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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 26 — Dec. 20, 2010
  • pp: 26965–26977

Study of different spectral regions and delay bandwidth relation in slow light photonic crystal waveguides

H. Kurt, K. Üstün, and L. Ayas  »View Author Affiliations


Optics Express, Vol. 18, Issue 26, pp. 26965-26977 (2010)
http://dx.doi.org/10.1364/OE.18.026965


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Abstract

We investigate slow light propagation in monomode photonic crystal waveguides with different spectral features such as constant group index, high bandwidth and low group velocity dispersion. The form of the waveguide mode alters dramatically and spans three different spectral intervals by tuning the size of the boundary holes. Namely, slope of the band gap guided mode changes sign from negative to positive toward the Brillouin zone edge. In between there is a transition region where modes have nearly zero slopes. Maximum group index occurs at these turning points at the expense of high dispersion and narrow bandwidth. The apparent trade-off relationship between group index and bandwidth is revealed systematically. We show that as the radius of the innermost hole is increased above a certain value, the former one decreases and the latter one increases both exponentially but with a different ratio. The product of average group index and bandwidth is defined as a figure of merit which reaches up to a value of approximately 0.30 after a detailed parametric search. The findings of the frequency domain analysis obtained by plane wave expansion method are confirmed via finite-difference time-domain study.

© 2010 OSA

OCIS Codes
(260.2030) Physical optics : Dispersion
(130.5296) Integrated optics : Photonic crystal waveguides
(160.5298) Materials : Photonic crystals

ToC Category:
Photonic Crystals

History
Original Manuscript: August 30, 2010
Revised Manuscript: October 27, 2010
Manuscript Accepted: December 6, 2010
Published: December 8, 2010

Citation
H. Kurt, K. Üstün, and L. Ayas, "Study of different spectral regions and delay bandwidth relation in slow light photonic crystal waveguides," Opt. Express 18, 26965-26977 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-26-26965


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