Z-scan measurement of the nonlinear refractive index of monolayer WS2

被引：111

作者：

Zheng, Xin ^{[1
]}

Zhang, Yangwei ^{[2
]}

Chen, Runze ^{[3
]}

Cheng, Xiang'ai ^{[1
,3
]}

Xu, Zhongjie ^{[1
,3
]}

Jiang, Tian ^{[1
,3
,4
]}

机构：

[1] Natl Univ Def Technol, Coll Optoelect Sci & Engn, Changsha 410073, Hunan, Peoples R China

[2] Peking Univ, Int Ctr Quantum Mat, Sch Phys, Beijing 100871, Peoples R China

[3] Natl Univ Def Technol, State Key Lab High Performance Comp, Changsha 410073, Hunan, Peoples R China

[4] Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 10084, Peoples R China

来源：

OPTICS EXPRESS | 2015年 / 23卷 / 12期

基金：

中国国家自然科学基金;

关键词：

PHOTOLUMINESCENCE; CRYSTAL; MOSE2;

D O I：

10.1364/OE.23.015616

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Transition metal dichalcogenides (TMDCs), such as tungsten disulfide (WS2), are layered materials with strong in-plane bonding and weak out-of-plane interactions enabling exfoliation into two-dimensional layers of single unit cell thickness. Recent advances in nanoscale materials characterization and few layer TMDCs' unique optical properties make them a research hot-spot in nonlinear optics. In this work, the nonlinear refractive index of monolayer WS2 has been characterized with Z-scan measurement under 800nm femtosecond pulsed laser excitation, and a value of n(2) similar or equal to (8.1 +/- 0.41) x 10(-13) m(2)/W is obtained. A shift from saturable absorption to reverse saturable absorption was observed at higher input pump intensities in the experiments. The transition process was analyzed using a phenomenological model based on two photon absorption, and the two photon absorption coefficient was estimated about (3.7 +/- 0.28) x 10(-6) m/W. (C)2015 Optical Society of America

引用

页码：15616 / 15623

页数：8

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