Coupling of a whispering gallery mode to a silicon chip with photonic crystal

Yuyang Zhuang, Hajime Kumazaki, Shun Fujii, Riku Imamura, Nurul Ashikin Binti Daud, Rammaru Ishida, Heming Chen, Takasumi Tanabe

Research output: Contribution to journalArticle

Abstract

We demonstrate the efficient coupling (99.5%) of a silica whispering gallery mode microresonator directly with a silicon chip by using a silicon photonic crystal waveguide as a coupler. The efficient coupling is attributed to the small effective refractive index difference between the two devices. The large group index of the photonic crystal waveguide mode also contributes to the efficient coupling. A coupling Q of 2.68 × 106 is obtained, which allows us to achieve the critical coupling of a silica whispering gallery mode with an intrinsic Q of close to 107 with a Si chip.

Original languageEnglish
Pages (from-to)5731-5734
Number of pages4
JournalOptics Letters
Volume44
Issue number23
DOIs
Publication statusPublished - 2019 Jan 1

    Fingerprint

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Zhuang, Y., Kumazaki, H., Fujii, S., Imamura, R., Daud, N. A. B., Ishida, R., Chen, H., & Tanabe, T. (2019). Coupling of a whispering gallery mode to a silicon chip with photonic crystal. Optics Letters, 44(23), 5731-5734. https://doi.org/10.1364/OL.44.005731