Colak, E.Cakmak, A. O.Serebryannikov, A. E.Özbay, Ekmel2016-02-082016-02-082010-12-060021-8979http://hdl.handle.net/11693/22078Spatial 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.EnglishA-planeAngle domainsBand pass filteringBand-stopDielectric photonic crystalsFabry-Perot resonancesFinite thicknessIncidence anglesMicrowave experimentsOperating frequencySpatial filteringsSquare-latticePhotonic crystalsArticle10.1063/1.3498810