Time-domain observation of strong coupling between counter-propagating ultra-high Q whispering gallery modes

Wataru Yoshiki, Akitoshi Chen-Jinnai, Tomohiro Tetsumoto, Shun Fujii, Takasumi Tanabe

研究成果: Conference contribution

2 被引用数 (Scopus)


An ultra-high Q whispering gallery mode (WGM) cavity is attractive because the light-matter interaction is enhanced inside it. In terms of science and engineering, an interesting use of a WGM cavity is as a coupled system. When two cavity modes are strongly coupled, they are split in the frequency domain and photons are transferred cyclically between the two modes in the time domain. Recently, the time-domain observation and control of the coupling states were reported with photonic crystal nanocavities, and this technology is essential for developing a quantum node and a quantum network. However, such experiments have not yet been achieved with ultra-high Q modes despite the potential benefit to be gained from the use of ultra-high Q cavities. In this study, we observed strong coupling between ultra-high Q modes in the time domain for the first time. We employed two counter-propagating modes that coupled with each other via surface scattering in a silica toroid microcavity. We employed two tapered fibers (add-drop configuration), one for excitation and the other for observing the energy oscillation between two cavities, which is a necessary technique for directly observing energy in a cavity. The results revealed clear oscillatory behavior, which was induced by the strong coupling. In addition, the oscillation period in the time domain precisely matched that inferred from the mode splitting in the frequency domain, and the measured results showed excellent agreement with those calculated with the developed numerical model.

ホスト出版物のタイトルLaser Resonators, Microresonators, and Beam Control XVIII
編集者Alexis V. Kudryashov, Alan H. Paxton, Vladimir S. Ilchenko, Lutz Aschke
出版ステータスPublished - 2016
イベントLaser Resonators, Microresonators, and Beam Control XVIII - San Francisco, United States
継続期間: 2016 2月 152016 2月 18


名前Proceedings of SPIE - The International Society for Optical Engineering


OtherLaser Resonators, Microresonators, and Beam Control XVIII
国/地域United States
CitySan Francisco

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
  • コンピュータ サイエンスの応用
  • 応用数学
  • 電子工学および電気工学


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