Whispering gallery modes in deformed microcavities via transformation optics

ORAL

Abstract

In dielectric cavities with rotational symmetry, very long-lived modes, so called Whispering Gallery Modes (WGMs), can be formed by total internal reflection. The ultra-high Q-factor of WGMs is of great merit in cutting-edge photonic devices, however their isotropic emission due to the rotational symmetry is a serious drawback in applications requiring directional light sources. Here, we have shown that, utilizing transformation optics, optical mode properties such as Q-factor and emission directionality can be tailored at will. The Q-spoiling problem inevitably involved for emission directionality is resolved by restoring WGMs in two dimensional deformed dielectric cavities. The restored WGMs retain the ultra-high Q factor even in considerably deformed cavities and exhibit the emission directionality as well.

*We were supported by Project Code (IBS-R024-D1).

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Authors

  • Jung-Wan Ryu

    • Center for Theoretical Physics of Complex Systems, Institute for Basic Science

  • Yushin Kim

    • Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology

  • Soo-Young Lee

    • School of Electronics Engineering, Kyungpook National University

  • Inbo Kim

    • School of Electronics Engineering, Kyungpook National University

  • Jae-Hyung Han

    • School of Electronics Engineering, Kyungpook National University

  • Heung-Sik Tae

    • School of Electronics Engineering, Kyungpook National University

  • Muhan Choi

    • School of Electronics Engineering, Kyungpook National University

  • Bumki Min

    • Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology