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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 6 — Mar. 15, 2010
  • pp: 5668–5673

Ultrafast nonlinear effects in hydrogenated amorphous silicon wire waveguide

Yuya Shoji, Takeshi Ogasawara, Toshihiro Kamei, Youichi Sakakibara, Satoshi Suda, Kenji Kintaka, Hitoshi Kawashima, Makoto Okano, Toshifumi Hasama, Hiroshi Ishikawa, and Masahiko Mori  »View Author Affiliations

Optics Express, Vol. 18, Issue 6, pp. 5668-5673 (2010)

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We, for the first time, present the ultrafast optical nonlinear response of a hydrogenated amorphous silicon (a-Si:H) wire waveguide using femtosecond pulses. We show cross-phase and cross-absorption modulations measured using the heterodyne pump-probe method and estimate the optical Kerr coefficient and two-photon absorption coefficient for the amorphous silicon waveguide. The pumping energy of 0.8 eV is slightly lower than that required to achieve two-photon excitation at the band gap of a-Si:H (~1.7 eV). An ultrafast response of less than 100 fs is observed, which indicates that the free-carrier effect is suppressed by the localized states in the band gap.

© 2010 OSA

OCIS Codes
(190.4390) Nonlinear optics : Nonlinear optics, integrated optics
(230.4320) Optical devices : Nonlinear optical devices
(230.7370) Optical devices : Waveguides

ToC Category:
Nonlinear Optics

Original Manuscript: January 13, 2010
Revised Manuscript: March 1, 2010
Manuscript Accepted: March 2, 2010
Published: March 4, 2010

Yuya Shoji, Takeshi Ogasawara, Toshihiro Kamei, Youichi Sakakibara, Satoshi Suda, Kenji Kintaka, Hitoshi Kawashima, Makoto Okano, Toshifumi Hasama, Hiroshi Ishikawa, and Masahiko Mori, "Ultrafast nonlinear effects in hydrogenated amorphous silicon wire waveguide," Opt. Express 18, 5668-5673 (2010)

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