Z-scan measurement of the nonlinear refractive index of monolayer WS(2).
Opt Express
; 23(12): 15616-23, 2015 Jun 15.
Article
en En
| MEDLINE
| ID: mdl-26193541
ABSTRACT
Transition metal dichalcogenides (TMDCs), such as tungsten disulfide (WS(2)), are layered materials with strong in-plane bonding and weak out-of-plane interactions enabling exfoliation into two-dimensional layers of single unit cell thickness. Recent advances in nanoscale materials characterization and few layer TMDCs' unique optical properties make them a research hot-spot in nonlinear optics. In this work, the nonlinear refractive index of monolayer WS(2) has been characterized with Z-scan measurement under 800nm femtosecond pulsed laser excitation, and a value of n2 ≃ (8.1 ± 0.41) × 10(-13)m(2)/W is obtained. A shift from saturable absorption to reverse saturable absorption was observed at higher input pump intensities in the experiments. The transition process was analyzed using a phenomenological model based on two photon absorption, and the two photon absorption coeï¬cient was estimated about (3.7±0.28)×10(-6)m/W.
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Bases de datos:
MEDLINE
Tipo de estudio:
Qualitative_research
Idioma:
En
Revista:
Opt Express
Asunto de la revista:
OFTALMOLOGIA
Año:
2015
Tipo del documento:
Article