Nonlinear optical responses in two-dimensional transition metal dichalcogenide multilayer: WS2, WSe2, MoS2 and Mo0.5W0.5S2

被引：138
作者：
Bikorimana, S. [1 ,2 ]
Lama, P. [1 ,2 ]
Walser, A. [1 ,2 ]
Dorsinville, R. [1 ,2 ]
Anghel, S. [3 ]
Mitioglu, A. [3 ]
Micu, A. [3 ]
Kulyuk, L. [3 ,4 ]
机构：
[1] CUNY City Coll, Dept Elect Engn, New York, NY 10031 USA
[2] CUNY, Grad Ctr, New York, NY 10031 USA
[3] Inst Appl Phys, Acad Str 5, MD-2028 Kishinev, Moldova
[4] Moscow Technol Univ, MIREA, Vernadsky Ave 78, Moscow 119454, Russia
来源：
OPTICS EXPRESS | 2016年 / 24卷 / 18期
基金：
俄罗斯科学基金会;
关键词：
Z-SCAN MEASUREMENT; ULTRA-FAST PHOTONICS; DOPED FIBER LASER; SATURABLE ABSORBER; MONOLAYER MOS2; REFRACTIVE-INDEX; SINGLE-BEAM; ABSORPTION; GRAPHENE; PHOTOLUMINESCENCE;
D O I：
10.1364/OE.24.020685
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Synthetic two-dimensional transition metal dichalcogenides such as tungsten disulphide (WS2), tungsten diselenide (WSe2), molybdenum disulphide (MoS2) as well as mixed molybdenum tungsten disulphide (Mo0.5W0.5S2) single crystals were grown by the chemical vapor transport method using halogens (bromine or chlorine) as transport agents. Multi-layer samples were cleaved from the single crystals, and their nonlinear optical (NLO) properties were obtained from both open aperture and closed aperture Z-scan measurements using a picosecond mode-locked Nd:YAG laser operating at a wavelength of 1064 nm, with pulse duration of 25 ps and 20 Hz repetition rate. Both WS2 and MoS2 exhibited nonlinear saturable absorption (SA), whereas WSe2 and Mo0.5W0.5S2 showed nonlinear two-photon absorption (2PA). A large 2PA coefficient beta as high as + 1.91x10(-8) cm/W was obtained for the Mo0.5W0.5S2, and an index of refraction coefficient gamma = -2.47x10(-9) cm(2)/W was obtained for the WSe2 sample. (C) 2016 Optical Society of America
引用
收藏
页码：20685 / 20695
页数：11
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