Fiber-coupled photonic crystal nanocavity for reconfigurable formation of coupled cavity system

Tomohiro Tetsumoto, Yuta Ooka, Takasumi Tanabe

研究成果: Conference contribution

抄録

High Q optical cavities are employed to realize a coupled cavity system with which to achieve optical signal processing. Photonic crystal (PhC) nanocavities are particularly attractive because they are suitable for integration. However, they usually suffer from low coupling efficiency with optical fiber and poor resonant wavelength controllability. We recently demonstrated cavity mode formation by placing a tapered nanofiber close to a two-dimensional photonic crystal waveguide. The cavity mode couples directly with the nanofiber, which results in a coupling efficiency of 39% with a high Q of over half a million. The cavity is formed due to the modulation of the effective refractive index, which is caused by bringing a nanofiber close to the silicon slab. Precise tuning of the resonant wavelength becomes possible by changing the contact area of the nanofiber. In this study, we demonstrate the coupling and de-coupling of coupled PhC nanocavities formed by a nanofiber placed on a PhC waveguide. The wavelength shift of one of the cavities (mode A) is more sensitive than that of the other cavity (mode B) to a change in the nanofiber contact area. By using this difference, we can tune the resonant wavelength of mode A (Q = 4.6×105) to that of mode B (Q = 6.0×105). Then, a clear anti-crossing with a mode splitting of g/2π = 0.94 GHz is observed, which is the result of the coupling of the two modes. A reconfigurable coupled cavity system was demonstrated.

本文言語English
ホスト出版物のタイトルPhotonic and Phononic Properties of Engineered Nanostructures VI
編集者Shawn-Yu Lin, Ali Adibi, Axel Scherer
出版社SPIE
ISBN(電子版)9781628419917
DOI
出版ステータスPublished - 2016
イベントPhotonic and Phononic Properties of Engineered Nanostructures VI - San Francisco, United States
継続期間: 2016 2月 152016 2月 18

出版物シリーズ

名前Proceedings of SPIE - The International Society for Optical Engineering
9756
ISSN(印刷版)0277-786X
ISSN(電子版)1996-756X

Other

OtherPhotonic and Phononic Properties of Engineered Nanostructures VI
国/地域United States
CitySan Francisco
Period16/2/1516/2/18

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • 応用数学
  • 電子工学および電気工学
  • コンピュータ サイエンスの応用

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