Superior third-order nonlinearity in inorganic fullerene-like WS<sub>2</sub> nanoparticles

Tianlun Li; Rui Hao; Lingling Zhang; Jianyong Mao; Feng Li; Yanpeng Zhang; Jixiang Fang; Lei Zhang

doi:10.1364/PRJ.399490

Photonics Research, Volume. 8, Issue 12, 1881(2020)

Superior third-order nonlinearity in inorganic fullerene-like WS₂ nanoparticles

Tianlun Li^1、†, Rui Hao^1、†, Lingling Zhang¹, Jianyong Mao¹, Feng Li¹, Yanpeng Zhang¹, Jixiang Fang^1,2, and Lei Zhang^1、*

Author Affiliations

¹Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Laboratory of Information Photonic Technique, School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China

²e-mail: jxfang@mail.xjtu.edu.cn

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Figures & Tables(6)

$Structure of IF-like WS2 NPs and their optical response. (a) Scanning electron microscopy image, (b) high-resolution transmission electron microscopy image, and (c) X-ray diffraction pattern of the synthesized IF-like WS2 NPs. (d) Raman spectra of the WS2 dispersion excited by 633 and 532 nm lasers. (e) Transmittance of WS2 NP dispersions. The interesting wavelength range is highlighted in the gray area.$

Fig. 1. Structure of IF-like WS2 NPs and their optical response. (a) Scanning electron microscopy image, (b) high-resolution transmission electron microscopy image, and (c) X-ray diffraction pattern of the synthesized IF-like WS2 NPs. (d) Raman spectra of the WS2 dispersion excited by 633 and 532 nm lasers. (e) Transmittance of WS2 NP dispersions. The interesting wavelength range is highlighted in the gray area.

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$(a) Schematic of the experimental setup and (b) evolution of the concentric ring-shaped diffraction patterns excited by a fs pulse laser at λ=800 nm. The time capturing the diffraction patterns is inserted at the upper-left corner of each image.$

Fig. 2. (a) Schematic of the experimental setup and (b) evolution of the concentric ring-shaped diffraction patterns excited by a fs pulse laser at λ=800 nm. The time capturing the diffraction patterns is inserted at the upper-left corner of each image.

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$(a) Dependence of the number of SSPM rings N on the laser intensity I at different wavelengths. (b) Dependence of nonlinear refractive index and third-order susceptibility of monolayer IF−WS2 NPs on wavelength.$

Fig. 3. (a) Dependence of the number of SSPM rings N on the laser intensity I at different wavelengths. (b) Dependence of nonlinear refractive index and third-order susceptibility of monolayer IF−WS2 NPs on wavelength.

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Fig. 4. Evolution of the diameter of the outermost SSPM ring along the vertical and horizontal directions and Δn2/n2 at λ=800 nm.

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Fig. 5. Dependence of Δn2/n2 on the incident intensity at different wavelengths.

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Table 1. $n_{2}$ and $χ_{monolayer}^{(3)}$ for Different 2D Materials Obtained by SSPM

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Table 1. $n_{2}$ and $χ_{monolayer}^{(3)}$ for Different 2D Materials Obtained by SSPM

2D Materials	$n_{2} ({cm}^{2} / W)$	$χ_{monolayer}^{(3)} (esu)$	Laser Wavelength (nm)	References
Graphene	$2.5 \times 10^{- 5}$	$10^{- 7}$	532, CW	[20]
${MoS}_{2} / {WS}_{2} / {MoSe}_{2}$	$\sim 10^{- 7}$	$10^{- 9}$	488, CW	[23]
BP	$\sim 10^{- 5}$	$\sim 10^{- 8}$	350–1160, pulse	[38]
SnS	$\sim 10^{- 5}$	$\sim 10^{- 10}$	532/633, CW	[39]
Antimonene	$\sim 10^{- 5}$	$\sim 10^{- 8}$	405/785/1064, CW	[40]
${Ti}_{3} C_{2} T_{x}$	$\sim 10^{- 4}$	$\sim 10^{- 7}$	457/532/671, CW	[41]
Te	$\sim 10^{- 5}$	/	457/532/671, CW	[42]
${WS}_{2} NPs$	$\sim 10^{- 5}$	$\sim 10^{- 7}$	720–800, pulse	This work

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Tianlun Li, Rui Hao, Lingling Zhang, Jianyong Mao, Feng Li, Yanpeng Zhang, Jixiang Fang, Lei Zhang, "Superior third-order nonlinearity in inorganic fullerene-like WS₂ nanoparticles," Photonics Res. 8, 1881 (2020)

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