Whispering gallery modes silica resonators: a platform for optical sensing

Eyal Yacoby; Yosef London; Yekutiel Meshorer; Sharone Goldring; Chana Goren; Shaul Pearl

doi:10.1117/12.2617749

25 May 2022 Whispering gallery modes silica resonators: a platform for optical sensing

Eyal Yacoby, Yosef London, Yekutiel Meshorer, Sharone Goldring, Chana Goren, Shaul Pearl

Proceedings Volume 12142, Fiber Lasers and Glass Photonics: Materials through Applications III; 121420T (2022) https://doi.org/10.1117/12.2617749
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Abstract

Optical Whispering Gallery Mode (WGM) microresonators are an ideal platform for miniature and high sensitive sensors. They exhibit very small mode volumes and extremely high Q factors of the order of 10⁶ - 10⁹ providing a platform with low nonlinearity thresholds and low detection limits to environmental changes. Here we present and discuss some of the WGM-based applications we have been developing in our lab. Specifically, we present a WGM strain sensor based on a silica stretchable microsphere, with a Q factor of 108 . Tension stress is applied along a microsphere with two fiber tails by pulling on one tail. Consequently, the microsphere's WGMs are shifted and the measurement may serve as a strain sensor. Based on this strain sensor, a WGM magnetic sensor is suggested where the mechanical response of a magnetostrictive material to a varying magnetic field applies the tension stress. In addition, a narrow linewidth laser source for these sensors is described here as well, where a multimode diode laser is locked to a single WGM of the microsphere via self-injection feedback from the microsphere. This optical locking is accompanied with a substantial spectral narrowing of the multimode diode laser.

Conference Presentation

Citation Download Citation

Eyal Yacoby, Yosef London, Yekutiel Meshorer, Sharone Goldring, Chana Goren, and Shaul Pearl "Whispering gallery modes silica resonators: a platform for optical sensing", Proc. SPIE 12142, Fiber Lasers and Glass Photonics: Materials through Applications III, 121420T (25 May 2022); https://doi.org/10.1117/12.2617749

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