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Updated: Mar 29, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Mode-interactions and polarization conversion in a crystalline microresonator.

Wenle Weng, Andre N Luiten

    Optics Letters
    |December 2, 2015
    PubMed
    Summary

    Researchers observed strong interactions and polarization conversion between light modes in a birefringent whispering-gallery-mode resonator. This finding validates a coupled-mode theory model for tunable optical device development.

    Area of Science:

    • Optics and Photonics
    • Condensed Matter Physics

    Background:

    • Whispering-gallery-mode (WGM) resonators are crucial for various photonic applications.
    • Understanding mode interactions is key to controlling light propagation in resonant systems.

    Purpose of the Study:

    • To investigate and characterize the couplings between orthogonally polarized modes in a birefringent WGM resonator.
    • To validate a theoretical model describing these mode interactions.

    Main Methods:

    • Experimental observation of mode couplings in a birefringent WGM resonator.
    • Utilizing coupled-mode theory to develop a phenomenological model.

    Main Results:

    • Observed strong interactions between orthogonally polarized modes, leading to polarization conversion.

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  • Demonstrated avoidance of mode crossings due to these strong couplings.
  • Showed excellent agreement between the experimental results and the coupled-mode theory model.

    • Conclusions:

    • Birefringent WGM resonators facilitate controllable and tunable mode interactions.
    • The coupled-mode theory effectively describes polarization conversion and mode avoidance in such systems.
    • This device serves as a valuable platform for studying fundamental light-matter interactions.