Mao, X. Y. She, B. B. Du, D. X. Yang, W. D. Zhang, K. Song, X. Q. Cui, B. Q. Jiang, T. Peng, and J. L. Zhao, “Erbium-doped fiber laser passively mode locked with few-layer WSe2/MoSe2 nanosheets,” Sci. Rep. 6(1), 23583 (2016). [CrossRef]   [PubMed]  

23. W. S. Li, J. Peng, Y. L. Zhong, D. D. Wu, H. Y. Lin, Y. J. Cheng, Z. Q. Luo, J. Weng, H. Y. Xu, and Z. P. Cai, “Orange-light passively Q-switched Pr3+-doped all-fiber lasers with transition-metal dichalcogenide saturable absorbers,” Opt. Mater. Express 6(6), 2031–2039 (2016). [CrossRef]  

24. P. Yan, A. Liu, Y. Chen, H. Chen, S. Ruan, C. Guo, S. Chen, I. L. Li, H. Yang, J. Hu, and G. Cao, “Microfiber-based WS2-film saturable absorber for ultra-fast photonics,” Opt. Mater. Express 5(3), 479–489 (2015). [CrossRef]  

25. S. B. Lu, L. L. Miao, Z. N. Guo, X. Qi, C. J. Zhao, H. Zhang, S. C. Wen, D. Y. Tang, and D. Y. Fan, “Broadband nonlinear optical response in multi-layer black phosphorus: an emerging infrared and mid-infrared optical material,” Opt. Express 23(9), 11183–11194 (2015). [CrossRef]   [PubMed]  

26. Z. N. Guo, H. Zhang, S. B. Lu, Z. T. Wang, S. Y. Tang, J. D. Shao, Z. B. Sun, H. H. Xie, H. Y. Wang, X. F. Yu, and P. K. Chu, “From Black Phosphorus to Phosphorene: Basic Solvent Exfoliation, Evolution of Raman Scattering, and Applications to Ultrafast Photonics,” Adv. Funct. Mater. 25(45), 6996–7002 (2015). [CrossRef]  

27. Z. C. Luo, M. Liu, Z. N. Guo, X. F. Jiang, A. P. Luo, C. J. Zhao, X. F. Yu, W. C. Xu, and H. Zhang, “Microfiber-based few-layer black phosphorus saturable absorber for ultra-fast fiber laser,” Opt. Express 23(15), 20030–20039 (2015). [CrossRef]   [PubMed]  

28. J. F. Li, H. Y. Luo, B. Zhai, R. G. Lu, Z. N. Guo, H. Zhang, and Y. Liu, “Black phosphorus: a two-dimension saturable absorption material for mid-infrared Q-switched and mode-locked fiber lasers,” Sci. Rep. 6(1), 30361 (2016). [CrossRef]   [PubMed]  

29. L. C. Kong, Z. P. Qin, G. Q. Xie, Z. N. Guo, H. Zhang, P. Yuan, and L. J. Qian, “Black phosphorus as broadband saturable absorber for pulsed lasers from 1 mu mu m to 2.7 mu m wavelength,” Laser Phys. Lett. 13(4), 045801 (2016). [CrossRef]  

30. K. Wang, Y. Feng, C. Chang, J. Zhan, C. Wang, Q. Zhao, J. N. Coleman, L. Zhang, W. J. Blau, and J. Wang, “Broadband ultrafast nonlinear absorption and nonlinear refraction of layered molybdenum dichalcogenide semiconductors,” Nanoscale 6(18), 10530–10535 (2014). [CrossRef]   [PubMed]  

31. H. Wang, B. H. Chen, X. Y. Zhang, S. Liu, B. Q. Zhu, J. Wang, K. Wu, and J. P. Chen, “Ethanol catalytic deposition of MoS2 on tapered fiber,” Photonics Research 3(3), A102–A107 (2015). [CrossRef]  

32. H. R. Gutierrez, N. Perea-Lopez, A. L. Elias, A. Berkdemir, B. Wang, R. Lv, F. Lopez-Urias, V. H. Crespi, H. Terrones, and M. Terrones, “Extraordinary Room-Temperature Photoluminescence in Triangular WS2 Monolayers,” Nano Lett. 13(8), 3447–3454 (2013). [CrossRef]   [PubMed]  

33. M. Jung, J. Lee, J. Park, J. Koo, Y. M. Jhon, and J. H. Lee, “Mode-locked, 1.94-mu, all-fiberized laser using WS2 based evanescent field interaction,” Opt. Express 23(15), 19996–20006 (2015). [CrossRef]   [PubMed]  

34. S.-L. Li, H. Miyazaki, H. Song, H. Kuramochi, S. Nakaharai, and K. Tsukagoshi, “Quantitative Raman Spectrum and Reliable Thickness Identification for Atomic Layers on Insulating Substrates,” ACS Nano 6(8), 7381–7388 (2012). [CrossRef]   [PubMed]  

References

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  1. F. Bonaccorso, Z. Sun, T. Hasan, and A. C. Ferrari, “Graphene photonics and optoelectronics,” Nat. Photonics 4(9), 611–622 (2010).
    [Crossref]
  2. A. Martinez and Z. Sun, “Nanotube and graphene saturable absorbers for fibre lasers,” Nat. Photonics 7(11), 842–845 (2013).
    [Crossref]
  3. T. Mueller, F. Xia, and P. Avouris, “Graphene photodetectors for high-speed optical communications,” Nat. Photonics 4(5), 297–301 (2010).
    [Crossref]
  4. M. Liu, X. Yin, E. Ulin-Avila, B. Geng, T. Zentgraf, L. Ju, F. Wang, and X. Zhang, “A graphene-based broadband optical modulator,” Nature 474(7349), 64–67 (2011).
    [Crossref] [PubMed]
  5. S. L. Yu, X. Q. Wu, K. R. Chen, B. G. Chen, X. Guo, D. X. Dai, L. M. Tong, W. T. Liu, and Y. R. Shen, “All-optical graphene modulator based on optical Kerr phase shift,” Optica 3(5), 541–544 (2016).
    [Crossref]
  6. W. Li, B. G. Chen, C. Meng, W. Fang, Y. Xiao, X. Y. Li, Z. F. Hu, Y. X. Xu, L. M. Tong, H. Q. Wang, W. T. Liu, J. M. Bao, and Y. R. Shen, “Ultrafast All-Optical Graphene Modulator,” Nano Lett. 14(2), 955–959 (2014).
    [Crossref] [PubMed]
  7. Q. Bao, H. Zhang, B. Wang, Z. Ni, C. H. Y. X. Lim, Y. Wang, D. Y. Tang, and K. P. Loh, “Broadband graphene polarizer,” Nat. Photonics 5(7), 411–415 (2011).
    [Crossref]
  8. X. T. Gan, C. Y. Zhao, Y. D. Wang, D. Mao, L. Fang, L. Han, and J. L. Zhao, “Graphene-assisted all-fiber phase shifter and switching,” Optica 2(5), 468–471 (2015).
    [Crossref]
  9. X. Li, Y. Tang, Z. Yan, Y. Wang, B. Meng, G. Liang, H. Sun, X. Yu, Y. Zhang, X. Cheng, and Q. J. Wang, “Broadband Saturable Absorption of Graphene Oxide Thin Film and Its Application in Pulsed Fiber Lasers,” IEEE J. Sel. Top. Quantum Electron. 20, 1–7 (2014).
  10. P. G. Yan, R. Y. Lin, S. C. Ruan, A. J. Liu, H. Chen, Y. Q. Zheng, S. F. Chen, C. Y. Guo, and J. G. Hu, “A practical topological insulator saturable absorber for mode-locked fiber laser,” Sci. Rep. 5(1), 8690 (2015).
    [Crossref] [PubMed]
  11. Z.-C. Luo, M. Liu, H. Liu, X.-W. Zheng, A.-P. Luo, C.-J. Zhao, H. Zhang, S.-C. Wen, and W.-C. Xu, “2 GHz passively harmonic mode-locked fiber laser by a microfiber-based topological insulator saturable absorber,” Opt. Lett. 38(24), 5212–5215 (2013).
    [Crossref] [PubMed]
  12. H. Yu, H. Zhang, Y. Wang, C. Zhao, B. Wang, S. Wen, H. Zhang, and J. Wang, “Topological insulator as an optical modulator for pulsed solid‐state lasers,” Laser Photonics Rev. 7(6), L77–L83 (2013).
    [Crossref]
  13. J. Bogusławski, G. Soboń, R. Zybala, K. Mars, A. Mikula, K. M. Abramski, and J. Sotor, “Investigation on pulse shaping in fiber laser hybrid mode-locked by Sb2Te3 saturable absorber,” Opt. Express 23(22), 29014–29023 (2015).
    [Crossref] [PubMed]
  14. J. Lee, J. Koo, Y.-M. Jhon, and J. H. Lee, “A femtosecond pulse erbium fiber laser incorporating a saturable absorber based on bulk-structured Bi2Te3 topological insulator,” Opt. Express 22(5), 6165–6173 (2014).
    [Crossref] [PubMed]
  15. H. Chen, Y. Chen, J. Yin, X. Zhang, T. Guo, and P. Yan, “High-damage-resistant tungsten disulfide saturable absorber mirror for passively Q-switched fiber laser,” Opt. Express 24(15), 16287–16296 (2016).
    [Crossref] [PubMed]
  16. Z. Q. Luo, D. D. Wu, B. Xu, H. Y. Xu, Z. P. Cai, J. Peng, J. Weng, S. Xu, C. H. Zhu, F. Q. Wang, Z. P. Sun, and H. Zhang, “Two-dimensional material-based saturable absorbers: towards compact visible-wavelength all-fiber pulsed lasers,” Nanoscale 8(2), 1066–1072 (2016).
    [Crossref] [PubMed]
  17. B. Chen, X. Zhang, K. Wu, H. Wang, J. Wang, and J. Chen, “Q-switched fiber laser based on transition metal dichalcogenides MoS2, MoSe2, WS2, and WSe2,” Opt. Express 23(20), 26723–26737 (2015).
    [Crossref] [PubMed]
  18. K. Wu, X. Zhang, J. Wang, X. Li, and J. Chen, “WS2 as a saturable absorber for ultrafast photonic applications of mode-locked and Q-switched lasers,” Opt. Express 23(9), 11453–11461 (2015).
    [Crossref] [PubMed]
  19. M. Zhang, G. H. Hu, G. Q. Hu, R. C. T. Howe, L. Chen, Z. Zheng, and T. Hasan, “Yb- and Er-doped fiber laser Q-switched with an optically uniform, broadband WS2 saturable absorber,” Sci. Rep. 5(1), 17482 (2015).
    [Crossref] [PubMed]
  20. R. I. Woodward, R. C. T. Howe, T. H. Runcorn, G. Hu, F. Torrisi, E. J. R. Kelleher, and T. Hasan, “Wideband saturable absorption in few-layer molybdenum diselenide (MoSe2) for Q-switching Yb-, Er- and Tm-doped fiber lasers,” Opt. Express 23(15), 20051–20061 (2015).
    [Crossref] [PubMed]
  21. S. H. Kassani, R. Khazaeizhad, H. Jeong, T. Nazari, D. I. Yeom, and K. Oh, “All-fiber Er-doped Q-Switched laser based on Tungsten Disulfide saturable absorber,” Opt. Mater. Express 5(2), 373–379 (2015).
    [Crossref]
  22. D. Mao, X. Y. She, B. B. Du, D. X. Yang, W. D. Zhang, K. Song, X. Q. Cui, B. Q. Jiang, T. Peng, and J. L. Zhao, “Erbium-doped fiber laser passively mode locked with few-layer WSe2/MoSe2 nanosheets,” Sci. Rep. 6(1), 23583 (2016).
    [Crossref] [PubMed]
  23. W. S. Li, J. Peng, Y. L. Zhong, D. D. Wu, H. Y. Lin, Y. J. Cheng, Z. Q. Luo, J. Weng, H. Y. Xu, and Z. P. Cai, “Orange-light passively Q-switched Pr3+-doped all-fiber lasers with transition-metal dichalcogenide saturable absorbers,” Opt. Mater. Express 6(6), 2031–2039 (2016).
    [Crossref]
  24. P. Yan, A. Liu, Y. Chen, H. Chen, S. Ruan, C. Guo, S. Chen, I. L. Li, H. Yang, J. Hu, and G. Cao, “Microfiber-based WS2-film saturable absorber for ultra-fast photonics,” Opt. Mater. Express 5(3), 479–489 (2015).
    [Crossref]
  25. S. B. Lu, L. L. Miao, Z. N. Guo, X. Qi, C. J. Zhao, H. Zhang, S. C. Wen, D. Y. Tang, and D. Y. Fan, “Broadband nonlinear optical response in multi-layer black phosphorus: an emerging infrared and mid-infrared optical material,” Opt. Express 23(9), 11183–11194 (2015).
    [Crossref] [PubMed]
  26. Z. N. Guo, H. Zhang, S. B. Lu, Z. T. Wang, S. Y. Tang, J. D. Shao, Z. B. Sun, H. H. Xie, H. Y. Wang, X. F. Yu, and P. K. Chu, “From Black Phosphorus to Phosphorene: Basic Solvent Exfoliation, Evolution of Raman Scattering, and Applications to Ultrafast Photonics,” Adv. Funct. Mater. 25(45), 6996–7002 (2015).
    [Crossref]
  27. Z. C. Luo, M. Liu, Z. N. Guo, X. F. Jiang, A. P. Luo, C. J. Zhao, X. F. Yu, W. C. Xu, and H. Zhang, “Microfiber-based few-layer black phosphorus saturable absorber for ultra-fast fiber laser,” Opt. Express 23(15), 20030–20039 (2015).
    [Crossref] [PubMed]
  28. J. F. Li, H. Y. Luo, B. Zhai, R. G. Lu, Z. N. Guo, H. Zhang, and Y. Liu, “Black phosphorus: a two-dimension saturable absorption material for mid-infrared Q-switched and mode-locked fiber lasers,” Sci. Rep. 6(1), 30361 (2016).
    [Crossref] [PubMed]
  29. L. C. Kong, Z. P. Qin, G. Q. Xie, Z. N. Guo, H. Zhang, P. Yuan, and L. J. Qian, “Black phosphorus as broadband saturable absorber for pulsed lasers from 1 mu mu m to 2.7 mu m wavelength,” Laser Phys. Lett. 13(4), 045801 (2016).
    [Crossref]
  30. K. Wang, Y. Feng, C. Chang, J. Zhan, C. Wang, Q. Zhao, J. N. Coleman, L. Zhang, W. J. Blau, and J. Wang, “Broadband ultrafast nonlinear absorption and nonlinear refraction of layered molybdenum dichalcogenide semiconductors,” Nanoscale 6(18), 10530–10535 (2014).
    [Crossref] [PubMed]
  31. H. Wang, B. H. Chen, X. Y. Zhang, S. Liu, B. Q. Zhu, J. Wang, K. Wu, and J. P. Chen, “Ethanol catalytic deposition of MoS2 on tapered fiber,” Photonics Research 3(3), A102–A107 (2015).
    [Crossref]
  32. H. R. Gutierrez, N. Perea-Lopez, A. L. Elias, A. Berkdemir, B. Wang, R. Lv, F. Lopez-Urias, V. H. Crespi, H. Terrones, and M. Terrones, “Extraordinary Room-Temperature Photoluminescence in Triangular WS2 Monolayers,” Nano Lett. 13(8), 3447–3454 (2013).
    [Crossref] [PubMed]
  33. M. Jung, J. Lee, J. Park, J. Koo, Y. M. Jhon, and J. H. Lee, “Mode-locked, 1.94-mu, all-fiberized laser using WS2 based evanescent field interaction,” Opt. Express 23(15), 19996–20006 (2015).
    [Crossref] [PubMed]
  34. S.-L. Li, H. Miyazaki, H. Song, H. Kuramochi, S. Nakaharai, and K. Tsukagoshi, “Quantitative Raman Spectrum and Reliable Thickness Identification for Atomic Layers on Insulating Substrates,” ACS Nano 6(8), 7381–7388 (2012).
    [Crossref] [PubMed]

2016 (7)

S. L. Yu, X. Q. Wu, K. R. Chen, B. G. Chen, X. Guo, D. X. Dai, L. M. Tong, W. T. Liu, and Y. R. Shen, “All-optical graphene modulator based on optical Kerr phase shift,” Optica 3(5), 541–544 (2016).
[Crossref]

H. Chen, Y. Chen, J. Yin, X. Zhang, T. Guo, and P. Yan, “High-damage-resistant tungsten disulfide saturable absorber mirror for passively Q-switched fiber laser,” Opt. Express 24(15), 16287–16296 (2016).
[Crossref] [PubMed]

Z. Q. Luo, D. D. Wu, B. Xu, H. Y. Xu, Z. P. Cai, J. Peng, J. Weng, S. Xu, C. H. Zhu, F. Q. Wang, Z. P. Sun, and H. Zhang, “Two-dimensional material-based saturable absorbers: towards compact visible-wavelength all-fiber pulsed lasers,” Nanoscale 8(2), 1066–1072 (2016).
[Crossref] [PubMed]

D. Mao, X. Y. She, B. B. Du, D. X. Yang, W. D. Zhang, K. Song, X. Q. Cui, B. Q. Jiang, T. Peng, and J. L. Zhao, “Erbium-doped fiber laser passively mode locked with few-layer WSe2/MoSe2 nanosheets,” Sci. Rep. 6(1), 23583 (2016).
[Crossref] [PubMed]

W. S. Li, J. Peng, Y. L. Zhong, D. D. Wu, H. Y. Lin, Y. J. Cheng, Z. Q. Luo, J. Weng, H. Y. Xu, and Z. P. Cai, “Orange-light passively Q-switched Pr3+-doped all-fiber lasers with transition-metal dichalcogenide saturable absorbers,” Opt. Mater. Express 6(6), 2031–2039 (2016).
[Crossref]

J. F. Li, H. Y. Luo, B. Zhai, R. G. Lu, Z. N. Guo, H. Zhang, and Y. Liu, “Black phosphorus: a two-dimension saturable absorption material for mid-infrared Q-switched and mode-locked fiber lasers,” Sci. Rep. 6(1), 30361 (2016).
[Crossref] [PubMed]

L. C. Kong, Z. P. Qin, G. Q. Xie, Z. N. Guo, H. Zhang, P. Yuan, and L. J. Qian, “Black phosphorus as broadband saturable absorber for pulsed lasers from 1 mu mu m to 2.7 mu m wavelength,” Laser Phys. Lett. 13(4), 045801 (2016).
[Crossref]

2015 (14)

H. Wang, B. H. Chen, X. Y. Zhang, S. Liu, B. Q. Zhu, J. Wang, K. Wu, and J. P. Chen, “Ethanol catalytic deposition of MoS2 on tapered fiber,” Photonics Research 3(3), A102–A107 (2015).
[Crossref]

P. Yan, A. Liu, Y. Chen, H. Chen, S. Ruan, C. Guo, S. Chen, I. L. Li, H. Yang, J. Hu, and G. Cao, “Microfiber-based WS2-film saturable absorber for ultra-fast photonics,” Opt. Mater. Express 5(3), 479–489 (2015).
[Crossref]

S. B. Lu, L. L. Miao, Z. N. Guo, X. Qi, C. J. Zhao, H. Zhang, S. C. Wen, D. Y. Tang, and D. Y. Fan, “Broadband nonlinear optical response in multi-layer black phosphorus: an emerging infrared and mid-infrared optical material,” Opt. Express 23(9), 11183–11194 (2015).
[Crossref] [PubMed]

Z. N. Guo, H. Zhang, S. B. Lu, Z. T. Wang, S. Y. Tang, J. D. Shao, Z. B. Sun, H. H. Xie, H. Y. Wang, X. F. Yu, and P. K. Chu, “From Black Phosphorus to Phosphorene: Basic Solvent Exfoliation, Evolution of Raman Scattering, and Applications to Ultrafast Photonics,” Adv. Funct. Mater. 25(45), 6996–7002 (2015).
[Crossref]

Z. C. Luo, M. Liu, Z. N. Guo, X. F. Jiang, A. P. Luo, C. J. Zhao, X. F. Yu, W. C. Xu, and H. Zhang, “Microfiber-based few-layer black phosphorus saturable absorber for ultra-fast fiber laser,” Opt. Express 23(15), 20030–20039 (2015).
[Crossref] [PubMed]

M. Jung, J. Lee, J. Park, J. Koo, Y. M. Jhon, and J. H. Lee, “Mode-locked, 1.94-mu, all-fiberized laser using WS2 based evanescent field interaction,” Opt. Express 23(15), 19996–20006 (2015).
[Crossref] [PubMed]

B. Chen, X. Zhang, K. Wu, H. Wang, J. Wang, and J. Chen, “Q-switched fiber laser based on transition metal dichalcogenides MoS2, MoSe2, WS2, and WSe2,” Opt. Express 23(20), 26723–26737 (2015).
[Crossref] [PubMed]

K. Wu, X. Zhang, J. Wang, X. Li, and J. Chen, “WS2 as a saturable absorber for ultrafast photonic applications of mode-locked and Q-switched lasers,” Opt. Express 23(9), 11453–11461 (2015).
[Crossref] [PubMed]

M. Zhang, G. H. Hu, G. Q. Hu, R. C. T. Howe, L. Chen, Z. Zheng, and T. Hasan, “Yb- and Er-doped fiber laser Q-switched with an optically uniform, broadband WS2 saturable absorber,” Sci. Rep. 5(1), 17482 (2015).
[Crossref] [PubMed]

R. I. Woodward, R. C. T. Howe, T. H. Runcorn, G. Hu, F. Torrisi, E. J. R. Kelleher, and T. Hasan, “Wideband saturable absorption in few-layer molybdenum diselenide (MoSe2) for Q-switching Yb-, Er- and Tm-doped fiber lasers,” Opt. Express 23(15), 20051–20061 (2015).
[Crossref] [PubMed]

S. H. Kassani, R. Khazaeizhad, H. Jeong, T. Nazari, D. I. Yeom, and K. Oh, “All-fiber Er-doped Q-Switched laser based on Tungsten Disulfide saturable absorber,” Opt. Mater. Express 5(2), 373–379 (2015).
[Crossref]

P. G. Yan, R. Y. Lin, S. C. Ruan, A. J. Liu, H. Chen, Y. Q. Zheng, S. F. Chen, C. Y. Guo, and J. G. Hu, “A practical topological insulator saturable absorber for mode-locked fiber laser,” Sci. Rep. 5(1), 8690 (2015).
[Crossref] [PubMed]

J. Bogusławski, G. Soboń, R. Zybala, K. Mars, A. Mikula, K. M. Abramski, and J. Sotor, “Investigation on pulse shaping in fiber laser hybrid mode-locked by Sb2Te3 saturable absorber,” Opt. Express 23(22), 29014–29023 (2015).
[Crossref] [PubMed]

X. T. Gan, C. Y. Zhao, Y. D. Wang, D. Mao, L. Fang, L. Han, and J. L. Zhao, “Graphene-assisted all-fiber phase shifter and switching,” Optica 2(5), 468–471 (2015).
[Crossref]

2014 (4)

X. Li, Y. Tang, Z. Yan, Y. Wang, B. Meng, G. Liang, H. Sun, X. Yu, Y. Zhang, X. Cheng, and Q. J. Wang, “Broadband Saturable Absorption of Graphene Oxide Thin Film and Its Application in Pulsed Fiber Lasers,” IEEE J. Sel. Top. Quantum Electron. 20, 1–7 (2014).

W. Li, B. G. Chen, C. Meng, W. Fang, Y. Xiao, X. Y. Li, Z. F. Hu, Y. X. Xu, L. M. Tong, H. Q. Wang, W. T. Liu, J. M. Bao, and Y. R. Shen, “Ultrafast All-Optical Graphene Modulator,” Nano Lett. 14(2), 955–959 (2014).
[Crossref] [PubMed]

J. Lee, J. Koo, Y.-M. Jhon, and J. H. Lee, “A femtosecond pulse erbium fiber laser incorporating a saturable absorber based on bulk-structured Bi2Te3 topological insulator,” Opt. Express 22(5), 6165–6173 (2014).
[Crossref] [PubMed]

K. Wang, Y. Feng, C. Chang, J. Zhan, C. Wang, Q. Zhao, J. N. Coleman, L. Zhang, W. J. Blau, and J. Wang, “Broadband ultrafast nonlinear absorption and nonlinear refraction of layered molybdenum dichalcogenide semiconductors,” Nanoscale 6(18), 10530–10535 (2014).
[Crossref] [PubMed]

2013 (4)

H. R. Gutierrez, N. Perea-Lopez, A. L. Elias, A. Berkdemir, B. Wang, R. Lv, F. Lopez-Urias, V. H. Crespi, H. Terrones, and M. Terrones, “Extraordinary Room-Temperature Photoluminescence in Triangular WS2 Monolayers,” Nano Lett. 13(8), 3447–3454 (2013).
[Crossref] [PubMed]

Z.-C. Luo, M. Liu, H. Liu, X.-W. Zheng, A.-P. Luo, C.-J. Zhao, H. Zhang, S.-C. Wen, and W.-C. Xu, “2 GHz passively harmonic mode-locked fiber laser by a microfiber-based topological insulator saturable absorber,” Opt. Lett. 38(24), 5212–5215 (2013).
[Crossref] [PubMed]

H. Yu, H. Zhang, Y. Wang, C. Zhao, B. Wang, S. Wen, H. Zhang, and J. Wang, “Topological insulator as an optical modulator for pulsed solid‐state lasers,” Laser Photonics Rev. 7(6), L77–L83 (2013).
[Crossref]

A. Martinez and Z. Sun, “Nanotube and graphene saturable absorbers for fibre lasers,” Nat. Photonics 7(11), 842–845 (2013).
[Crossref]

2012 (1)

S.-L. Li, H. Miyazaki, H. Song, H. Kuramochi, S. Nakaharai, and K. Tsukagoshi, “Quantitative Raman Spectrum and Reliable Thickness Identification for Atomic Layers on Insulating Substrates,” ACS Nano 6(8), 7381–7388 (2012).
[Crossref] [PubMed]

2011 (2)

M. Liu, X. Yin, E. Ulin-Avila, B. Geng, T. Zentgraf, L. Ju, F. Wang, and X. Zhang, “A graphene-based broadband optical modulator,” Nature 474(7349), 64–67 (2011).
[Crossref] [PubMed]

Q. Bao, H. Zhang, B. Wang, Z. Ni, C. H. Y. X. Lim, Y. Wang, D. Y. Tang, and K. P. Loh, “Broadband graphene polarizer,” Nat. Photonics 5(7), 411–415 (2011).
[Crossref]

2010 (2)

F. Bonaccorso, Z. Sun, T. Hasan, and A. C. Ferrari, “Graphene photonics and optoelectronics,” Nat. Photonics 4(9), 611–622 (2010).
[Crossref]

T. Mueller, F. Xia, and P. Avouris, “Graphene photodetectors for high-speed optical communications,” Nat. Photonics 4(5), 297–301 (2010).
[Crossref]

Abramski, K. M.

Avouris, P.

T. Mueller, F. Xia, and P. Avouris, “Graphene photodetectors for high-speed optical communications,” Nat. Photonics 4(5), 297–301 (2010).
[Crossref]

Bao, J. M.

W. Li, B. G. Chen, C. Meng, W. Fang, Y. Xiao, X. Y. Li, Z. F. Hu, Y. X. Xu, L. M. Tong, H. Q. Wang, W. T. Liu, J. M. Bao, and Y. R. Shen, “Ultrafast All-Optical Graphene Modulator,” Nano Lett. 14(2), 955–959 (2014).
[Crossref] [PubMed]

Bao, Q.

Q. Bao, H. Zhang, B. Wang, Z. Ni, C. H. Y. X. Lim, Y. Wang, D. Y. Tang, and K. P. Loh, “Broadband graphene polarizer,” Nat. Photonics 5(7), 411–415 (2011).
[Crossref]

Berkdemir, A.

H. R. Gutierrez, N. Perea-Lopez, A. L. Elias, A. Berkdemir, B. Wang, R. Lv, F. Lopez-Urias, V. H. Crespi, H. Terrones, and M. Terrones, “Extraordinary Room-Temperature Photoluminescence in Triangular WS2 Monolayers,” Nano Lett. 13(8), 3447–3454 (2013).
[Crossref] [PubMed]

Blau, W. J.

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W. S. Li, J. Peng, Y. L. Zhong, D. D. Wu, H. Y. Lin, Y. J. Cheng, Z. Q. Luo, J. Weng, H. Y. Xu, and Z. P. Cai, “Orange-light passively Q-switched Pr3+-doped all-fiber lasers with transition-metal dichalcogenide saturable absorbers,” Opt. Mater. Express 6(6), 2031–2039 (2016).
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K. Wang, Y. Feng, C. Chang, J. Zhan, C. Wang, Q. Zhao, J. N. Coleman, L. Zhang, W. J. Blau, and J. Wang, “Broadband ultrafast nonlinear absorption and nonlinear refraction of layered molybdenum dichalcogenide semiconductors,” Nanoscale 6(18), 10530–10535 (2014).
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F. Bonaccorso, Z. Sun, T. Hasan, and A. C. Ferrari, “Graphene photonics and optoelectronics,” Nat. Photonics 4(9), 611–622 (2010).
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J. F. Li, H. Y. Luo, B. Zhai, R. G. Lu, Z. N. Guo, H. Zhang, and Y. Liu, “Black phosphorus: a two-dimension saturable absorption material for mid-infrared Q-switched and mode-locked fiber lasers,” Sci. Rep. 6(1), 30361 (2016).
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Hasan, T.

M. Zhang, G. H. Hu, G. Q. Hu, R. C. T. Howe, L. Chen, Z. Zheng, and T. Hasan, “Yb- and Er-doped fiber laser Q-switched with an optically uniform, broadband WS2 saturable absorber,” Sci. Rep. 5(1), 17482 (2015).
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F. Bonaccorso, Z. Sun, T. Hasan, and A. C. Ferrari, “Graphene photonics and optoelectronics,” Nat. Photonics 4(9), 611–622 (2010).
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M. Zhang, G. H. Hu, G. Q. Hu, R. C. T. Howe, L. Chen, Z. Zheng, and T. Hasan, “Yb- and Er-doped fiber laser Q-switched with an optically uniform, broadband WS2 saturable absorber,” Sci. Rep. 5(1), 17482 (2015).
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R. I. Woodward, R. C. T. Howe, T. H. Runcorn, G. Hu, F. Torrisi, E. J. R. Kelleher, and T. Hasan, “Wideband saturable absorption in few-layer molybdenum diselenide (MoSe2) for Q-switching Yb-, Er- and Tm-doped fiber lasers,” Opt. Express 23(15), 20051–20061 (2015).
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M. Zhang, G. H. Hu, G. Q. Hu, R. C. T. Howe, L. Chen, Z. Zheng, and T. Hasan, “Yb- and Er-doped fiber laser Q-switched with an optically uniform, broadband WS2 saturable absorber,” Sci. Rep. 5(1), 17482 (2015).
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P. G. Yan, R. Y. Lin, S. C. Ruan, A. J. Liu, H. Chen, Y. Q. Zheng, S. F. Chen, C. Y. Guo, and J. G. Hu, “A practical topological insulator saturable absorber for mode-locked fiber laser,” Sci. Rep. 5(1), 8690 (2015).
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W. Li, B. G. Chen, C. Meng, W. Fang, Y. Xiao, X. Y. Li, Z. F. Hu, Y. X. Xu, L. M. Tong, H. Q. Wang, W. T. Liu, J. M. Bao, and Y. R. Shen, “Ultrafast All-Optical Graphene Modulator,” Nano Lett. 14(2), 955–959 (2014).
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D. Mao, X. Y. She, B. B. Du, D. X. Yang, W. D. Zhang, K. Song, X. Q. Cui, B. Q. Jiang, T. Peng, and J. L. Zhao, “Erbium-doped fiber laser passively mode locked with few-layer WSe2/MoSe2 nanosheets,” Sci. Rep. 6(1), 23583 (2016).
[Crossref] [PubMed]

Jiang, X. F.

Ju, L.

M. Liu, X. Yin, E. Ulin-Avila, B. Geng, T. Zentgraf, L. Ju, F. Wang, and X. Zhang, “A graphene-based broadband optical modulator,” Nature 474(7349), 64–67 (2011).
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Kassani, S. H.

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L. C. Kong, Z. P. Qin, G. Q. Xie, Z. N. Guo, H. Zhang, P. Yuan, and L. J. Qian, “Black phosphorus as broadband saturable absorber for pulsed lasers from 1 mu mu m to 2.7 mu m wavelength,” Laser Phys. Lett. 13(4), 045801 (2016).
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Kuramochi, H.

S.-L. Li, H. Miyazaki, H. Song, H. Kuramochi, S. Nakaharai, and K. Tsukagoshi, “Quantitative Raman Spectrum and Reliable Thickness Identification for Atomic Layers on Insulating Substrates,” ACS Nano 6(8), 7381–7388 (2012).
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J. F. Li, H. Y. Luo, B. Zhai, R. G. Lu, Z. N. Guo, H. Zhang, and Y. Liu, “Black phosphorus: a two-dimension saturable absorption material for mid-infrared Q-switched and mode-locked fiber lasers,” Sci. Rep. 6(1), 30361 (2016).
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S.-L. Li, H. Miyazaki, H. Song, H. Kuramochi, S. Nakaharai, and K. Tsukagoshi, “Quantitative Raman Spectrum and Reliable Thickness Identification for Atomic Layers on Insulating Substrates,” ACS Nano 6(8), 7381–7388 (2012).
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W. Li, B. G. Chen, C. Meng, W. Fang, Y. Xiao, X. Y. Li, Z. F. Hu, Y. X. Xu, L. M. Tong, H. Q. Wang, W. T. Liu, J. M. Bao, and Y. R. Shen, “Ultrafast All-Optical Graphene Modulator,” Nano Lett. 14(2), 955–959 (2014).
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Li, X.

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Li, X. Y.

W. Li, B. G. Chen, C. Meng, W. Fang, Y. Xiao, X. Y. Li, Z. F. Hu, Y. X. Xu, L. M. Tong, H. Q. Wang, W. T. Liu, J. M. Bao, and Y. R. Shen, “Ultrafast All-Optical Graphene Modulator,” Nano Lett. 14(2), 955–959 (2014).
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Q. Bao, H. Zhang, B. Wang, Z. Ni, C. H. Y. X. Lim, Y. Wang, D. Y. Tang, and K. P. Loh, “Broadband graphene polarizer,” Nat. Photonics 5(7), 411–415 (2011).
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Lin, R. Y.

P. G. Yan, R. Y. Lin, S. C. Ruan, A. J. Liu, H. Chen, Y. Q. Zheng, S. F. Chen, C. Y. Guo, and J. G. Hu, “A practical topological insulator saturable absorber for mode-locked fiber laser,” Sci. Rep. 5(1), 8690 (2015).
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Liu, A. J.

P. G. Yan, R. Y. Lin, S. C. Ruan, A. J. Liu, H. Chen, Y. Q. Zheng, S. F. Chen, C. Y. Guo, and J. G. Hu, “A practical topological insulator saturable absorber for mode-locked fiber laser,” Sci. Rep. 5(1), 8690 (2015).
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Liu, M.

Liu, S.

H. Wang, B. H. Chen, X. Y. Zhang, S. Liu, B. Q. Zhu, J. Wang, K. Wu, and J. P. Chen, “Ethanol catalytic deposition of MoS2 on tapered fiber,” Photonics Research 3(3), A102–A107 (2015).
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Liu, W. T.

S. L. Yu, X. Q. Wu, K. R. Chen, B. G. Chen, X. Guo, D. X. Dai, L. M. Tong, W. T. Liu, and Y. R. Shen, “All-optical graphene modulator based on optical Kerr phase shift,” Optica 3(5), 541–544 (2016).
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W. Li, B. G. Chen, C. Meng, W. Fang, Y. Xiao, X. Y. Li, Z. F. Hu, Y. X. Xu, L. M. Tong, H. Q. Wang, W. T. Liu, J. M. Bao, and Y. R. Shen, “Ultrafast All-Optical Graphene Modulator,” Nano Lett. 14(2), 955–959 (2014).
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J. F. Li, H. Y. Luo, B. Zhai, R. G. Lu, Z. N. Guo, H. Zhang, and Y. Liu, “Black phosphorus: a two-dimension saturable absorption material for mid-infrared Q-switched and mode-locked fiber lasers,” Sci. Rep. 6(1), 30361 (2016).
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Q. Bao, H. Zhang, B. Wang, Z. Ni, C. H. Y. X. Lim, Y. Wang, D. Y. Tang, and K. P. Loh, “Broadband graphene polarizer,” Nat. Photonics 5(7), 411–415 (2011).
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H. R. Gutierrez, N. Perea-Lopez, A. L. Elias, A. Berkdemir, B. Wang, R. Lv, F. Lopez-Urias, V. H. Crespi, H. Terrones, and M. Terrones, “Extraordinary Room-Temperature Photoluminescence in Triangular WS2 Monolayers,” Nano Lett. 13(8), 3447–3454 (2013).
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J. F. Li, H. Y. Luo, B. Zhai, R. G. Lu, Z. N. Guo, H. Zhang, and Y. Liu, “Black phosphorus: a two-dimension saturable absorption material for mid-infrared Q-switched and mode-locked fiber lasers,” Sci. Rep. 6(1), 30361 (2016).
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Z. N. Guo, H. Zhang, S. B. Lu, Z. T. Wang, S. Y. Tang, J. D. Shao, Z. B. Sun, H. H. Xie, H. Y. Wang, X. F. Yu, and P. K. Chu, “From Black Phosphorus to Phosphorene: Basic Solvent Exfoliation, Evolution of Raman Scattering, and Applications to Ultrafast Photonics,” Adv. Funct. Mater. 25(45), 6996–7002 (2015).
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Luo, A.-P.

Luo, H. Y.

J. F. Li, H. Y. Luo, B. Zhai, R. G. Lu, Z. N. Guo, H. Zhang, and Y. Liu, “Black phosphorus: a two-dimension saturable absorption material for mid-infrared Q-switched and mode-locked fiber lasers,” Sci. Rep. 6(1), 30361 (2016).
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Luo, Z. Q.

W. S. Li, J. Peng, Y. L. Zhong, D. D. Wu, H. Y. Lin, Y. J. Cheng, Z. Q. Luo, J. Weng, H. Y. Xu, and Z. P. Cai, “Orange-light passively Q-switched Pr3+-doped all-fiber lasers with transition-metal dichalcogenide saturable absorbers,” Opt. Mater. Express 6(6), 2031–2039 (2016).
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H. R. Gutierrez, N. Perea-Lopez, A. L. Elias, A. Berkdemir, B. Wang, R. Lv, F. Lopez-Urias, V. H. Crespi, H. Terrones, and M. Terrones, “Extraordinary Room-Temperature Photoluminescence in Triangular WS2 Monolayers,” Nano Lett. 13(8), 3447–3454 (2013).
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D. Mao, X. Y. She, B. B. Du, D. X. Yang, W. D. Zhang, K. Song, X. Q. Cui, B. Q. Jiang, T. Peng, and J. L. Zhao, “Erbium-doped fiber laser passively mode locked with few-layer WSe2/MoSe2 nanosheets,” Sci. Rep. 6(1), 23583 (2016).
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Meng, C.

W. Li, B. G. Chen, C. Meng, W. Fang, Y. Xiao, X. Y. Li, Z. F. Hu, Y. X. Xu, L. M. Tong, H. Q. Wang, W. T. Liu, J. M. Bao, and Y. R. Shen, “Ultrafast All-Optical Graphene Modulator,” Nano Lett. 14(2), 955–959 (2014).
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Mikula, A.

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S.-L. Li, H. Miyazaki, H. Song, H. Kuramochi, S. Nakaharai, and K. Tsukagoshi, “Quantitative Raman Spectrum and Reliable Thickness Identification for Atomic Layers on Insulating Substrates,” ACS Nano 6(8), 7381–7388 (2012).
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Ni, Z.

Q. Bao, H. Zhang, B. Wang, Z. Ni, C. H. Y. X. Lim, Y. Wang, D. Y. Tang, and K. P. Loh, “Broadband graphene polarizer,” Nat. Photonics 5(7), 411–415 (2011).
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Park, J.

Peng, J.

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Z. C. Luo, M. Liu, Z. N. Guo, X. F. Jiang, A. P. Luo, C. J. Zhao, X. F. Yu, W. C. Xu, and H. Zhang, “Microfiber-based few-layer black phosphorus saturable absorber for ultra-fast fiber laser,” Opt. Express 23(15), 20030–20039 (2015).
[Crossref] [PubMed]

S. B. Lu, L. L. Miao, Z. N. Guo, X. Qi, C. J. Zhao, H. Zhang, S. C. Wen, D. Y. Tang, and D. Y. Fan, “Broadband nonlinear optical response in multi-layer black phosphorus: an emerging infrared and mid-infrared optical material,” Opt. Express 23(9), 11183–11194 (2015).
[Crossref] [PubMed]

Z. N. Guo, H. Zhang, S. B. Lu, Z. T. Wang, S. Y. Tang, J. D. Shao, Z. B. Sun, H. H. Xie, H. Y. Wang, X. F. Yu, and P. K. Chu, “From Black Phosphorus to Phosphorene: Basic Solvent Exfoliation, Evolution of Raman Scattering, and Applications to Ultrafast Photonics,” Adv. Funct. Mater. 25(45), 6996–7002 (2015).
[Crossref]

H. Yu, H. Zhang, Y. Wang, C. Zhao, B. Wang, S. Wen, H. Zhang, and J. Wang, “Topological insulator as an optical modulator for pulsed solid‐state lasers,” Laser Photonics Rev. 7(6), L77–L83 (2013).
[Crossref]

H. Yu, H. Zhang, Y. Wang, C. Zhao, B. Wang, S. Wen, H. Zhang, and J. Wang, “Topological insulator as an optical modulator for pulsed solid‐state lasers,” Laser Photonics Rev. 7(6), L77–L83 (2013).
[Crossref]

Z.-C. Luo, M. Liu, H. Liu, X.-W. Zheng, A.-P. Luo, C.-J. Zhao, H. Zhang, S.-C. Wen, and W.-C. Xu, “2 GHz passively harmonic mode-locked fiber laser by a microfiber-based topological insulator saturable absorber,” Opt. Lett. 38(24), 5212–5215 (2013).
[Crossref] [PubMed]

Q. Bao, H. Zhang, B. Wang, Z. Ni, C. H. Y. X. Lim, Y. Wang, D. Y. Tang, and K. P. Loh, “Broadband graphene polarizer,” Nat. Photonics 5(7), 411–415 (2011).
[Crossref]

Zhang, L.

K. Wang, Y. Feng, C. Chang, J. Zhan, C. Wang, Q. Zhao, J. N. Coleman, L. Zhang, W. J. Blau, and J. Wang, “Broadband ultrafast nonlinear absorption and nonlinear refraction of layered molybdenum dichalcogenide semiconductors,” Nanoscale 6(18), 10530–10535 (2014).
[Crossref] [PubMed]

Zhang, M.

M. Zhang, G. H. Hu, G. Q. Hu, R. C. T. Howe, L. Chen, Z. Zheng, and T. Hasan, “Yb- and Er-doped fiber laser Q-switched with an optically uniform, broadband WS2 saturable absorber,” Sci. Rep. 5(1), 17482 (2015).
[Crossref] [PubMed]

Zhang, W. D.

D. Mao, X. Y. She, B. B. Du, D. X. Yang, W. D. Zhang, K. Song, X. Q. Cui, B. Q. Jiang, T. Peng, and J. L. Zhao, “Erbium-doped fiber laser passively mode locked with few-layer WSe2/MoSe2 nanosheets,” Sci. Rep. 6(1), 23583 (2016).
[Crossref] [PubMed]

Zhang, X.

Zhang, X. Y.

H. Wang, B. H. Chen, X. Y. Zhang, S. Liu, B. Q. Zhu, J. Wang, K. Wu, and J. P. Chen, “Ethanol catalytic deposition of MoS2 on tapered fiber,” Photonics Research 3(3), A102–A107 (2015).
[Crossref]

Zhang, Y.

X. Li, Y. Tang, Z. Yan, Y. Wang, B. Meng, G. Liang, H. Sun, X. Yu, Y. Zhang, X. Cheng, and Q. J. Wang, “Broadband Saturable Absorption of Graphene Oxide Thin Film and Its Application in Pulsed Fiber Lasers,” IEEE J. Sel. Top. Quantum Electron. 20, 1–7 (2014).

Zhao, C.

H. Yu, H. Zhang, Y. Wang, C. Zhao, B. Wang, S. Wen, H. Zhang, and J. Wang, “Topological insulator as an optical modulator for pulsed solid‐state lasers,” Laser Photonics Rev. 7(6), L77–L83 (2013).
[Crossref]

Zhao, C. J.

Zhao, C. Y.

Zhao, C.-J.

Zhao, J. L.

D. Mao, X. Y. She, B. B. Du, D. X. Yang, W. D. Zhang, K. Song, X. Q. Cui, B. Q. Jiang, T. Peng, and J. L. Zhao, “Erbium-doped fiber laser passively mode locked with few-layer WSe2/MoSe2 nanosheets,” Sci. Rep. 6(1), 23583 (2016).
[Crossref] [PubMed]

X. T. Gan, C. Y. Zhao, Y. D. Wang, D. Mao, L. Fang, L. Han, and J. L. Zhao, “Graphene-assisted all-fiber phase shifter and switching,” Optica 2(5), 468–471 (2015).
[Crossref]

Zhao, Q.

K. Wang, Y. Feng, C. Chang, J. Zhan, C. Wang, Q. Zhao, J. N. Coleman, L. Zhang, W. J. Blau, and J. Wang, “Broadband ultrafast nonlinear absorption and nonlinear refraction of layered molybdenum dichalcogenide semiconductors,” Nanoscale 6(18), 10530–10535 (2014).
[Crossref] [PubMed]

Zheng, X.-W.

Zheng, Y. Q.

P. G. Yan, R. Y. Lin, S. C. Ruan, A. J. Liu, H. Chen, Y. Q. Zheng, S. F. Chen, C. Y. Guo, and J. G. Hu, “A practical topological insulator saturable absorber for mode-locked fiber laser,” Sci. Rep. 5(1), 8690 (2015).
[Crossref] [PubMed]

Zheng, Z.

M. Zhang, G. H. Hu, G. Q. Hu, R. C. T. Howe, L. Chen, Z. Zheng, and T. Hasan, “Yb- and Er-doped fiber laser Q-switched with an optically uniform, broadband WS2 saturable absorber,” Sci. Rep. 5(1), 17482 (2015).
[Crossref] [PubMed]

Zhong, Y. L.

Zhu, B. Q.

H. Wang, B. H. Chen, X. Y. Zhang, S. Liu, B. Q. Zhu, J. Wang, K. Wu, and J. P. Chen, “Ethanol catalytic deposition of MoS2 on tapered fiber,” Photonics Research 3(3), A102–A107 (2015).
[Crossref]

Zhu, C. H.

Z. Q. Luo, D. D. Wu, B. Xu, H. Y. Xu, Z. P. Cai, J. Peng, J. Weng, S. Xu, C. H. Zhu, F. Q. Wang, Z. P. Sun, and H. Zhang, “Two-dimensional material-based saturable absorbers: towards compact visible-wavelength all-fiber pulsed lasers,” Nanoscale 8(2), 1066–1072 (2016).
[Crossref] [PubMed]

Zybala, R.

ACS Nano (1)

S.-L. Li, H. Miyazaki, H. Song, H. Kuramochi, S. Nakaharai, and K. Tsukagoshi, “Quantitative Raman Spectrum and Reliable Thickness Identification for Atomic Layers on Insulating Substrates,” ACS Nano 6(8), 7381–7388 (2012).
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Adv. Funct. Mater. (1)

Z. N. Guo, H. Zhang, S. B. Lu, Z. T. Wang, S. Y. Tang, J. D. Shao, Z. B. Sun, H. H. Xie, H. Y. Wang, X. F. Yu, and P. K. Chu, “From Black Phosphorus to Phosphorene: Basic Solvent Exfoliation, Evolution of Raman Scattering, and Applications to Ultrafast Photonics,” Adv. Funct. Mater. 25(45), 6996–7002 (2015).
[Crossref]

IEEE J. Sel. Top. Quantum Electron. (1)

X. Li, Y. Tang, Z. Yan, Y. Wang, B. Meng, G. Liang, H. Sun, X. Yu, Y. Zhang, X. Cheng, and Q. J. Wang, “Broadband Saturable Absorption of Graphene Oxide Thin Film and Its Application in Pulsed Fiber Lasers,” IEEE J. Sel. Top. Quantum Electron. 20, 1–7 (2014).

Laser Photonics Rev. (1)

H. Yu, H. Zhang, Y. Wang, C. Zhao, B. Wang, S. Wen, H. Zhang, and J. Wang, “Topological insulator as an optical modulator for pulsed solid‐state lasers,” Laser Photonics Rev. 7(6), L77–L83 (2013).
[Crossref]

Laser Phys. Lett. (1)

L. C. Kong, Z. P. Qin, G. Q. Xie, Z. N. Guo, H. Zhang, P. Yuan, and L. J. Qian, “Black phosphorus as broadband saturable absorber for pulsed lasers from 1 mu mu m to 2.7 mu m wavelength,” Laser Phys. Lett. 13(4), 045801 (2016).
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Nano Lett. (2)

H. R. Gutierrez, N. Perea-Lopez, A. L. Elias, A. Berkdemir, B. Wang, R. Lv, F. Lopez-Urias, V. H. Crespi, H. Terrones, and M. Terrones, “Extraordinary Room-Temperature Photoluminescence in Triangular WS2 Monolayers,” Nano Lett. 13(8), 3447–3454 (2013).
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W. Li, B. G. Chen, C. Meng, W. Fang, Y. Xiao, X. Y. Li, Z. F. Hu, Y. X. Xu, L. M. Tong, H. Q. Wang, W. T. Liu, J. M. Bao, and Y. R. Shen, “Ultrafast All-Optical Graphene Modulator,” Nano Lett. 14(2), 955–959 (2014).
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Nanoscale (2)

Z. Q. Luo, D. D. Wu, B. Xu, H. Y. Xu, Z. P. Cai, J. Peng, J. Weng, S. Xu, C. H. Zhu, F. Q. Wang, Z. P. Sun, and H. Zhang, “Two-dimensional material-based saturable absorbers: towards compact visible-wavelength all-fiber pulsed lasers,” Nanoscale 8(2), 1066–1072 (2016).
[Crossref] [PubMed]

K. Wang, Y. Feng, C. Chang, J. Zhan, C. Wang, Q. Zhao, J. N. Coleman, L. Zhang, W. J. Blau, and J. Wang, “Broadband ultrafast nonlinear absorption and nonlinear refraction of layered molybdenum dichalcogenide semiconductors,” Nanoscale 6(18), 10530–10535 (2014).
[Crossref] [PubMed]

Nat. Photonics (4)

Q. Bao, H. Zhang, B. Wang, Z. Ni, C. H. Y. X. Lim, Y. Wang, D. Y. Tang, and K. P. Loh, “Broadband graphene polarizer,” Nat. Photonics 5(7), 411–415 (2011).
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F. Bonaccorso, Z. Sun, T. Hasan, and A. C. Ferrari, “Graphene photonics and optoelectronics,” Nat. Photonics 4(9), 611–622 (2010).
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A. Martinez and Z. Sun, “Nanotube and graphene saturable absorbers for fibre lasers,” Nat. Photonics 7(11), 842–845 (2013).
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Nature (1)

M. Liu, X. Yin, E. Ulin-Avila, B. Geng, T. Zentgraf, L. Ju, F. Wang, and X. Zhang, “A graphene-based broadband optical modulator,” Nature 474(7349), 64–67 (2011).
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Opt. Express (9)

B. Chen, X. Zhang, K. Wu, H. Wang, J. Wang, and J. Chen, “Q-switched fiber laser based on transition metal dichalcogenides MoS2, MoSe2, WS2, and WSe2,” Opt. Express 23(20), 26723–26737 (2015).
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K. Wu, X. Zhang, J. Wang, X. Li, and J. Chen, “WS2 as a saturable absorber for ultrafast photonic applications of mode-locked and Q-switched lasers,” Opt. Express 23(9), 11453–11461 (2015).
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J. Bogusławski, G. Soboń, R. Zybala, K. Mars, A. Mikula, K. M. Abramski, and J. Sotor, “Investigation on pulse shaping in fiber laser hybrid mode-locked by Sb2Te3 saturable absorber,” Opt. Express 23(22), 29014–29023 (2015).
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J. Lee, J. Koo, Y.-M. Jhon, and J. H. Lee, “A femtosecond pulse erbium fiber laser incorporating a saturable absorber based on bulk-structured Bi2Te3 topological insulator,” Opt. Express 22(5), 6165–6173 (2014).
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H. Chen, Y. Chen, J. Yin, X. Zhang, T. Guo, and P. Yan, “High-damage-resistant tungsten disulfide saturable absorber mirror for passively Q-switched fiber laser,” Opt. Express 24(15), 16287–16296 (2016).
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M. Jung, J. Lee, J. Park, J. Koo, Y. M. Jhon, and J. H. Lee, “Mode-locked, 1.94-mu, all-fiberized laser using WS2 based evanescent field interaction,” Opt. Express 23(15), 19996–20006 (2015).
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Z. C. Luo, M. Liu, Z. N. Guo, X. F. Jiang, A. P. Luo, C. J. Zhao, X. F. Yu, W. C. Xu, and H. Zhang, “Microfiber-based few-layer black phosphorus saturable absorber for ultra-fast fiber laser,” Opt. Express 23(15), 20030–20039 (2015).
[Crossref] [PubMed]

S. B. Lu, L. L. Miao, Z. N. Guo, X. Qi, C. J. Zhao, H. Zhang, S. C. Wen, D. Y. Tang, and D. Y. Fan, “Broadband nonlinear optical response in multi-layer black phosphorus: an emerging infrared and mid-infrared optical material,” Opt. Express 23(9), 11183–11194 (2015).
[Crossref] [PubMed]

R. I. Woodward, R. C. T. Howe, T. H. Runcorn, G. Hu, F. Torrisi, E. J. R. Kelleher, and T. Hasan, “Wideband saturable absorption in few-layer molybdenum diselenide (MoSe2) for Q-switching Yb-, Er- and Tm-doped fiber lasers,” Opt. Express 23(15), 20051–20061 (2015).
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Opt. Lett. (1)

Opt. Mater. Express (3)

Optica (2)

Photonics Research (1)

H. Wang, B. H. Chen, X. Y. Zhang, S. Liu, B. Q. Zhu, J. Wang, K. Wu, and J. P. Chen, “Ethanol catalytic deposition of MoS2 on tapered fiber,” Photonics Research 3(3), A102–A107 (2015).
[Crossref]

Sci. Rep. (4)

D. Mao, X. Y. She, B. B. Du, D. X. Yang, W. D. Zhang, K. Song, X. Q. Cui, B. Q. Jiang, T. Peng, and J. L. Zhao, “Erbium-doped fiber laser passively mode locked with few-layer WSe2/MoSe2 nanosheets,” Sci. Rep. 6(1), 23583 (2016).
[Crossref] [PubMed]

J. F. Li, H. Y. Luo, B. Zhai, R. G. Lu, Z. N. Guo, H. Zhang, and Y. Liu, “Black phosphorus: a two-dimension saturable absorption material for mid-infrared Q-switched and mode-locked fiber lasers,” Sci. Rep. 6(1), 30361 (2016).
[Crossref] [PubMed]

P. G. Yan, R. Y. Lin, S. C. Ruan, A. J. Liu, H. Chen, Y. Q. Zheng, S. F. Chen, C. Y. Guo, and J. G. Hu, “A practical topological insulator saturable absorber for mode-locked fiber laser,” Sci. Rep. 5(1), 8690 (2015).
[Crossref] [PubMed]

M. Zhang, G. H. Hu, G. Q. Hu, R. C. T. Howe, L. Chen, Z. Zheng, and T. Hasan, “Yb- and Er-doped fiber laser Q-switched with an optically uniform, broadband WS2 saturable absorber,” Sci. Rep. 5(1), 17482 (2015).
[Crossref] [PubMed]

Supplementary Material (1)

NameDescription
» Visualization 1       Spectrum shift when pump applied

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Figures (7)

Fig. 1
Fig. 1 (a) TEM image of WS2 nanosheets in the dispersions, (b) Raman spectrum of WS2 deposited on tapered fiber, (c) microscopic and (d) SEM images of WS2 deposited tapered fiber.
Fig. 2
Fig. 2 Experimental setup of the all-optical phase shifter and switch based on WS2 deposited tapered fiber.
Fig. 3
Fig. 3 Transmission spectra of the MZI with 0 (blue) and 5π phase shift (red) using (a) a continuous wave laser source and (b) a mode-locked laser source (see Visualization 1). (c) Phase shift with respect to the injected pump power with two input power levels.
Fig. 4
Fig. 4 (a) Pulsed pump light (yellow) and switch output at “output 1” port (blue), (b) a zoomed view of a single off-on-off transition of the switch (blue) and exponential fit (red), (c) complementary output at “output 2” port, and (d) output breaking when the MZI is over-driven.
Fig. 5
Fig. 5 Sine wave waveforms of (a) pump and (b) switch output with a repetition rate of 10 Hz, and (c) frequency response of the switch.
Fig. 6
Fig. 6 Mode distribution of (a) 980 nm light and (b) 1550 nm light, and (c) mode distribution in the middle line.
Fig. 7
Fig. 7 (a) Refractive index of WS2 and (b) difference of refractive index under different temperature.

Tables (2)

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Table 1 Comparison among all-optical devices based on 2D materials and other nonlinear materials

Tables Icon

Table 2 Comparison between our work and graphene based device

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