Ultrahigh‐Resolution Optical Fiber Thermometer Based on Microcavity Opto‐Mechanical Oscillation

• Published in: Advanced photonics research 2022-09, Vol.3 (9), p.n/a
• Main Authors: Liu, Yize, Jiang, Junfeng, Liu, Kun, Wang, Shuang, Niu, Panpan, Xu, Tianhua, Zhang, Xuezhi, Wang, Ziyihui, Wang, Tong, Ding, Zhenyang, Liu, Tiegen
• Format: Article
• Language: English
• Subjects: Copper; Deformation; Earthquakes; fiber sensing; Light; Mechanics; microcavity; opto-mechanical oscillation; Power; Radiation; Sensors
• ISSN: 2699-9293; 2699-9293
• DOI: 10.1002/adpr.202200052

High‐resolution temperature measurement is nerve‐wracking obstruction for precise characterization of many physical, chemical, and biological processes. To solve this problem, a novel microcavity–optomechanical–oscillation‐based thermometer is proposed. The microcavity serving as a link parametrically couples the mechanical resonator and optical resonator in the same structure and provides a natural and highly sensitive temperature transduction mechanism and ultrahigh‐resolution optical demodulation. The mathematical model of geometrical parameters, mechanics, and material properties for temperature response mechanism is established and verified experimentally. The proposed thermometer has a thermal sensitivity of 11 300 Hz °C−1 and an ultrahigh‐temperature resolution of 1 × 10−4 °C, to the best of one's knowledge, which is the highest temperature resolution with a silica cavity. By exciting the optomechanical oscillation in a microcavity, the mechanical resonator and optical resonator are parametrically coupled in the same structure. Also, herein, a natural and highly sensitive temperature transduction mechanism and ultrahigh‐resolution optical demodulation are provided. The first use of cavity optomechanics in temperature sensing field makes these sensors much higher resolution than traditional whispering gallery mode sensors.