Giant two-photon absorption in monolayer MoS2

被引：190

作者：

Li, Yuanxin ^{[1
]}

Dong, Ningning ^{[1
]}

Zhang, Saifeng ^{[1
]}

Zhang, Xiaoyan ^{[1
]}

Feng, Yanyan ^{[1
]}

Wang, Kangpeng ^{[1
]}

Zhang, Long ^{[1
]}

Wang, Jun ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, Key Lab Mat High Power Laser, Shanghai 201800, Peoples R China

[2] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, State Key Lab High Field Laser Phys, Shanghai 201800, Peoples R China

来源：

LASER & PHOTONICS REVIEWS | 2015年 / 9卷 / 04期

关键词：

Two-photon absorption; two-photon pumped frequency upconverted luminescence; saturable absorption; transition-metal dichalcogenides; MoS2; MOLYBDENUM-DISULFIDE MOS2; CHEMICAL-VAPOR-DEPOSITION; DOPED FIBER LASER; SATURABLE ABSORBER; LAYER MOS2; NONLINEAR REFRACTION; ATOMIC LAYERS; SEMICONDUCTORS; SATURATION; NANOSHEETS;

D O I：

10.1002/lpor.201500052

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Strong two-photon absorption (TPA) in monolayer MoS2 is demonstrated in contrast to saturable absorption (SA) in multilayer MoS2 under the excitation of femtosecond laser pulses in the near-infrared region. MoS2 in the forms of monolayer single crystal and multilayer triangular islands are grown on either quartz or SiO2/Si by employing the seeding method through chemical vapor deposition. The nonlinear transmission measurements reveal that monolayer MoS2 possesses a nonsaturation TPA coefficient as high as approximate to(7.62 +/- 0.15) x10(3)cm/GW, larger than that of conventional semiconductors by a factor of 10(3). As a result of TPA, two-photon pumped frequency upconverted luminescence is observed directly in the monolayer MoS2. For the multilayer MoS2, the SA response is demonstrated with the ratio of the excited-state absorption cross section to ground-state cross section of approximate to 0.18. In addition, the laser damage threshold of the monolayer MoS2 is approximate to 97 GW/cm(2), larger than that of the multilayer MoS2 of approximate to 78 GW/cm(2).

引用

页码：427 / 434

页数：8