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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 12 — Jun. 11, 2007
  • pp: 7826–7839

Large pulse delay and small group velocity achieved using ultrahigh-Q photonic crystal nanocavities

Takasumi Tanabe, Masaya Notomi, Eiichi Kuramochi, and Hideaki Taniyama  »View Author Affiliations

Optics Express, Vol. 15, Issue 12, pp. 7826-7839 (2007)

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We systematically studied the spectral and temporal characteristics of wavelength-sized ultrahigh-Q photonic crystal nanocavities based on width-modulated line defects. By employing accurate measurements, we confirmed that the cavity exhibits an ultra-sharp resonance width (1.23 pm), an ultrahigh-Q (1.28×106), and an ultra-long photon lifetime (1.12 ns). We discussed the correlation between the spectral and temporal measurements for various cavities, and obtained extremely good agreement. In addition, we demonstrated photon trapping for the side-coupling configuration by employing ring-down measurement, which sheds light on another interesting aspect of this phenomenon. Finally, we performed pulse propagation experiments for samples with different waveguide-cavity coupling configurations, and achieved a smallest group velocity of about 4.6 km/s for a novel configuration. These results show that we can effectively trap and delay light by using ultra-small cavities, which can potentially increase the packing density of optical buffers and bit-shifters if applied to coupled-cavity waveguides.

© 2007 Optical Society of America

OCIS Codes
(230.3120) Optical devices : Integrated optics devices
(230.3990) Optical devices : Micro-optical devices
(230.5750) Optical devices : Resonators

ToC Category:
Photonic Crystals

Original Manuscript: March 16, 2007
Revised Manuscript: June 4, 2007
Manuscript Accepted: June 5, 2007
Published: June 8, 2007

Takasumi Tanabe, Masaya Notomi, Eiichi Kuramochi, and Hideaki Taniyama, "Large pulse delay and small group velocity achieved using ultrahigh-Q photonic crystal nanocavities," Opt. Express 15, 7826-7839 (2007)

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