Spatial filtering using dielectric photonic crystals at beam-type excitation
Cakmak, A. O.
Serebryannikov, A. E.
Journal of Applied Physics
American Institute of Physics
113106-1 - 113106-8
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Please cite this item using this persistent URLhttp://hdl.handle.net/11693/22078
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.