Extraordinary Second Harmonic Generation in ReS2 Atomic Crystals

Yu Song; Siqi Hu; Miao Ling Lin; Xuetao Gan; Ping Heng Tan; Jianlin Zhao

doi:10.1021/acsphotonics.8b00685

Extraordinary Second Harmonic Generation in ReS₂ Atomic Crystals

Yu Song, Siqi Hu, Miao Ling Lin, Xuetao Gan, Ping Heng Tan, Jianlin Zhao

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Abstract

We report the observations of unexpected layer-dependent, strong, and anisotropic second harmonic generations (SHGs) in atomically thin ReS₂. Appreciable (negligible) SHGs are obtained from even (odd) numbers of ReS₂ layers, which is opposite to the layer-dependence of SHGs in group VI transition metal dichalcogenides, such as MoS₂ and WS₂. The results are analyzed from ReS₂'s crystal structure, implying second harmonic polarizations generated from the interlayer coupling. Pumped by a telecom-band laser, SHG from the bilayer ReS₂ is almost 1 order of magnitude larger than that from the monolayer WS₂. The estimated second-order nonlinear susceptibility of 900 pm/V is remarkably high among those reported in two-dimensional materials. The laser polarization dependence of ReS₂'s SHG is strongly anisotropic and indicates its distorted lattice structure with more unequal and nonzero second-order susceptibility elements.

Original language	English
Pages (from-to)	3485-3491
Number of pages	7
Journal	ACS Photonics
Volume	5
Issue number	9
DOIs	https://doi.org/10.1021/acsphotonics.8b00685
State	Published - 19 Sep 2018

Keywords

exciton resonance
interlayer coupling
polarization
rhenium disulfide
second harmonic generation
transition metal dichalcogenides

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10.1021/acsphotonics.8b00685

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title = "Extraordinary Second Harmonic Generation in ReS2 Atomic Crystals",

abstract = "We report the observations of unexpected layer-dependent, strong, and anisotropic second harmonic generations (SHGs) in atomically thin ReS2. Appreciable (negligible) SHGs are obtained from even (odd) numbers of ReS2 layers, which is opposite to the layer-dependence of SHGs in group VI transition metal dichalcogenides, such as MoS2 and WS2. The results are analyzed from ReS2's crystal structure, implying second harmonic polarizations generated from the interlayer coupling. Pumped by a telecom-band laser, SHG from the bilayer ReS2 is almost 1 order of magnitude larger than that from the monolayer WS2. The estimated second-order nonlinear susceptibility of 900 pm/V is remarkably high among those reported in two-dimensional materials. The laser polarization dependence of ReS2's SHG is strongly anisotropic and indicates its distorted lattice structure with more unequal and nonzero second-order susceptibility elements.",

keywords = "exciton resonance, interlayer coupling, polarization, rhenium disulfide, second harmonic generation, transition metal dichalcogenides",

author = "Yu Song and Siqi Hu and Lin, {Miao Ling} and Xuetao Gan and Tan, {Ping Heng} and Jianlin Zhao",

note = "Publisher Copyright: {\textcopyright} 2018 American Chemical Society.",

year = "2018",

month = sep,

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doi = "10.1021/acsphotonics.8b00685",

language = "英语",

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T1 - Extraordinary Second Harmonic Generation in ReS2 Atomic Crystals

AU - Song, Yu

AU - Hu, Siqi

AU - Lin, Miao Ling

AU - Gan, Xuetao

AU - Tan, Ping Heng

AU - Zhao, Jianlin

PY - 2018/9/19

Y1 - 2018/9/19

N2 - We report the observations of unexpected layer-dependent, strong, and anisotropic second harmonic generations (SHGs) in atomically thin ReS2. Appreciable (negligible) SHGs are obtained from even (odd) numbers of ReS2 layers, which is opposite to the layer-dependence of SHGs in group VI transition metal dichalcogenides, such as MoS2 and WS2. The results are analyzed from ReS2's crystal structure, implying second harmonic polarizations generated from the interlayer coupling. Pumped by a telecom-band laser, SHG from the bilayer ReS2 is almost 1 order of magnitude larger than that from the monolayer WS2. The estimated second-order nonlinear susceptibility of 900 pm/V is remarkably high among those reported in two-dimensional materials. The laser polarization dependence of ReS2's SHG is strongly anisotropic and indicates its distorted lattice structure with more unequal and nonzero second-order susceptibility elements.

AB - We report the observations of unexpected layer-dependent, strong, and anisotropic second harmonic generations (SHGs) in atomically thin ReS2. Appreciable (negligible) SHGs are obtained from even (odd) numbers of ReS2 layers, which is opposite to the layer-dependence of SHGs in group VI transition metal dichalcogenides, such as MoS2 and WS2. The results are analyzed from ReS2's crystal structure, implying second harmonic polarizations generated from the interlayer coupling. Pumped by a telecom-band laser, SHG from the bilayer ReS2 is almost 1 order of magnitude larger than that from the monolayer WS2. The estimated second-order nonlinear susceptibility of 900 pm/V is remarkably high among those reported in two-dimensional materials. The laser polarization dependence of ReS2's SHG is strongly anisotropic and indicates its distorted lattice structure with more unequal and nonzero second-order susceptibility elements.

KW - exciton resonance

KW - interlayer coupling

KW - polarization

KW - rhenium disulfide

KW - second harmonic generation

KW - transition metal dichalcogenides

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DO - 10.1021/acsphotonics.8b00685

M3 - 文章

AN - SCOPUS:85052302472

SN - 2330-4022

VL - 5

SP - 3485

EP - 3491

JO - ACS Photonics

JF - ACS Photonics

IS - 9

ER -

Extraordinary Second Harmonic Generation in ReS₂ Atomic Crystals

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