Strain-induced tunable dual-bottle-shaped optical microresonator

摘要

We present a novel dual-bottle microresonator with a high Q-factor exceeding 10(7). Such a resonator consists of two lateral resonators and one central resonator. The maximum diameter of the lateral resonator is similar to 180 mu m, and the central diameter is 124.91 mu m. Characteristics of the whispering gallery mode spectra are investigated and explained. by the microbottle resonance, mode interference, and scattering effects. Strain-tuning sensitivity varies from 0.126 to 1.7 pm/mu epsilon when a tapered fiber is placed at the resonator's different positions. With a coupled area at the middle of the central resonator, the highest, to the best of our knowledge, strain sensitivity of 1.7 pm/mu epsilon, which is higher than previously reported solid microresonator strain sensors, is achieved. (C) 2019 Optical Society of America