Stable Packaging Method of Ultrahigh-Q Microcavity General Devices

Whispering gallery mode (WGM) microcavities can confine photons within a microscale volume for long periods of time, strongly enhancing light-matter interactions, making it an important platform in optical science and applications. However, current research on microcavity system relays on precise mechanical coupling with microscope monitoring, and its resonance characteristics are highly sensitive to external environmental factors such as vibration, temperature and humidity changes, which greatly limits the practical application of microcavity devices. Therefore, we propose an ultra-stable packaging method with air/water tightness and constant temperature characteristics. A variety of fixatives with different Young's modulus gradients and low coefficient of thermal expansion were used to design a package structure with overall vibration isolation and buffering effect, in order to ensure the stability of coupling mode and improve the robustness of the microcavity module. Hopefully, our research work will pave the way for the application of optical microcavity devices in high-speed optical communication, nonlinear optics, narrow linewidth lasers and ultra-high sensitivity sensors.