Broadband third-order optical nonlinearities of layered franckeite towards mid-infrared regime

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外文摘要：The study of nonlinear optical responses in the mid-infrared(mid-IR)regime is essential for advancing ultrafast mid-IR laser applications.However,nonlinear optical effects under mid-IR excitation are rarely reported due to the lack of suitable nonlinear optical materials.The natural van der Waals heterostructure franckeite,known for its narrow bandgap and stability in air,shows great potential for developing mid-IR nonlinear optical devices.We have experimentally demonstrated that layered franckeite exhibits a broadband wavelength-dependent nonlinear optical response in the mid-IR spectral region.Franckeite nanosheets were prepared using a liquid-phase exfoliation method,and their nonlinear optical response was characterized in the spectral range of 3000 nm to 5000 nm.The franckeite nanosheets exhibit broadband wavelength-dependent third-order nonlinearities,with nonlinear absorption and refraction coefficients estimated to be about 10-7 cm/W and 10-11 cm2/W,respectively.Additionally,a passively Q-switched fluoride fiber laser operating around a wavelength of 2800 nm was achieved,delivering nanosecond pulses with a signal-to-noise ratio of 43.6 dB,based on the nonlinear response of franckeite.These findings indicate that layered franckeite possesses broadband nonlinear optical characteristics in the mid-IR region,potentially enabling new possibilities for mid-IR photonic devices.

外文关键词：

third-order optical nonlinearitiesfranckeitemid-infraredQ-switching

作者：

徐志强、周甜甜、李洁、刘东阳、何源、李宁、刘潇、缪丽丽、赵楚军、文双春

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作者单位：

Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education &Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices,School of Physics and Electronics,Hunan University,Changsha 410082,China

School of Mechanical and Electrical Engineering,Heze University,Heze 274015,China

基金：

National Natural Science Foundation of ChinaNatural Science Foundation of Hunan Province,ChinaNatural Science Foundation of Shandong Province,ChinaDoctoral Fund of University of Heze

项目编号：

619750552023JJ30165ZR2022QF005XY22BS14

出版年：

2024

DOI：

10.1088/1674-1056/ad6ccb

中国物理B(英文版)

中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI

影响因子：0.995

ISSN：1674-1056

年,卷(期)：2024.33(10)