Octagonal silica toroidal microcavity for controlled optical coupling

Takumi Kato, Wataru Yoshiki, Ryo Suzuki, Takasumi Tanabe

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


We fabricated polygonal silica toroidal microcavities to achieve stable mechanical coupling with an evanescent coupler such as a tapered fiber. The octagonal cavity was fabricated by using a combination of isotropic etching, anisotropic etching, and laser reflow. It offers both high and low coupling efficiencies with the cavity mode even when the coupler is in contact with the cavity, which makes the device more practically because of easy alignment. A numerical simulation showed that an octagonal silica toroidal microcavity had an optical quality factor of 8.8 × 10 6.

Original languageEnglish
Article number121101
JournalApplied Physics Letters
Issue number12
Publication statusPublished - 2012 Sep 17

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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