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Two-dimensional photonic crystals with anisotropic unit cells imprinted from poly(dimethylsiloxane) membranes under elastic deformation

Appl. Phys. Lett. 93, 161911 (2008); doi:10.1063/1.3006061

Published 24 October 2008

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Xuelian Zhu,1 Ying Zhang,1 Dinesh Chandra,1 Shih-Chieh Cheng,1 James M. Kikkawa,2 and Shu Yang1
1Department of Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, Pennsylvania 19104, USA
2Department of Physics and Astronomy, University of Pennsylvania, 209 South 33rd Street, Philadelphia, Pennsylvania 19104, USA
We study structural symmetries of two-dimensional (2D) photonic crystals with anisotropic unit cells, including square- and rectangular-lattices with orientationally modulated elliptic motifs, and a compound structure consisting of circles with sixfold rotational symmetry and elliptical lines with twofold symmetry, which are created through elastic deformation of a single elastomeric membrane with circular pores. We then investigate the photonic bandgap (PBG) properties of the corresponding 2D Si posts and their tolerance to the structural deviation. We find that in the compound structure the overall PBGs are dominated by the sublattice with a higher symmetry, while the total symmetry is determined by the one with a lower symmetry. ©2008 American Institute of Physics
History: Received 20 August 2008; accepted 1 October 2008; published 24 October 2008
Permalink: http://link.aip.org/link/?APPLAB/93/161911/1
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KEYWORDS and PACS

Keywords
PACS
  • 42.70.Qs
    Photonic bandgap materials
  • 61.50.Ah
    Theory of crystal structure, crystal symmetry; calculations and modeling
  • 81.40.Jj
    Elasticity and anelasticity, stress-strain relations
  • 62.20.D-
    Elasticity of solids
  • YEAR: 2008

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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REFERENCES (14)
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