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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 16 — Aug. 6, 2007
  • pp: 10274–10281

Experimental observation of slow light in photonic crystal coupled waveguides

Takashi Kawasaki, Daisuke Mori, and Toshihiko Baba  »View Author Affiliations

Optics Express, Vol. 15, Issue 16, pp. 10274-10281 (2007)

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We experimentally demonstrate wideband dispersion-free slow light in chirped photonic crystal coupled waveguides (PCCW). In unchirped PCCWs, the zero group velocity can occur at an inflection point of a photonic band of even symmetric mode. The even symmetric mode is selectively excited by connecting the device with input and output waveguides through optimized branch and confluence structures. In the device fabricated on SOI substrate, a large increase in group delay was observed with a maximum group index of 140 and the zero group velocity dispersion at the inflection point. Photonic bands estimated from the group delay characteristics corresponded to calculated ones. In the chirped PCCWs, the group velocity dispersion was internally compensated and the nearly constant group index of 50–60 was obtained in a wavelength bandwidth of 10 nm. The dispersion compensation was also confirmed through the transmission measurement of sub-ps optical pulses.

© 2007 Optical Society of America

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(230.3990) Optical devices : Micro-optical devices

ToC Category:
Slow Light

Original Manuscript: June 8, 2007
Revised Manuscript: July 25, 2007
Manuscript Accepted: July 25, 2007
Published: July 30, 2007

Takashi Kawasaki, Daisuke Mori, and Toshihiko Baba, "Experimental observation of slow light in photonic crystal coupled waveguides," Opt. Express 15, 10274-10281 (2007)

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  1. T. Baba, N. Fukaya, and J. Yonekura, "Observation of light transmission in photonic crystal waveguides with bends," Electron. Lett. 35, 654-655 (1999). [CrossRef]
  2. T. Baba, A. Motegi, T. Iwai, N. Fukaya, Y. Watanabe and A. Sakai, "Light propagation characteristics of straight single line defect optical waveguides in a photonic crystal slab fabricated into a silicon-on-insulator substrate," Japan.Quantum. Electron. 38, 743-752 (2002). [CrossRef]
  3. S. J. McNab, N. Moll, and Y. Vlasov, "Ultra-low loss photonic integrated circuit with membrane-type photonic crystal waveguides," Opt. Express 11, 2927-2939 (2003). [CrossRef] [PubMed]
  4. Y. Sugimoto, Y. Tanaka, N. Ikeda, Y. Nakamura, K. Asakawa, and K. Inoue, "Low propagation loss of 0.76 dB/mm in GaAs-based single-line-defect two-dimensional photonic crystal slab waveguides up to 1 cm in length," Opt. Express 12, 1090-1096 (2004). [CrossRef] [PubMed]
  5. E. Kuramochi, M. Notomi, S. Hughes, A. Shinya, T. Watanabe, and L. Ramunno, "Disorder-induced scattering loss of line-defect waveguides in photonic crystal slabs" Phys. Rev. B 72, 161318 (2005). [CrossRef]
  6. M. Notomi, K. Yamada, A. Shinya, J. Takahashi, C. Takahashi, and I. Yokohama, "Extremely large group-velocity dispersion of line defect waveguides in photonic crystal slabs," Phys. Rev. Lett. 87, 253902 (2001). [CrossRef] [PubMed]
  7. K. Inoue, N. Kawai, Y. Sugimoto, N. Carlsson, N. Ikeda, and K. Asakawa, "Observation of small group velocity in two-dimensional AlGaAs-based potonic crystal slabs" Phys. Rev. B 65, 121308 (2002). [CrossRef]
  8. T. Asano, K. Kiyota, D. Kumamoto, B-S. Song, and S. Noda, "Time-domain measurement of picosecond light-pulse propagation in a two-dimensional photonic crystal-slab waveguide," Appl. Phys. Lett. 84, 4690-4692 (2004). [CrossRef]
  9. Yu. A. Vlasov, M. O'Boyle, H. F. Hamann and S. J. McNab, "Active control of slow light on a chip with photonic crystal waveguides," Nature 438, 65-69, (2005). [CrossRef] [PubMed]
  10. H. Gersen, T. J. Karle, R. J. P. Engelen, W. Bogaerts, J. P. Korterik, N. F. van Hulst, T. F. Krauss, and L. Kuipers, "Real-space observation of ultraslow light in photonic crystal waveguides," Phys. Rev. Lett. 94, 073903 (2005). [CrossRef] [PubMed]
  11. K. Kiyota, T. Kise, N. Yokouchi, T. Ide, and T. Baba, "Various low group velocity effects in photonic crystal line defect waveguides and their demonstration by laser oscillation," Appl. Phys. Lett. 88, 201904 (2006). [CrossRef]
  12. D. Mori and T. Baba, "Dispersion-controlled optical group delay device by chirped photonic crystal waveguides," Appl. Phys. Lett. 85, 1101-1103 (2004). [CrossRef]
  13. T. Baba and D. Mori, "Slowlight engineering in photonic crystals," J. Phys. D: Appl. Phys. 40, 2659-2665 (2007). [CrossRef]
  14. A. Sakai, I. Kato, D. Mori and T. Baba, "Anomalous low group velocity and low dispersion in simple photonic crystal line defect waveguides," IEEE/LEOS Annual Meet., ThQ5 (2004).
  15. A. Y. Petrov and M. Eich, "Zero dispersion at small group velocities in photonic crystal waveguides," Appl.Phys. Lett. 85, 4866-4868 (2004). [CrossRef]
  16. M. L. Povinelli, S. G. Johnson, and J. D. Joannopoulos, "Slow-light, band-edge waveguides for tunable time delays," Opt. Express 13, 7145-7159 (2005). [CrossRef] [PubMed]
  17. D. Mori, and T. Baba, "Wideband and low dispersion slow light by chirped photonic crystal coupled waveguide," Opt. Express 13, 9398-9408 (2005). [CrossRef] [PubMed]
  18. R. J. P. Engelen, Y. Sugimoto, Y. Watanabe, J. P. Korterik, N. Ikeda, N. F. van Hulst, K. Asakawa, and L. Kuipers, "The effect of higher-order dispersion on slow light propagation in photonic crystal waveguides, " Opt. Express 14, 1658-1672 (2006). [CrossRef] [PubMed]
  19. C. E. Finlayson, F. Cattaneo, N. M. B. Perney, J. J. Baumberg, M. C. Netti, M. E. Zoorob, M. D. B. Charlton, and G. J. Parker, "Slow light and chromatic temporal dispersion in photonic crystal waveguides using femtosecond time of light," Phys. Rev. E73, 016619 (2006). [CrossRef]
  20. L. H. Frandsen, A. V. Lavrinenko, J. Fage-Pedersen, and P. I. Borel, "Photonic crystal waveguides with semi-slow light and tailored dispersion properties," Opt. Express 14, 9444-9450 (2006). [CrossRef] [PubMed]
  21. M. D. Settle, R. J. P. Engelen, M. Salib, A. Michaeli, L. Kuipers, and T. F. Krauss, "Flatband slow light in photonic crystals featuring spatial pulse compression and terahertz bandwidth," Opt. Express 15, 219-226 (2007). [CrossRef] [PubMed]
  22. S. C. Huang, M. Kato, E. Kuramochi, C. P. Lee and M. Notomi, "Time-domain and spectral-domain investigation of inflection-point slow-light modes in photonic crystal coupled waveguides," Opt. Express 15, 3543-3549 (2007). [CrossRef] [PubMed]
  23. D. Mori, S. Kubo, H. Sasaki, and T. Baba, "Experimental demonstration of wideband dispersion-compensated slow light by a chirped photonic crystal directional coupler," Opt. Express 15, 5264-5270 (2007). [CrossRef] [PubMed]
  24. S. Kubo, D. Mori and T. Baba, "Demonstration of low-group-velocity and Low-dispersion photonic crystal waveguide," IEEE/LEOS Int. Conf. Group IV Photon., WP35 (2007).
  25. Y. Watanabe, Y. Sugimoto, N. Ikeda, N. Ozaki, A. Mizutani, Y. Takata, Y. Kitagawa and K. Asakawa, "Broadband waveguide intersection with low-crosstalk in two-dimensional photonic crystal circuits by sing topology optimization," Opt. Express 14, 9502-9507 (2006). [CrossRef] [PubMed]

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