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Early Posting

Accepted papers to appear in an upcoming issue

OSA now posts prepublication articles as soon as they are accepted and cleared for production. See the FAQ for additional information.

Dispersion tailoring of a crystalline whispering gallery mode microcavity for wide-spanning optical Kerr frequency comb

Takasumi Tanabe, Yosuke Nakagawa, Yuta Mizumoto, Takumi Kato, Tomoya Kobatake, Hiroki Itobe, and Yasuhiro Kakinuma

Doc ID: 267057 Received 25 May 2016; Accepted 26 Jul 2016; Posted 26 Jul 2016  View: PDF

Abstract: We fabricated a crystalline whispering gallery mode microcavity by using a computer-controlled ultra-precision cutting process to control the cavity cross-section. We used a numerical simulation to show that a wide-spanning optical Kerr frequency comb is generated by tailoring the dispersion of a crystalline whispering gallery mode microcavity. To control the dispersion, we designed the cross-sectional shape of the device and fabricated it by using ultra-precision cutting. Both the measured value and the numerical result show that the microcavity has an anomalous dispersion over one octave.

Light-induced thermal convection for size-based microparticles sorting

Yu Zhang, Zhihai Liu, Jiaojie Lei, xiaoyun tang, Yaxun Zhang, Enming Zhao, Jun Yang, and Libo Yuan

Doc ID: 264418 Received 02 May 2016; Accepted 22 Jul 2016; Posted 26 Jul 2016  View: PDF

Abstract: Separating and sorting of micrometer-sized particles in liquids are important subjects in current analytical chemistry, colloidal chemistry, environmental chemistry, and biological technology. In this paper, we propose and demonstrate microparticles separating and sorting method based on the light induced thermal convection effect. The thermal convection generated as a result of the frequency dependent absorption of optical energy plays an important role in the microparticles trapping and manipulation. By using the light induced thermal convection, we can separate and sort the microparticles of different sizes. The manipulation of the microparticles sorting is non-contact and without laser irradiation directly, which contribute to reducing the mechanical damages and irradiated injuries. In addition to, compared with the traditional sorting methods, the microparticles sorting method based on the light induced thermal convection effect is much simple to fabricate, easy to implement and convenient to manipulate. This possibility adds light induced thermal convection effect as an additional degree of freedom to microparticles separating and sorting.

A certification scheme for the boson sampler

Kai Liu, Austin Lund, Yong-jian Gu, and Timothy Ralph

Doc ID: 261698 Received 13 Apr 2016; Accepted 22 Jul 2016; Posted 22 Jul 2016  View: PDF

Abstract: Boson sampling can provide strong evidence that the computational power of a quantum computer outperforms a classical one via currently feasible linear optics experiments. However, how to identify an actual boson sampling device against any classical computing imposters is an ambiguous problem due to the computational complexity class in which boson sampling lies. The certification protocol based on bosonic bunching fails to rule out the so-called mean-field sampling. We propose a certification scheme to distinguish the boson sampling from the mean-field sampling for any random scattering matrices chosen via the Harr-measure. We numerically analyze our scheme and the influence of imperfect input states caused by non-simultaneous arrival photons.

New features of the three-phonon acousto-optical interaction due to elastic waves of finite amplitude and an advanced spectrum analysis of optical signals

Adan Omar Arellanes Bernabe and Alexandre Shcherbakov

Doc ID: 264263 Received 28 Apr 2016; Accepted 22 Jul 2016; Posted 22 Jul 2016  View: PDF

Abstract: The unexpected features of square-law nonlinearity inherent in the non-collinear three-phonon acousto-optical interaction controlled by elastic waves of finite amplitude in birefringent crystals with linear acoustic attenuation are distinguished and investigated. They lead to breakthrough applications of strongly nonlinear three-phonon interaction to linear optical spectrum analysis with ~100% efficiency and qualitatively improved resolution. Principally new physical degree of freedom, unique for this nonlinear phenomenon, is revealed and characterized. The indispensable theoretical developments and proof-of-principle acousto-optical experiments with specially designed wide-aperture tellurium dioxide cell are presented. The obtained experimental results confirm the elaborated approaches promising potentially the highest possible spectral resolution that one can expect in principle from acousto-optical technique within optical spectrum analysis.

Quantum and thermal noise limits of coupled resonators optical waveguide and resonant waveguide optical rotation sensors

Jacob Scheuer

Doc ID: 264796 Received 09 May 2016; Accepted 22 Jul 2016; Posted 22 Jul 2016  View: PDF

Abstract: We analyze theoretically the performance limitations of coupled resonator optical waveguides (CROWs) and a single passive resonator of the same area for rotation sensing applications. We show that when the dominant noise sources are of quantum (shot) or thermal origin, the single passive resonator outperforms the CROW regardless the propagation loss in the waveguides. We also show that optimizing the design parameters of the CROW and the single ring cavity according to the dominant noise source can improve the minimal detectable rotation rate by almost 50%.

Two Tunneling Coupled Two-Level Systems with Broken Inversion Symmetry‎: ‎Tuning the Terahetrz Emission

MirFaez Miri, Farhad Zamani, and Hamideh Alipoor

Doc ID: 267777 Received 06 Jun 2016; Accepted 20 Jul 2016; Posted 26 Jul 2016  View: PDF

Abstract: ‎Exposed to a strong electromagnetic field‎, ‎a two-level system with broken inversion symmetry radiates at the‎‎Rabi frequency $\Omega_R$‎. ‎This can be used to generate terahertz waves [O‎. ‎V‎. ‎Kibis {\it et al.}‎, ‎Phys‎. ‎Rev‎. ‎Lett‎. ‎{\bf 102}‎, ‎0 601 (2009)]‎. ‎We show that a system composed of two tunneling coupled asymmetric two-level systems‎, ‎radiates‎ ‎at frequency $\sqrt{(\xi_1-\xi_2)^2+\Omega_R^2}$‎, ‎where energies $\hbar \xi_1$ and $\hbar\xi_2$ characterize the tunneling interaction‎. ‎This opens the possibility of tuning the terahertz spectrum in a considerable range‎.‎We also show that for particular amplitudes of the driving field‎, ‎the emission at frequency $\sqrt{(\xi_1-\xi_2)^2+\Omega_R^2}$ is suppressed‎.

Diffusive to quasi-ballistic random laser: incoherent and coherent models

William Guerin, Yidong Chong, Quentin Baudouin, Robin Kaiser, matthias liertzer, and Stefan Rotter

Doc ID: 268155 Received 13 Jun 2016; Accepted 20 Jul 2016; Posted 21 Jul 2016  View: PDF

Abstract: We study the crossover between the diffusive and quasi-ballistic regimes of random lasers. In particular, we compare incoherent models based on the diffusion equation and the radiative transfer equation (RTE), which neglect all wave effects, with a coherent wave model for the random laser threshold. We show that both the incoherent and the coherent models predict qualitatively similar thresholds, with a smooth transition from a diffuse to a quasi-ballistic regime. The shape of the intensity distribution in the sample as predicted by the RTE model at threshold is also in good agreement with the coherent model. The approximate incoherent models thus provide useful analytical predictions for the threshold of random lasers as well as the shape of the random laser modes at threshold.

Electromagnetic wave reshaping devices designed by optical surface transformation

Sun Fei, Sailing He, and Shu Guo

Doc ID: 267249 Received 27 May 2016; Accepted 18 Jul 2016; Posted 26 Jul 2016  View: PDF

Abstract: Optical surface transformation (OST) is a novel theory derived from transformation optics (TO). No mathematical calculations are required during the optical designing process with OST, making it a much more convenient tool for optical engineers. In this study, we focus on how to reshape the field intensity distribution on the wave front of the incident beam and produce special optical beams (e.g., asymmetric Gaussian beams, hollow beams, and zeros-order Bessel beams) using OST. Numerical simulations are given to verify the performance of the proposed devices.

An analytical study of mismatched complementary media

Lin Zhu, Xudong Luo, and Hongru Ma

Doc ID: 262067 Received 01 Apr 2016; Accepted 18 Jul 2016; Posted 21 Jul 2016  View: PDF

Abstract: Complementary media (CM) interacting with arbitrarily situated obstacles are usually less discussed. In this paper, an analytical framework based on multiple scattering theory is established for analyzing such a mismatched case. As examples, CM-based devices, i.e., a superlens and superscatterer, are discussed. From an analysis, the cancellation mechanism of the mismatched CM is studied. In addition, numerical results are provided for illustration. Moreover, further study shows that such cancellation effects might rely on specific conditions. Actually, the conclusions are not restricted to any specific frequencies; they could be extended to many other areas including applications to active cloaking, antennas, and wireless power transfer.

Design of Cross-talk Free Polarization Converter Based on Square Lattice Elliptical-Hole Core Circular-Hole Holey Fibers

Zhang Zejun, Yasuhide Tsuji, and Masashi Eguchi

Doc ID: 262543 Received 04 Apr 2016; Accepted 18 Jul 2016; Posted 21 Jul 2016  View: PDF

Abstract: In this paper, a novel polarization converter (PC) based on square lattice elliptical-hole core circular-hole holey fibers (EC-CHFs) is proposed and analyzed. The proposed PC has oblique elliptical air holes in the core region, which can achieve polarization rotation with a conversion length as short as 31.7 mm. Additionally, in order to achieve a cross-talk free PC element, we propose a PC element with three cores which can completely convert polarization state by 90 degrees. The structural tolerance of the cross-talk free PC element has also been discussed in detail.

Cr:YAG passively Q-switched single-frequency Nd:YVO4 ring cavity laser

Junwen Xue, Ying Pan, Wei Chen, Yujie Fang, Haijun Xie, Mingyuan Xie, Lu Sun, and Binghua Su

Doc ID: 267880 Received 06 Jun 2016; Accepted 18 Jul 2016; Posted 21 Jul 2016  View: PDF

Abstract: We design and demonstrate a thermally stable four-mirror discrete-component ring cavity for Q-switched laser output. An 880-nm fiber-coupled laser diode is used to pump a-cut Nd:YVO4 directly. A magnetic rotation glass (MR3-2) inserted into a permanent cylinder magnet, in combination with a half-wave plate and the polarized emission properties of Nd:YVO4, is used to obtain unidirectional laser operation. With this setup, for a pump power of 5 W, 2.75 W of continuous 1064-nm single-frequency laser output is obtained. Next, a Cr:YAG passive-Q crystal with small signal transmittance of 75% is inserted in between the two concave mirrors where the beam waist is located. Consequently, a passive Q-switching single-frequency linear polarization pulse with an average power of 1.02 W, pulse width of 60 ns, frequency of 21 kHz, peak power of 810 W, and single-pulse energy of 48 μJ is obtained. Further, we also propose a new method of using a Fabry–Pérot (FP) scanning interferometer to observe high-repetition rate Q-switched pulse output longitudinal-mode signals.

Broad band fiber optical parametric amplifier pumped by two chirped pulses

Damien Bigourd, Coralie Fourcade-Dutin, Olivier Vanvincq, and Emmanuel Hugonnot

Doc ID: 264603 Received 04 May 2016; Accepted 12 Jul 2016; Posted 13 Jul 2016  View: PDF

Abstract: Optical parametric amplifier pumped by two chirped pump pulses has been analytically and numerically investigated to predict the spectral gain bandwidth and its temporal distribution. We highlighted that the properties of the amplifier depend strongly on the relative chirp values and an uniform spectro-temporal gain can be obtained when the two chirps have opposite signs. A chirped signal pulse with a very broad bandwidth has also been combined to demonstrate the amplification of ultra-short pulse with this amplifier.

Efficient and Tunable Plasmon Excitation in Graphene-Bi2Te3 Heterostructure

Qiaoliang Bao, Yao Lu, Jingchao Song, Jian Yuan, Lei Zhang, Steve Wu, Wenzhi Yu, Meng zhao, Jinghua Teng, Kianping Loh, Chao Zhang, and Cheng Wei Qiu

Doc ID: 265378 Received 18 May 2016; Accepted 07 Jul 2016; Posted 25 Jul 2016  View: PDF

Abstract: Graphene plasmons have attracted a lot of attention due to large confinement and small mode volume. However, the amplitude of graphene plasmons is not sufficient for developing plasmonic devices due to relatively small light absorption of graphene in infrared regime or low coupling efficiency in general excitation strategy. The present work reported a strong and tunable plasmonic coupling in graphene-Bi2Te3 heterostructure with the help of Si gratings. The plasmonic resonance of graphene-Bi2Te3 can be largely tuned by changing the grating period. Unlike individual layered materials either graphene or Bi2Se3, the plasmonic wave in heterostructure graphene-Bi2Te3 has enhanced resonance magnitude and large shift to lower frequency. The idea to hybridize Dirac plasmons in different layered materials will stimulate the interest to study variant plasmonic heterostructures and trigger new terahertz device applications.

Single-mode laser output in Yb3+-doped fluorophosphate fiber

Chao Wang, Zhiquan Lin, Liyan Zhang, and Danping Chen

Doc ID: 263657 Received 22 Apr 2016; Accepted 01 Jul 2016; Posted 08 Jul 2016  View: PDF

Abstract: A heterogeneous fiber with Yb3+-doped fluorophosphate core and phosphate cladding was fabricated by the rod-in-tube and stacking technique. The concentration of Yb3+ in core glass can be up to 6×1020 ions/cm3. The lasing threshold was 900 mW and the lasing wavelength was centered at 1043 nm. A single-mode laser output with a slope efficiency of 13.6% with respect to absorbed pump power was obtained, for the first time to knowledge. The beam quality factor (M2) was measured to be 1.25. Thus, FP glass fiber is a good alternative for gain medium in short-linear-cavity single-frequency fiber laser.

Generation of six-mode cluster states in a coupled cavity array

Gaoxiang Li, Sujuan Wei, Wenju Gu, and lihui Sun

Doc ID: 259345 Received 12 Feb 2016; Accepted 28 Jun 2016; Posted 28 Jun 2016  View: PDF

Abstract: We consider a chain of six coupled single-mode cavities, each containing an ensemble of four-level atoms, and demonstrate how to prepare stationary six-mode cluster states of the atomic ensembles. We show that a six-mode cluster state can be created in a single step by driving the ensembles with laser pulses of suitably chosen Rabi frequencies and phases. Introducing linear superpositions of the collective bosonic modes of the atomic ensembles, we show that the superposition modes can independently evolve to a desired stationary state with the help of the cavity damping. We illustrate this method by examining three examples of the creation of linear, Hexagon and double square cluster states.

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