Asymmetric Fabry-Perot-type transmission in photonic-crystal gratings with one-sided corrugations at a two-way coupling

buir.contributor.authorÖzbay, Ekmel
buir.contributor.orcidÖzbay, Ekmel|0000-0003-2953-1828
dc.contributor.authorSerebryannikov, A. E.en_US
dc.contributor.authorAlici, K. B.en_US
dc.contributor.authorMagath, T.en_US
dc.contributor.authorCakmak, A. O.en_US
dc.contributor.authorÖzbay, Ekmelen_US
dc.departmentNanotechnology Research Center (NANOTAM)en_US
dc.description.abstractStrongly asymmetric Fabry-Perot-type transmission arising at the two-way coupling has been studied in the case of normal incidence for slabs of two-dimensional photonic crystals (PCs) with one-sided corrugations that are made of linear isotropic materials. Comparing to the scenario of unidirectional transmission known for the structures with broken spatial inversion symmetry that requires zero order being uncoupled, in the studied mechanism zero order is either the sole order or one of the orders that may be coupled to a Floquet-Bloch mode. Contrary to the earlier studies of asymmetric transmission at the coupled zero order, structures with nondeep corrugations are considered, which allow one to combine Fabry-Perot-type total-transmission maxima with diffractions in a desired way. At a proper choice of PC lattice and corrugation parameters, higher orders can dominate in Fabry-Perot-type transmission at the noncorrugated-side illumination and also at the total-transmission maxima, whereas only zero order contributes to the transmission at the corrugated-side illumination. As a result, strong asymmetry can be obtained without uncoupling of zero order but it invokes the unidirectional contribution of higher orders. The presented results show that the entire structure can be approximately decomposed into the two independent, regular and grating (nonregular), parts whose contributions to the transmission are additive. Multiple asymmetric transmission maxima can coexist with a rather high equivalent group index of refraction. Possible applications of the studied transmission mechanism are discussed.en_US
dc.publisherAmerican Physical Societyen_US
dc.source.titlePhysical Review Aen_US
dc.subjectAsymmetric transmissionsen_US
dc.subjectCorrugation parametersen_US
dc.subjectFloquet-Bloch modeen_US
dc.subjectGroup indexen_US
dc.subjectIsotropic materialsen_US
dc.subjectNormal incidenceen_US
dc.subjectSpatial inversion symmetryen_US
dc.subjectTransmission mechanismsen_US
dc.subjectTwo-dimensional photonic crystalsen_US
dc.subjectTwo-way couplingen_US
dc.subjectZero orderen_US
dc.subjectDiffraction gratingsen_US
dc.subjectRefractive indexen_US
dc.subjectFabry-perot interferometersen_US
dc.titleAsymmetric Fabry-Perot-type transmission in photonic-crystal gratings with one-sided corrugations at a two-way couplingen_US


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