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.

元の言語English
ホスト出版物のタイトルPhotonic and Phononic Properties of Engineered Nanostructures VI
出版者SPIE
9756
ISBN(電子版)9781628419917
DOI
出版物ステータスPublished - 2016
イベントPhotonic and Phononic Properties of Engineered Nanostructures VI - San Francisco, United States
継続期間: 2016 2 152016 2 18

Other

OtherPhotonic and Phononic Properties of Engineered Nanostructures VI
United States
San Francisco
期間16/2/1516/2/18

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Optical fiber coupling
Nanofibers
Photonic crystals
Photonic Crystal
Cavity
Fiber
photonics
cavities
fibers
crystals
Wavelength
Waveguides
wavelengths
Optical signal processing
Waveguide
Q factors
Silicon
Optical Signal Processing
Contact
waveguides

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

これを引用

Tetsumoto, T., Ooka, Y., & Tanabe, T. (2016). Fiber-coupled photonic crystal nanocavity for reconfigurable formation of coupled cavity system. : Photonic and Phononic Properties of Engineered Nanostructures VI (巻 9756). [97561J] SPIE. https://doi.org/10.1117/12.2212255

Fiber-coupled photonic crystal nanocavity for reconfigurable formation of coupled cavity system. / Tetsumoto, Tomohiro; Ooka, Yuta; Tanabe, Takasumi.

Photonic and Phononic Properties of Engineered Nanostructures VI. 巻 9756 SPIE, 2016. 97561J.

研究成果: Conference contribution

Tetsumoto, T, Ooka, Y & Tanabe, T 2016, Fiber-coupled photonic crystal nanocavity for reconfigurable formation of coupled cavity system. : Photonic and Phononic Properties of Engineered Nanostructures VI. 巻. 9756, 97561J, SPIE, Photonic and Phononic Properties of Engineered Nanostructures VI, San Francisco, United States, 16/2/15. https://doi.org/10.1117/12.2212255
Tetsumoto T, Ooka Y, Tanabe T. Fiber-coupled photonic crystal nanocavity for reconfigurable formation of coupled cavity system. : Photonic and Phononic Properties of Engineered Nanostructures VI. 巻 9756. SPIE. 2016. 97561J https://doi.org/10.1117/12.2212255
Tetsumoto, Tomohiro ; Ooka, Yuta ; Tanabe, Takasumi. / Fiber-coupled photonic crystal nanocavity for reconfigurable formation of coupled cavity system. Photonic and Phononic Properties of Engineered Nanostructures VI. 巻 9756 SPIE, 2016.
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AB - 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.

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