Spectral negative refraction and focusing analysis of a two-dimensional left-handed photonic crystal lens

Date
2004-11
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Source Title
Physical Review B - Condensed Matter and Materials Physics
Print ISSN
0163-1829
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Publisher
American Physical Society
Volume
70
Issue
20
Pages
1 - 5
Language
English
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Abstract

We report the spectral refraction analysis and focusing properties of a two-dimensional, dielectric photonic crystal (PC) slab in freespace. A transverse electric polarized upper band of the crystal is used. The measured refraction spectra indicates that a highly isotropic negative index of refraction is present in the measured frequency range of the band. We demonstrate experimentally and numerically the focusing of the field emitted from an omnidirectional source placed in front of the crystal. Both the source and the focus pattern are away from the PC interfaces of the order of several wavelengths. The focus pattern mimics the arbitrary lateral and longitudinal shifts of the source, which is a manifestation of true flat lens behavior.

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