Spatial filtering using dielectric photonic crystals at beam-type excitation
Author
Colak, E.
Cakmak, A. O.
Serebryannikov, A. E.
Özbay, Ekmel
Date
2010-12-06Source Title
Journal of Applied Physics
Print ISSN
0021-8979
Publisher
American Institute of Physics
Volume
108
Issue
11
Pages
113106-1 - 113106-8
Language
English
Type
ArticleItem Usage Stats
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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.
Keywords
A-planeAngle domains
Band pass filtering
Band-stop
Dielectric photonic crystals
Fabry-Perot resonances
Finite thickness
Incidence angles
Microwave experiments
Operating frequency
Spatial filterings
Square-lattice
Photonic crystals