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Fabrication and Testing of Microfluidic Optomechanical Oscillators
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Strain-induced tunable dual-bottle-shaped optical microresonator.

Haoye Qin, Yiheng Yin, Ming Ding

    Optics Letters
    |July 7, 2020
    PubMed
    Summary

    Researchers developed a novel dual-bottle microresonator achieving a high Q-factor over 10^7. This microresonator demonstrates record strain sensitivity for enhanced sensing applications.

    Area of Science:

    • Photonics
    • Optical Sensing
    • Micro-optics

    Background:

    • Whispering gallery mode (WGM) microresonators are crucial for optical sensing.
    • Existing microresonator designs face limitations in sensitivity and Q-factor.

    Purpose of the Study:

    • To introduce a novel dual-bottle microresonator design.
    • To investigate its whispering gallery mode spectra and strain-tuning characteristics.
    • To achieve ultra-high strain sensitivity for advanced sensor applications.

    Main Methods:

    • Fabrication of a dual-bottle microresonator with specific dimensions (lateral resonator diameter ~180µm, central resonator diameter 124.91µm).
    • Characterization of whispering gallery mode spectra, analyzing resonance, interference, and scattering effects.

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  • Coupling the microresonator with a tapered fiber at different positions to measure strain-tuning sensitivity.

    • Main Results:

    • Achieved a high Q-factor exceeding 10^7.
    • Investigated and explained the WGM spectra through microbottle resonance, mode interference, and scattering.
    • Demonstrated strain-tuning sensitivity ranging from 0.126 to 1.7 pm/µε.
    • Attained a record strain sensitivity of 1.7 pm/µε with optimal fiber coupling at the central resonator's middle.

    Conclusions:

    • The novel dual-bottle microresonator design significantly enhances Q-factor and strain sensitivity.
    • The achieved sensitivity surpasses previously reported solid microresonator strain sensors.
    • This advancement holds promise for developing highly sensitive optical strain sensors.