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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 6 — Mar. 16, 2009
  • pp: 4903–4912

Polarization-independent self-collimation based on pill-void photonic crystals with square symmetry

Yi Xu, Xiao-Jun Chen, Sheng Lan, Qiao-Feng Dai, Qi Guo, and Li-Jun Wu  »View Author Affiliations

Optics Express, Vol. 17, Issue 6, pp. 4903-4912 (2009)

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We investigate discrepancy and similarity in dispersion relations between transverse-electric (TE) and transverse-magnetic (TM) polarizations in rectangular, square and triangular two-dimensional photonic crystals. It is found that the square lattice is the most appropriate candidate to realize polarization-independent, i.e. absolute self-collimation (ASC) in the first photonic band since it possesses not only a relatively broad angular range for self-collimation but also a small difference in dispersion relations between TE and TM modes. By tailoring the shape of air voids in the square-lattice-based structure, the electric-field vector can be rotated to reduce the discrepancy between TE and TM modes whereby the frequency bandwidth of ASC can be enlarged to ~4.8%. The ASC phenomenon is demonstrated by numerical experiments based on a finite-difference time-domain (FDTD) technique with negligible propagation losses.

© 2009 Optical Society of America

OCIS Codes
(120.1680) Instrumentation, measurement, and metrology : Collimation
(230.0230) Optical devices : Optical devices
(050.5298) Diffraction and gratings : Photonic crystals

ToC Category:
Photonic Crystals

Original Manuscript: January 27, 2009
Revised Manuscript: March 6, 2009
Manuscript Accepted: March 9, 2009
Published: March 13, 2009

Yi Xu, Xiao-Jun Chen, Sheng Lan, Qiao-Feng Dai, Qi Guo, and Li-Jun Wu, "Polarization-independent self-collimation based on pill-void photonic crystals with square symmetry," Opt. Express 17, 4903-4912 (2009)

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