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Abstract
This study focuses on the optical excitation and characterization of cylindrical and spherical microcavities using tapered optical fibers. Optical microcavity technologies offer significant potential for optical sensing applications requiring ultra-high sensitivity. In this study, the interaction mechanisms between tapered fiber structures and microcavities were examined in detail, and the properties of so-called “whispering gallery mode” (WGM) resonances were analyzed. Cylindrical microcavities provide a sensitive sensing platform against environmental changes due to their simple geometric structures, while spherical microcavities stand out with their symmetrical shapes and higher quality factors (Q-factors). These structures play a critical role in enhancing spectral resolution and achieving precise measurements in optical sensing. In the experimental setup, adiabatic tapering techniques were employed to fabricate tapered optical fibers, and the efficiency of fiber-microcavity interactions was optimized. This setup allowed for resolving WGMs spectrally making precise measurement of Q-factors possible. Larger free spectral ranges (FSR) were obtained with cylindrical microcavities, whereas spherical microcavities achieved extremely high Q-factors with denser mode spectra. The results revealed the critical impact of geometric properties, fabrication quality, and alignment precision of microcavities on optical performance. This study provides a significant foundation for the integration of tapered fiber-based microcavities into advanced sensing technologies. In the future, optimizing fabrication techniques and system geometries could further enhance the sensitivity and performance of microcavities.
Published Version
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