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

Takasumi Tanabe, Masaya Notomi, Eiichi Kuramochi, Hideaki Taniyama

研究成果: Article査読

50 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)7826-7828
ページ数3
ジャーナルOptics Express
15
12
DOI
出版ステータスPublished - 2007 6月 11
外部発表はい

ASJC Scopus subject areas

  • 原子分子物理学および光学

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