Spatial filtering using dielectric photonic crystals at beam-type excitation

Date
2010-12-06
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Source Title
Journal of Applied Physics
Print ISSN
0021-8979
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Publisher
American Institute of Physics
Volume
108
Issue
11
Pages
113106-1 - 113106-8
Language
English
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Abstract

Spatial filtering is demonstrated at beam-type excitations by utilizing finite thickness slabs of two-dimensional dielectric photonic crystals (PCs) showing exotic Fabry-Perot resonances that are preserved over a wide range of variation of the incidence angle. Bandstop and dual-bandpass filtering effects are illustrated theoretically and the corresponding filters are validated in the microwave experiments by using square-lattice PCs. It is shown that the basic transmission features that were observed earlier for a plane-wave illumination are also recognizable at beam-type excitations. The proposed spatial filtering mechanism exhibits directional beaming. The desired widths and the locations of the passbands and stopbands are attainable in the angle domain with a proper choice of the operating frequency for the given excitation characteristics.

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