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26 November 2023 Double-ring coupled structure for efficient sum-frequency generation of longwave mid-infrared signal
Xiaobao Zhang, Xiao Yang, Zhifu Luo, Xiaoyu Liu, Ride Wang
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Proceedings Volume 12776, Infrared, Millimeter-Wave, and Terahertz Technologies X; 1277605 (2023) https://doi.org/10.1117/12.2688906
Event: SPIE/COS Photonics Asia, 2023, Beijing, China
Abstract
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.
(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Xiaobao Zhang, Xiao Yang, Zhifu Luo, Xiaoyu Liu, and Ride Wang "Double-ring coupled structure for efficient sum-frequency generation of longwave mid-infrared signal", Proc. SPIE 12776, Infrared, Millimeter-Wave, and Terahertz Technologies X, 1277605 (26 November 2023); https://doi.org/10.1117/12.2688906
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KEYWORDS
Upconversion
Phase matching
Whispering gallery modes
Sum frequency generation
Microresonators
Mid-IR
Nonlinear optics
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