Ultrafast saturable absorption of MoS<sub>2</sub> nanosheets under different pulse-width excitation conditions

Jun Zhang; Hao Ouyang; Xin Zheng; Jie You; Runze Chen; Tong Zhou; Yizhen Sui; Yu Liu; Xiang’ai Cheng; Tian Jiang

doi:10.1364/OL.43.000243

Ultrafast saturable absorption of MoS₂ nanosheets under different pulse-width excitation conditions

Jun Zhang, Hao Ouyang, Xin Zheng, Jie You, Runze Chen, Tong Zhou, Yizhen Sui, Yu Liu, Xiang’ai Cheng, and Tian Jiang

Optics Letters
Vol. 43,
Issue 2,
pp. 243-246
(2018)
•https://doi.org/10.1364/OL.43.000243

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Jun Zhang, Hao Ouyang, Xin Zheng, Jie You, Runze Chen, Tong Zhou, Yizhen Sui, Yu Liu, Xiang’ai Cheng, and Tian Jiang, "Ultrafast saturable absorption of MoS₂ nanosheets under different pulse-width excitation conditions," Opt. Lett. 43, 243-246 (2018)

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Table of Contents Category
- Materials
Optics & Photonics Topics
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The topics in this list come from the OSA Optics and Photonics Topics applied to this article.
Previously assigned OCIS codes
- Optical materials (160.4670)
- Nanomaterials (160.4236)
- Photoluminescence (250.5230)
- Emission (300.2140)

About this Article
History
- Original Manuscript: November 28, 2017
- Manuscript Accepted: December 4, 2017
- Published: January 8, 2018

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Abstract

The newly raised two-dimensional material ${MoS}_{2}$ is regarded as an ideal candidate for saturated absorbers. Here, the open-aperture Z-scan method is used to study the saturation absorption (SA) response of monolayer and multilayer ${MoS}_{2}$ , considering laser irradiation with different pulse widths. Specifically, in cases of 10 ns and 10 ps laser pulses, the accumulative nonlinearity [e.g., free carrier absorption (FCA)] coupled with SA is found in both monolayer and multilayer ${MoS}_{2}$ . However, under a 65 fs pulse laser, the instantaneous nonlinearity [e.g., two-photon absorption (TPA)] and the SA effect turn to play a significant role. Additionally, the saturation of both TPA and FCA is observed in ${MoS}_{2}$ . Importantly, the modulation depth of ${MoS}_{2}$ shows different change trends by adjusting the laser pulse width.

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Pulse Width	$β_{0}$ (cm/GW, $\times 10^{5}$ )	$I_{sat}$ of $β_{0}$ ( $GW / {cm}^{2}$ )	$σ_{FCA 0}$ ( ${cm}^{2}$ , $\times 10^{- 18}$ )	$I_{sat}$ of $σ_{FCA 0}$ ( $GW / {cm}^{2}$ )
10 ns	−10.11	0.37	−14.50	0.27
10 ps	−7.24	7.65	N/A	N/A
65 fs	−1.67	18.56	N/A	N/A

Pulse Width	$β_{0}$ (cm/GW, $\times 10^{5}$ )	$I_{sat}$ of $β_{0}$ ( $GW / {cm}^{2}$ )	$σ_{FCA 0}$ ( ${cm}^{2}$ , $\times 10^{- 18}$ )	$I_{sat}$ of $σ_{FCA 0}$ ( $GW / {cm}^{2}$ )
10 ns	N/A	N/A	−1.01	0.19
10 ps	N/A	N/A	−37.22	3.51
65 fs	0.22	5.07	N/A	N/A

$I_{d}$	Monolayer ${MoS}_{2}$			Multilayer ${MoS}_{2}$
$I_{d}$	Ns	ps	fs	ns	ps	fs
( $GW / {cm}^{2}$ )	1.05	49.6	570.1	0.72	38.4	475.4

Pulse Width	$β_{0}$ (cm/GW, $\times 10^{5}$ )	$I_{sat}$ of $β_{0}$ ( $GW / {cm}^{2}$ )	$σ_{FCA 0}$ ( ${cm}^{2}$ , $\times 10^{- 18}$ )	$I_{sat}$ of $σ_{FCA 0}$ ( $GW / {cm}^{2}$ )
10 ns	−10.11	0.37	−14.50	0.27
10 ps	−7.24	7.65	N/A	N/A
65 fs	−1.67	18.56	N/A	N/A

Pulse Width	$β_{0}$ (cm/GW, $\times 10^{5}$ )	$I_{sat}$ of $β_{0}$ ( $GW / {cm}^{2}$ )	$σ_{FCA 0}$ ( ${cm}^{2}$ , $\times 10^{- 18}$ )	$I_{sat}$ of $σ_{FCA 0}$ ( $GW / {cm}^{2}$ )
10 ns	N/A	N/A	−1.01	0.19
10 ps	N/A	N/A	−37.22	3.51
65 fs	0.22	5.07	N/A	N/A

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