Structural characterization of thin-walled microbubble cavities

Whispering gallery mode (WGM) microbubble cavities are a versatile optofluidic sensing platform owing to their hollow core geometry. To increase the light-matter interaction and, thereby, achieve a higher sensitivity, thin-walled microbubbles are desirable. However, a lack of knowledge about the pre...

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Bibliographic Details
Published in:arXiv.org 2023-05
Main Authors: Mohammed Zia Jalaludeen, Li, Shilong, Tian, Ke, Sasaki, Toshio, Síle Nic Chormaic
Format: Article
Language:English
Subjects:
Finite element method
Ion beams
Optical waveguides
Structural analysis
Online Access:Get full text
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Summary:Whispering gallery mode (WGM) microbubble cavities are a versatile optofluidic sensing platform owing to their hollow core geometry. To increase the light-matter interaction and, thereby, achieve a higher sensitivity, thin-walled microbubbles are desirable. However, a lack of knowledge about the precise geometry of hollow microbubbles prevents us from having an accurate theoretical model to describe the WGMs and their response to external stimuli. In this work, we provide a complete characterization of the wall structure of a microbubble and propose a theoretical model for the WGMs in this thin-walled microcavity based on the optical waveguide approach. Structural characterization of the wavelength-scale wall is enabled by focused ion beam milling and scanning electron microscopy imaging. The proposed theoretical model is verified by finite element method simulations. Our approach can readily be extended to other low-dimensional micro-/nanophotonic structures.
ISSN:2331-8422
DOI:10.48550/arxiv.2305.04458