Photonic crystal circular-shaped microcavity and its uniform cavity-waveguide coupling property due to presence of whispering gallery mode | Zendy

Po-Tsung Lee | Zendy; Tsan-Wen Lu | Zendy; Chia-Min Yu | Zendy; Chung-Chuan Tseng | Zendy

Open Access

Photonic crystal circular-shaped microcavity and its uniform cavity-waveguide coupling property due to presence of whispering gallery mode

Author(s) -

Po-Tsung Lee,

Tsan-Wen Lu,

Chia-Min Yu,

Chung-Chuan Tseng

Publication year - 2007

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.15.009450

Subject(s) - whispering gallery wave , lasing threshold , finite difference time domain method , photonic crystal , optics , materials science , coupling (piping) , waveguide , resonator , q factor , laser , optoelectronics , physics , metallurgy

In this report, we investigate a photonic crystal circular-shaped microcavity (removing seven air holes) sustaining whispering-gallery mode (WGM) by shifting the 12 nearest air holes according to the concept of cavity-shaping in micro-disk and micro-gear lasers. The WGM modal characteristics are investigated by three-dimensional (3D) finite-difference time-domain (FDTD) simulations. From well-fabricated devices and simulated results, we obtain and identify WGM single-mode lasing with low threshold and high measured quality factor. By inserting additional waveguides, we also investigate its uniform coupling behaviors in different waveguide-cavity-waveguide geometries in both FDTD simulations and experiments.

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