Layer-modulated two-photon absorption in MoS2:probing the shift of the excitonic dark state and band-edge

被引：0

作者：

YAFENG XIE ^{[1
,2
]}

SAIFENG ZHANG ^{[1
]}

YUANXIN LI ^{[1
]}

NINGNING DONG ^{[1
]}

XIAOYAN ZHANG ^{[1
]}

LEI WANG ^{[1
,2
]}

WEIMIN LIU ^{[3
]}

IVAN M.KISLYAKOV ^{[1
]}

JEAN-MICHEL NUNZI ^{[1
,4
]}

HONGJI QI ^{[1
]}

LONG ZHANG ^{[1
]}

JUN WANG ^{[1
,2
,5
]}

机构：

[1] Laboratory of Micro-Nano Optoelectronic Materials and Devices and CAS Key Laboratory of Materials for High-Power Laser,Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences

[2] Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences

[3] School of Physical Science and Technology, ShanghaiTech University

[4] Department of Physics, Engineering Physics & Astronomy and Department of Chemistry, Queen's University,Kingston

[5] State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences

来源：

Photonics Research | 2019年 / 07期

基金：

中国国家自然科学基金; 上海市自然科学基金;

关键词：

TPA; red; Layer-modulated two-photon absorption in MoS2:probing the shift of the excitonic dark state and band-edge;

D O I：

暂无

中图分类号：

O437 [非线性光学（强光与物质的作用）];

学科分类号：

070207 ; 0803 ;

摘要：

Questions hovering over the modulation of bandgap size and excitonic effect on nonlinear absorption in twodimensional transition metal dichalcogenides(TMDCs) have restricted their application in micro/nano optical modulator, optical switching, and beam shaping devices. Here, degenerate two-photon absorption(TPA) in the near-infrared region was studied experimentally in mechanically exfoliated MoS2from single layer to multilayer.The layer-dependent TPA coefficients were significantly modulated by the detuning of the excitonic dark state(2p). The shift of the quasiparticle bandgap and the decreasing of exciton binding energy with layers were deduced, combined with the non-hydrogen model of excitons in TMDCs and the scaling rule of semiconductors.Our work clearly demonstrates the layer modulation of nonlinear absorption in TMDCs and provides support for layer-dependent nonlinear optical devices, such as optical limiters and optical switches.

引用

页码：762 / 770

页数：9

共 8 条

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