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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Stephen A. Burns
  • Vol. 25, Iss. 5 — May. 1, 2008
  • pp: 1098–1103

Out-of-plane diffraction of a two-dimenisonal photonic crystal with finite dielectric modulation

G. Alagappan, X. W. Sun, and M. B. Yu  »View Author Affiliations


JOSA A, Vol. 25, Issue 5, pp. 1098-1103 (2008)
http://dx.doi.org/10.1364/JOSAA.25.001098


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Abstract

We present a generalized picture of out-of-plane diffraction in a two-dimensional photonic crystal using the concept of photonic bands and employing a three-dimensional, equal-frequency-surface analysis. We show that the discrete spots of diffraction pattern in a weakly modulated photonic crystal, including those of conventional diffraction gratings, become continuous when the dielectric modulation becomes finite. Furthermore, in a finite-modulated photonic crystal, the diffraction can take place even in the region prohibited by Bragg’s law: there are available states for the incident light, which are evanescent in the case of a diffraction grating (weakly modulated photonic crystal).

© 2008 Optical Society of America

OCIS Codes
(050.0050) Diffraction and gratings : Diffraction and gratings
(050.5298) Diffraction and gratings : Photonic crystals

ToC Category:
Diffraction and Gratings

History
Original Manuscript: September 18, 2007
Revised Manuscript: March 2, 2008
Manuscript Accepted: March 7, 2008
Published: April 21, 2008

Citation
G. Alagappan, X. W. Sun, and M. B. Yu, "Out-of-plane diffraction of a two-dimenisonal photonic crystal with finite dielectric modulation," J. Opt. Soc. Am. A 25, 1098-1103 (2008)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-25-5-1098

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