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OPTICS EXPRESS
Volume 12, Issue 13, Pages 2919-2924Publisher
OPTICAL SOC AMER
DOI: 10.1364/OPEX.12.002919
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We demonstrate unrestricted superlensing in a triangular two-dimensional photonic crystal. We investigate simple two-point light sources imaged by a slab lenses made of this photonic crystal, and show that the refraction of light follows simple rules of geometric optics with the Snell's-law refraction at each interface, and an effective isotropic refractive index n = -1 for light propagating inside the crystal. We contrast this behavior with that of a square two-dimensional photonic crystal in the first photonic band, where the effective dielectric response is anisotropic. This leads to a restricted superlensing, which does not follow the geometric optics. (C) 2004 Optical Society of America.
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