Ultra-broadband enhanced nonlinear saturable absorption for Mo0.53W0.47Te2 nanosheets

Zhengting Du; Hui Wu; Tianqi Zhang; Zhenda Xie; Yangyang Lü; Xinjie Lü; Jinlong Xu; Gang Zhao; Shining Zhu

doi:10.3788/COL202018.021902

Chinese Optics Letters, Volume. 18, Issue 2, 021902(2020)

Ultra-broadband enhanced nonlinear saturable absorption for Mo_0.53W_0.47Te₂ nanosheets

Zhengting Du¹, Hui Wu¹, Tianqi Zhang¹, Zhenda Xie², Yangyang Lü¹, Xinjie Lü¹, Jinlong Xu^2、*, Gang Zhao^1、**, and Shining Zhu¹

Author Affiliations

¹College of Engineering and Applied Sciences, National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China

²School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China

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Figures & Tables(4)

Fig. 1. TEM and SAED characterizations of few-layer nanosheets of (a) ${Mo}_{0.53} W_{0.47} {Te}_{2}$ , (b) ${MoTe}_{2}$ , (c) ${WTe}_{2}$ ; EDS spectra of (d) ${Mo}_{0.53} W_{0.47} {Te}_{2}$ , (e) ${MoTe}_{2}$ , (f) ${WTe}_{2}$ ; AFM images and data of (g) ${Mo}_{0.53} W_{0.47} {Te}_{2}$ , (h) ${MoTe}_{2}$ , (i) ${WTe}_{2}$ .

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$(a) Raman spectra of Mo0.53W0.47Te2, MoTe2, and WTe2. (b) Comparison of recorded transmittance spectra and corresponding fitted lines of Mo0.53W0.47Te2, MoTe2, and WTe2. (c) The refractive index of Mo0.53W0.47Te2, MoTe2, and WTe2 based on the relationship of Kramers–Kronig.$

Fig. 2. (a) Raman spectra of ${Mo}_{0.53} W_{0.47} {Te}_{2}$ , ${MoTe}_{2}$ , and ${WTe}_{2}$ . (b) Comparison of recorded transmittance spectra and corresponding fitted lines of ${Mo}_{0.53} W_{0.47} {Te}_{2}$ , ${MoTe}_{2}$ , and ${WTe}_{2}$ . (c) The refractive index of ${Mo}_{0.53} W_{0.47} {Te}_{2}$ , ${MoTe}_{2}$ , and ${WTe}_{2}$ based on the relationship of Kramers–Kronig.

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Fig. 3. Open-aperture Z-scan results of ${Mo}_{0.53} W_{0.47} {Te}_{2}$ , ${MoTe}_{2}$ , and ${WTe}_{2}$ at (a) 639 nm, (b) 1060 nm, and (c) 2 μm.

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Table 1. Optics Parameters of Mo0.53W0.47Te2, 2H-MoTe2, and WTe2

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Table 1. Optics Parameters of Mo0.53W0.47Te2, 2H-MoTe2, and WTe2

Sample	$λ (μ m)$	$n$	$α_{0} (10^{4} {cm}^{- 1})$	$α_{NL} (10^{3} cm / GW)$	$Im χ^{(3)} (10^{- 6} esu)$	$FOM (10^{- 10} cm \cdot esu)$	$I_{s} (GW / {cm}^{2})$	A_s
${Mo}_{0.53} W_{0.47} {Te}_{2}$	0.639	5.7	3.07	−42.10	−26.287	8.562	1.82	6.50%
	1.06	5.9	3.04	−65.10	−72.313	23.787	1.12	5.40%
	2.0	7.1	3.05	−52.10	−168.366	55.202	2.8	4.20%
${MoTe}_{2}$	0.639	2.7	1.06	−4.71	−0.682	0.226	8.7	5.89%
	1.06	0.33	1.08	−4.01	−0.014	0.013	12.9	4.30%
	2.0	0.11	0.92	−2.97	−0.002	0.003	4.24	1.17%
${WTe}_{2}$	0.639	11.7	0.82	−1.31	−3.40	4.13	3.04	1.30%
	1.06	11.6	1.08	−1.50	−6.46	5.97	4.43	2.21%
	2.0	11.6	0.92	−1.46	−12.50	13.58	13.9	1.87%

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Zhengting Du, Hui Wu, Tianqi Zhang, Zhenda Xie, Yangyang Lü, Xinjie Lü, Jinlong Xu, Gang Zhao, Shining Zhu, "Ultra-broadband enhanced nonlinear saturable absorption for Mo_0.53W_0.47Te₂ nanosheets," Chin. Opt. Lett. 18, 021902 (2020)

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Paper Information

Category: Nonlinear Optics

Received: Oct. 17, 2019

Accepted: Nov. 14, 2019

Published Online: Feb. 18, 2020

The Author Email: Jinlong Xu (zhaogang@nju.edu.cn), Gang Zhao (longno.2@163.com)

DOI:10.3788/COL202018.021902

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology