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

Journals >Chinese Optics Letters >Volume 18 >Issue 2 >Page 021902 > Article

Chinese Optics Letters
Vol. 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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DOI: 10.3788/COL202018.021902 Cite this Article Set citation alerts

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[J]. Chinese Optics Letters, 2020, 18(2): 021902 Copy Citation Text

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TEM and SAED characterizations of few-layer nanosheets of (a) Mo0.53W0.47Te2, (b) MoTe2, (c) WTe2; EDS spectra of (d) Mo0.53W0.47Te2, (e) MoTe2, (f) WTe2; AFM images and data of (g) Mo0.53W0.47Te2, (h) MoTe2, (i) WTe2.

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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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%