Dr. Zhifu Luo Profile

Dr. Zhifu Luo

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Proceedings Article | 26 November 2023 Paper

Double-ring coupled structure for efficient sum-frequency generation of longwave mid-infrared signal

Xiaobao Zhang, Xiao Yang, Zhifu Luo, Xiaoyu Liu, Ride Wang

Proceedings Volume 12776, 1277605 (2023) https://doi.org/10.1117/12.2688906

KEYWORDS: Upconversion, Whispering gallery modes, Phase matching, Sum frequency generation, Microresonators, Mid-IR, Nonlinear optics

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Sum-frequency generation, which can convert low frequency signal to the higher frequency range based on parametric process, is a successful and effective method for infrared detection. Here we report a whispering gallery mode (WGM) microresonator with a double-ring coupled structure for efficient parametric upconversion of long-wave mid-infrared signal. Due to the large dispersion between signal and pump/upconversion light, it is difficult to meet the phase matching condition in micoresonators. In the double-ring coupled scheme, the phase matching is achieved through energy distribution of optical modes in different rings. Specifically, the inner ring is regarded as an effective refractive index regulator of the signal mode. Through theoretical calculation and finite element simulation, the feasibility and adjustability of this scheme are verified. Compared with previous schemes which usually use nonlinear crystal as platforms, WGM microresonators with ultrahigh Q and small mode volume have the potential to obtain high efficiency frequency conversion and ultra-low power requirement with a small physical footprint.

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