AI Article Synopsis
- * WS2 films with 1-3 layers showed an exceptionally high two-photon absorption coefficient, reaching (1.0 ± 0.8) × 10(4) cm/GW, while TPA saturation occurred in specific layer counts for both WS2 and MoS2 films.
- * The strong nonlinearity in these films is attributed to factors like two-dimensional confinement, an enhanced exciton effect, and band edge resonance of two-photon absorption.
Article 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.
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| http://dx.doi.org/10.1021/acsnano.5b03480 | DOI Listing |
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