Type

Journal Article

Authors

Jun Wang
Georg S Duesberg
Long Zhang
Zhanghai Chen
Xiaoyan Zhang
Yuanxin Li
Chanyoung Yim
Nina C Berner
Sinéad Winters
Maria O'Brien
and 3 others

Subjects

Physics

Topics
two dimensional two photon absorption tpa films two photon absorption observation direct z scan near infrared

Direct Observation of Degenerate Two-Photon Absorption and Its Saturation in WS2 and MoS2 Monolayer and Few-Layer Films. (2015)

Abstract The optical nonlinearity of WS2 and MoS2 monolayer and few-layer films was investigated using the Z-scan technique with femtosecond pulses from the visible to the near-infrared range. The nonlinear absorption of few- and multilayer WS2 and MoS2 films and their dependences on excitation wavelength were studied. WS2 films with 1-3 layers exhibited a giant two-photon absorption (TPA) coefficient as high as (1.0 ± 0.8) × 10(4) cm/GW. TPA saturation was observed for the WS2 film with 1-3 layers and for the MoS2 film with 25-27 layers. The giant nonlinearity of WS2 and MoS2 films is attributed to a two-dimensional confinement, a giant exciton effect, and the band edge resonance of TPA.
Collections Ireland -> Trinity College Dublin -> PubMed

Full list of authors on original publication

Jun Wang, Georg S Duesberg, Long Zhang, Zhanghai Chen, Xiaoyan Zhang, Yuanxin Li, Chanyoung Yim, Nina C Berner, Sinéad Winters, Maria O'Brien and 3 others

Experts in our system

1
Jun Wang
Trinity College Dublin
Total Publications: 37
 
2
Georg Duesberg
Trinity College Dublin
Total Publications: 116
 
3
Long Zhang
Trinity College Dublin
Total Publications: 6
 
4
Xiaoyan Zhang
Trinity College Dublin
Total Publications: 6
 
5
Yuanxin Li
Trinity College Dublin
Total Publications: 3
 
6
Chanyoung Yim
Trinity College Dublin
Total Publications: 14
 
7
Nina C Berner
Trinity College Dublin
Total Publications: 20
 
8
Maria O'Brien
Trinity College Dublin
Total Publications: 7