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- Title
Resonant enhancement of nonlinear absorption and ultrafast dynamics of WS2 nanosheets.
- Authors
Shao, Yabin; Chen, Chen; Han, Jing; Wu, Wenzhi; Kong, Degui; Gao, Yachen
- Abstract
The comparative study on nonlinear absorption of WS2 nanosheets was performed by using nanosecond Z-scan measurements at 532 nm and 500 nm. It was found that, WS2 nanosheets exhibit saturable absorption (SA) at low excitation intensities, and the saturable intensity at 500 nm is much stronger than that at 532 nm, which implies that resonance plays main role. With the increase of incident intensity, a switch from SA to reverse saturable absorption (RSA) occurs. Besides, ultrafast dynamics of WS2 nanosheets were investigated by using femtosecond pump-probe technique. Photo-dynamics process was found to contain a double exponential energy relaxation with a fast decay component (14 ps) and a slow one (145 ps).
- Subjects
PUMP probe spectroscopy; ABSORPTION
- Publication
Optical & Quantum Electronics, 2020, Vol 52, Issue 6, p1
- ISSN
0306-8919
- Publication type
Article
- DOI
10.1007/s11082-020-02421-6