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Investigation of second- and third-harmonic generation in few-layer gallium selenide by multiphoton microscopy.


ABSTRACT: Gallium selenide (GaSe) is a layered semiconductor and a well-known nonlinear optical crystal. The discovery of graphene has created a new vast research field focusing on two-dimensional materials. We report on the nonlinear optical properties of few-layer GaSe using multiphoton microscopy. Both second- and third-harmonic generation from few-layer GaSe flakes were observed. Unexpectedly, even the peak at the wavelength of 390 nm, corresponding to the fourth-harmonic generation or the sum frequency generation from third-harmonic generation and pump light, was detected during the spectral measurements in thin GaSe flakes.

SUBMITTER: Karvonen L 

PROVIDER: S-EPMC4437303 | BioStudies | 2015-01-01

SECONDARY ACCESSION(S): 10.1038/srep10334

REPOSITORIES: biostudies

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