In this paper, a fiber-coupled whispering gallery mode (WGM) microsphere resonator was fabricated with using a simple package scheme. The resonant properties of the WGM resonator are analyzed and their responses to bulk refractive index and temperature are theoretically and experimentally investigated. Experiment results show that the bulk refractive index sensitivity is about 20.49 nm/RIU with detection limit of $4.3\times 10^{-4}$ RIU and very low temperature sensitivity of 7.38 pm/°C. Moreover, the WGM microsphere resonator is firstly used for acoustic intensity level sensing, and the sensitivity is about −1.9 pm/dB, which can enlarge the application field of the WGM sensor and can be used for noise monitoring to enhance environmental protection.

中文翻译：

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光纤耦合回音廊模式微球谐振器的制备及传感性能研究

在本文中，使用简单的封装方案制造了光纤耦合回音壁模式 (WGM) 微球谐振器。分析了 WGM 谐振器的谐振特性，并从理论上和实验上研究了它们对体折射率和温度的响应。实验结果表明，体折射率灵敏度约为 20.49 nm/RIU，检测限为 $4.3\times 10^{-4}$ RIU，温度灵敏度非常低，为 7.38 pm/°C。此外，WGM微球谐振器首次用于声强级传感，灵敏度约为-1.9 pm/dB，可扩大WGM传感器的应用领域，可用于噪声监测，增强环境保护。