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High data rate transient sensing using dielectric micro-resonator.

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    High-speed tracking of microresonator optical mode shifts is achieved by using harmonic laser tuning. This method overcomes thermal limitations, enabling wide-bandwidth sensing applications with improved accuracy.

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    Area of Science:

    • Photonics and Optical Engineering
    • Sensing Technologies
    • Applied Physics

    Background:

    • Microresonator sensors rely on tracking whispering gallery optical modes (WGM).
    • Traditional methods face limitations in high-speed transient-sensing due to laser tuning distortions caused by thermal inertia.
    • Accurate tracking of WGM shifts is crucial for wide-bandwidth sensing applications.

    Purpose of the Study:

    • To present a novel approach for high-speed tracking of optical mode shifts in microresonators.
    • To address the challenges of laser tuning limitations in high data rate transient-sensing.
    • To enable wide-bandwidth sensing applications through improved WGM shift tracking.

    Main Methods:

    • Utilized harmonic waveform tuning for diode lasers, instead of ramp or triangular waveforms.
    • Employed a Fabry-Perot interferometer for calibrating laser output across various frequencies and amplitudes.
    • Implemented a modified cross-correlation method for tracking WGM shifts in transmission spectra.

    Main Results:

    • Harmonic laser tuning effectively eliminated high-speed transient thermal effects.
    • Achieved high-speed tracking of WGM shifts up to 10 kHz in force sensor experiments.
    • Experimental results demonstrated good agreement with the developed thermal model for laser tuning.

    Conclusions:

    • The harmonic tuning approach significantly enhances the performance of microresonator-based sensors for high-speed applications.
    • This method overcomes thermal inertia limitations, allowing for wider tuning ranges and reduced waveform distortion.
    • The developed technique offers a robust solution for wide-bandwidth sensing requiring precise optical mode shift tracking.