Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Coupled WGMs in a Dielectric Microsphere: Proof-of-Concept of Optical Pressure Microsensor

Version 1 : Received: 15 June 2021 / Approved: 16 June 2021 / Online: 16 June 2021 (09:28:30 CEST)

How to cite: Minin, I.; Minin, O.; Geints, Y. Coupled WGMs in a Dielectric Microsphere: Proof-of-Concept of Optical Pressure Microsensor. Preprints 2021, 2021060428 (doi: 10.20944/preprints202106.0428.v1). Minin, I.; Minin, O.; Geints, Y. Coupled WGMs in a Dielectric Microsphere: Proof-of-Concept of Optical Pressure Microsensor. Preprints 2021, 2021060428 (doi: 10.20944/preprints202106.0428.v1).

Abstract

We propose the physical proof-of-concept of a new simple miniature pressure sensor based on the whispering gallery modes (WGMs) optically excited in a dielectric microsphere placed near a flexible reflective membrane, which acts as an ambient pressure sensing element. WGMs excitation is carried out by free-space coupling of optical radiation to a microsphere. The distinctive feature of proposed sensor design is double excitation of optical eigenmodes by forward and backward propagating radiation reflected from a membrane that causes WGMs interference in particle volume. The optical intensity of resulting resonant field established in the microsphere carries information about the exact position of the pressure-loaded reflecting membrane. The sensitivity of the proposed sensor strongly depends on the quality factor of the excited resonant mode, as well as geometrical and mechanical parameters of the flexible membrane. We propose to register not the displacement of the position of the WGM resonance, but the change in its amplitude under the influence of the change in the distance between the sphere and the mirror under the influence of pressure. Important advantages of the proposed sensor are miniature design (linear sensor dimensions depends only on the membrane diameter) and the absence of a mechanical contact of pressure-sensitive element with WGM resonator.

Subject Areas

whispering gallery modes; microsphere; membrane; pressure sensor; optical interference

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