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Chip-based silica microspheres for cavity optomechanics.

Xuefeng Jiang, Min Wang, Mark C Kuzyk

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    |October 20, 2015
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    We developed on-chip silica microspheres with superior thermal coupling to silicon wafers. These chip-based microspheres enable lower laser power for optical bistability and are ideal for vacuum optomechanics research.

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    Area of Science:

    • Photonics and optical engineering
    • Materials science
    • Nanotechnology

    Background:

    • Traditional silica microspheres offer unique optical and optomechanical properties.
    • Laser-induced heating can limit the performance of microsphere devices.
    • Integrating microspheres onto silicon platforms presents fabrication and thermal management challenges.

    Purpose of the Study:

    • To experimentally realize on-chip silica microspheres with enhanced thermal properties.
    • To investigate the impact of chip integration on laser-induced heating and optical bistability.
    • To evaluate the suitability of chip-based microspheres for optomechanical studies.

    Main Methods:

    • Fabrication of silica microspheres directly integrated onto a silicon wafer.
    • Experimental characterization of thermal coupling between microspheres and the silicon substrate.
    • Measurement of optical power thresholds for heating-induced optical bistability.
    • Assessment of optical and optomechanical properties in a vacuum environment.

    Main Results:

    • Excellent thermal coupling achieved between on-chip silica microspheres and the silicon wafer.
    • Significantly reduced laser-induced heating observed in chip-based microspheres.
    • Lower threshold optical power required for heating-induced optical bistability.
    • Chip-based microspheres exhibit optical and optomechanical properties comparable to fiber-attached counterparts.

    Conclusions:

    • On-chip silica microspheres offer a promising platform for reduced thermal effects in optical devices.
    • The demonstrated chip-based approach facilitates lower power operation for optical bistability.
    • These microspheres are well-suited for advanced optomechanical studies, particularly in vacuum settings.