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Superprism effect in a metal-clad terahertz photonic crystal slab

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Abstract

We report an experimental demonstration of the superprism effect in a photonic crystal slab at terahertz frequencies. For a 10% frequency variation around 0.28THz, the refraction angle at the output facet of a wedge-shaped photonic crystal varies by about 15°. A comparison with the predictions of a band structure calculation demonstrates that a three-dimensional treatment, accurately modeling the finite slab thickness and the metallic boundary conditions, is required for even a qualitative agreement with the experimental observations.

© 2007 Optical Society of America

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