Imaging of photonic crystal slabs with non-ideal effective refractive index

Guilin Sun; Andrew G. Kirk

doi:10.1117/12.807289

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12 August 2008 Imaging of photonic crystal slabs with non-ideal effective refractive index

Guilin Sun, Andrew G. Kirk

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Proceedings Volume 7099, Photonics North 2008; 70991B (2008) https://doi.org/10.1117/12.807289
Event: Photonics North 2008, 2008, Montréal, Canada

Abstract

Finite-sized photonic crystal slabs have an effective refractive index that differs from that calculated for infinite structures. We investigate the imaging characteristics of such slabs with nonideal effective refractive index n_eff, namely |n_eff|<1 and |n_eff|>1 at the 2nd band of hexagonal lattice, and observe an approximately linear object-image relation and saturated imaging. We focus on the slab aperture effect on imaging and analyze the mechanisms of image formation. For the finite-sized photonic crystal slab with fixed object distance, due to beam leakage, there is a limiting aperture size beyond which the image resolution and image distance remain almost unchanged. A larger aperture does not necessarily lead to higher image resolution. In order to be focused by the slab with negative refraction, the physical source or the object must contain sufficient transversal wavevectors or higher transversal spatial frequencies. The analyses are for the cases where propagating waves dominate imaging formation.

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Guilin Sun and Andrew G. Kirk "Imaging of photonic crystal slabs with non-ideal effective refractive index", Proc. SPIE 7099, Photonics North 2008, 70991B (12 August 2008); https://doi.org/10.1117/12.807289

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