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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 13 — Jun. 25, 2007
  • pp: 7974–7983

High transmission recovery of slow light in a photonic crystal waveguide using a hetero group-velocity waveguide

Nobuhiko Ozaki, Yoshinori Kitagawa, Yoshiaki Takata, Naoki Ikeda, Yoshinori Watanabe, Akio Mizutani, Yoshimasa Sugimoto, and Kiyoshi Asakawa  »View Author Affiliations

Optics Express, Vol. 15, Issue 13, pp. 7974-7983 (2007)

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High transmission of slow-light in a photonic crystal (PC) waveguide (WG) using a hetero group-velocity (Ht-Vg) PC-WG was proposed and experimentally investigated. The Ht-Vg WG, which comprises a low-group-velocity (L-Vg) PC-WG section between two identical high-group-velocity (H-Vg) PC-WGs, is designed to decrease the impedance mismatch of the L-Vg PC-WG. The increase in transmittance of a propagating pulse was confirmed in the Ht-Vg PC-WG even in the vicinity of the band-gap, whereas the homogeneous PC-WG showed a gradual decrease in transmittance with the pulse wavelength approaching the band-gap. The group index (ng ) of the L-Vg region in the Ht-Vg PC-WG was measured by the cross-correlation method and attained a value above 20. On the other hand, the transmittance of the Ht-Vg structure recovered approximately 16dB compared to the homogeneous L-Vg WG having same ng , 17. This recovery is mainly dominated by the coupling improvement due to the Ht-Vg structure, around 12dB. These results indicate the effectiveness of the Ht-Vg structure to use slow light in a PC-WG, which leads to various applications in PC-based optical devices.

© 2007 Optical Society of America

OCIS Codes
(230.1150) Optical devices : All-optical devices
(230.3120) Optical devices : Integrated optics devices

ToC Category:
Photonic Crystals

Original Manuscript: April 2, 2007
Revised Manuscript: June 9, 2007
Manuscript Accepted: June 10, 2007
Published: June 12, 2007

Nobuhiko Ozaki, Yoshinori Kitagawa, Yoshiaki Takata, Naoki Ikeda, Yoshinori Watanabe, Akio Mizutani, Yoshimasa Sugimoto, and Kiyoshi Asakawa, "High transmission recovery of slow light in a photonic crystal waveguide using a hetero groupvelocity waveguide," Opt. Express 15, 7974-7983 (2007)

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