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Phys Rev Lett. 2001 Feb 19;86(8):1526-9.

Optical trirefringence in photonic crystal waveguides.

Netti MC, Harris A, Baumberg JJ, Whittaker DM, Charlton MB, Zoorob ME, Parker GJ.

Source

Department of Physics & Astronomy, University of Southampton, SO17 1BJ, United Kingdom.

Abstract

We demonstrate that 2D photonic crystals can possess optical trirefringence in which there are six field orientations for which linear incident light is not perturbed on reflection or transmission. Such a property is rigorously forbidden in homogeneous nonmagnetic dielectrics which can possess only optical birefringence. We experimentally demonstrate this phenomena in silicon-based mesostructures formed from photonic crystal waveguides embedded in a Fabry-Perot cavity. Multirefringence is controlled by the presence of submicron dielectric patterning and is well explained by an exact scattering matrix theory.