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.
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