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Strain-based tunable optical microresonator with an in-fiber rectangular air bubble.

Shen Liu, Zhongyuan Sun, Lin Zhang

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    |August 31, 2018
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    This summary is machine-generated.

    We developed a novel in-fiber whispering gallery mode (WGM) resonator using an air bubble, achieving high quality factors and precise wavelength tuning via strain. This breakthrough offers a near-lossless, tunable optical component for advanced photonic applications.

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    Area of Science:

    • Photonics
    • Optical Engineering
    • Materials Science

    Background:

    • Whispering gallery mode (WGM) resonators are crucial for sensing and optical devices.
    • Existing WGM resonators often face limitations in tunability and loss.
    • In-fiber fabrication offers advantages for integration and miniaturization.

    Purpose of the Study:

    • To demonstrate a novel strain-tunable, near-lossless WGM resonator.
    • To achieve high quality factors and precise wavelength control in an in-fiber device.
    • To explore the potential of in-fiber air bubble structures for optical applications.

    Main Methods:

    • Fabrication of an in-fiber rectangular air bubble resonator by splicing standard single-mode fibers.
    • Characterization of the resonator's optical properties, including quality factor and free spectral range.
    • Application of tensile strain to tune the resonant wavelength and analysis of tuning rates.

    Main Results:

    • Achieved a high quality factor exceeding 10^6.
    • Demonstrated precise wavelength tuning with a voltage-tuning rate of ~31.96 pm/V and strain-tuning rate of ~14.12 pm/μϵ.
    • Obtained a total tunable bandwidth of ~14.12 nm, exceeding twice the azimuthal free spectral range.

    Conclusions:

    • The developed in-fiber air bubble WGM resonator is highly tunable and near-lossless.
    • Strain-based tuning offers precise control over resonant wavelengths with high accuracy.
    • This technology holds promise for next-generation integrated photonic devices and optical sensing.