Dan Wu, Wen Dong, Y. Ge, Xueqin Cao, Mingjian Shi, Erkang Li, Nan Ma, Yixuan Zhou, Yuan‐yuan Huang, Chunhui Lu, Xinlong Xu
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Large nonlinear optical absorption and refraction of β-In2Se3 thin film from above to below bandgap excitation
Nonlinear optical materials, especially two-dimensional materials, are anticipated to reveal broadband optical nonlinearity for future miniaturized photonic applications. Herein, we report a physical vapor deposition method to produce β-In2Se3 thin film and investigate the broadband nonlinear absorption (β) and refraction (n2) characteristics. The β-In2Se3 semiconductor shows an excellent optical nonlinearity with large β in 10^2 cm/GW scale and n2 in 10^-12 cm2/W scale from visible to near-infrared wavelengths, which are superior to those of metal carbides and nitrides (MXenes) and metal-organic frameworks (MOFs). This excellent optical nonlinearity makes β-In2Se3 a promising candidate for advanced nanophotonic devices and beyond.
期刊介绍:
Applied Physics Express (APEX) is a letters journal devoted solely to rapid dissemination of up-to-date and concise reports on new findings in applied physics. The motto of APEX is high scientific quality and prompt publication. APEX is a sister journal of the Japanese Journal of Applied Physics (JJAP) and is published by IOP Publishing Ltd on behalf of the Japan Society of Applied Physics (JSAP).