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Related Experiment Video

Updated: May 1, 2026

Multi-timescale Microscopy Methods for the Characterization of Fluorescently-labeled Microbubbles for Ultrasound-Triggered Drug Release
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Quasi-droplet microbubbles for high resolution sensing applications.

Yong Yang, Jonathan Ward, Síle Nic Chormaic

    Optics Express
    |March 26, 2014
    PubMed
    Summary

    Fused silica microbubbles offer promising sensing capabilities. Optimized designs, particularly in the quasi-droplet regime, enhance resolution for applications like optical sensing.

    Area of Science:

    • Photonics and optical sensing
    • Materials science
    • Nanotechnology

    Background:

    • Fused silica microbubbles are explored for optical applications.
    • Whispering gallery modes (WGMs) are sensitive to microbubble parameters.
    • Sensing resolution is often limited by quality factor (Q) trade-offs.

    Purpose of the Study:

    • To numerically investigate the optical properties and sensing potential of fused silica microbubbles.
    • To determine the impact of bubble diameter and shell thickness on mode characteristics.
    • To identify optimal microbubble geometries for enhanced sensing resolution.

    Main Methods:

    • Finite element method (FEM) simulations were employed.
    • Analysis of mode characteristics including quality factor (Q) and effective refractive index.

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  • Evaluation of sensing sensitivity and resolution based on geometrical parameters.

    • Main Results:

    • Thinner shells improve sensitivity for WGMs but reduce the Q-factor.
    • The quasi-droplet regime is defined and shown to be optimal for sensing.
    • High resolution is achievable with quasi-droplet microbubbles, even for water-filled cavities in the C-band.

    Conclusions:

    • Microbubble geometry significantly influences optical properties and sensing performance.
    • The quasi-droplet regime offers a pathway to high-resolution optical sensing.
    • Fused silica microbubbles are viable candidates for advanced optical sensing applications.