Journal
ACS NANO
Volume 9, Issue 7, Pages 7142-7150Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b03480
Keywords
two-photon absorption; saturable absorption; WS2; MoS2; two-dimensional semiconductors; Z-scan
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Funding
- NSFC [61308034, 61178007]
- STCSM [12ZR1451800]
- External Cooperation Program of BIC, CAS [181231KYSB20130007]
- SFI [14/TIDA/2329, PI_10/IN.1/I3030]
- Excellent Academic Leader of Shanghai [10XD1404600]
- National 10000-Talent Program
- Science Foundation Ireland (SFI) [14/TIDA/2329] Funding Source: Science Foundation Ireland (SFI)
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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) x 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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