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Nonlinear absorption and nonlinear refraction in a chemical vapor deposition-grown, ultrathin hexagonal boron nitride film

Qiuyun Ouyang, Kai Zhang, Weiqiang Chen, Feng Zhou, and Wei Ji

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Abstract

An ultrathin hexagonal boron nitride film is synthesized by a method of chemical vapor deposition. Irradiated by femtosecond laser pulses in the visible spectrum of 400–800 nm, it exhibits multiphoton absorption and positive nonlinear refraction properties. The two-photon and three-photon absorption coefficients are of the order of 10−5 cm W−1 and 10−14 cm3 W−2, respectively. The nonlinear refraction coefficient is as large as ∼10−8 cm2 W−1. These nonlinear coefficients lead to figures of merit that meet the material requirements for all-optical switching devices.

© 2016 Optical Society of America

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