Soliton microcomb-assisted microring photonic thermometer with ultra-high resolution and broad range  

作　　者：CHENG ZHANG JIN WANG GUOGUO KANG JIANXIN GAO ZHIER QU SHUAI WAN CHUNHUA DONG YIJIE PAN JIFENG QU 

机构地区：[1]Center for Advanced Measurement Science,National Institute of Metrology,Beijing 100029,China [2]School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China [3]College of Optical and Electronic Technology,China Jiliang University,Hangzhou 310018,China [4]CAS Key Laboratory of Quantum Information,University of Science and Technology of China,Hefei 230026,China [5]CAS Center for Excellence in Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China

出　　处：《Photonics Research》2023年第10期I0001-I0010,共10页光子学研究（英文版）

基　　金：National Key Research and Development Program of China(2022YFF0608304);National Natural Science Foundation of China(62075206,62205324)。

摘　　要：Whispering gallery mode resonators(WGMRs)have proven their advantages in terms of sensitivity and precision in various sensing applications.However,when high precision is pursued,the WGMR demands a high-quality factor usually at the cost of its free spectral range(FSR)and corresponding measurement range.In this article,we propose a high-resolution and wide-range temperature sensor based on chip-scale WGMRs,which utilizes a Si_(3)N_(4)ring resonator as the sensing element and a Mg F_(2)-based microcomb as a broadband frequency reference.By measuring the beatnote signal of the WGM and microcomb,the ultra-high resolution of 58 micro-Kelvin(μK)was obtained.To ensure high resolution and broad range simultaneously,we propose an ambiguity-resolving method based on the gradient of feedback voltage and combine it with a frequency-locking technique.In a proof-of-concept experiment,a wide measurement range of 45 K was demonstrated.Our soliton comb-assisted temperature measurement method offers high-resolution and wide-range capabilities,with promising advancements in various sensing applications.

关 键 词：RESONATOR resolution high 

分 类 号：TN751.2[电子电信—电路与系统] TP212.11[自动化与计算机技术—检测技术与自动化装置]