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Controlling thermo-optic response in microresonators using bimaterial cantilevers.

Biswajeet Guha, Michal Lipson

    Optics Letters
    |December 23, 2014
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    We developed a new method to control thermo-optic sensitivity in nanophotonic devices using bimaterial cantilevers. This platform enables athermal operation and enhanced sensitivity for resonant detectors and thermal imagers.

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    Area of Science:

    • Nanophotonics
    • Optoelectronics
    • Materials Science

    Background:

    • Thermo-optic effects in nanophotonic devices, particularly silicon ring resonators, limit their operational stability and sensitivity.
    • Controlling the thermo-optic coefficient is crucial for advancing photonic integrated circuits and sensing applications.

    Purpose of the Study:

    • To demonstrate a novel platform for actively controlling thermo-optic sensitivity in nanophotonic devices.
    • To achieve athermal operation in silicon ring resonators by compensating for the inherent thermo-optic effect.
    • To enhance the sensitivity of resonant detectors and thermal imagers.

    Main Methods:

    • Utilizing evanescent coupling of light with bimaterial cantilevers to manage thermal feedback.
    • Designing cantilevers to provide negative thermal feedback for passive compensation of the waveguide's thermo-optic effect.
    • Implementing the platform with silicon ring resonators to test athermal operation and sensitivity enhancement.

    Main Results:

    • Demonstrated athermal operation over a 14°C range in cantilever-coupled silicon ring resonators, limited by fabrication tolerances.
    • Showcased the platform's ability to provide positive thermal feedback, overcoming material thermo-optic limitations.
    • Validated the potential for increased sensitivity in resonant detectors and thermal imagers.

    Conclusions:

    • The demonstrated bimaterial cantilever platform offers a versatile method for controlling thermo-optic sensitivity in nanophotonic devices.
    • This approach enables robust athermal operation and opens new avenues for highly sensitive photonic sensors and imagers.