Mutlu, M.Akosman, A. E.Özbay, Ekmel2016-02-082016-02-082012-05-300146-9592http://hdl.handle.net/11693/21445A circular polarizer, which is composed of periodic and two-dimensional dielectric high-contrast gratings, is designed theoretically such that a unity conversion efficiency is achieved at λ0 = 1.55 μm. The operation is obtained by the achievement of the simultaneous unity transmission of transverse magnetic and transverse electric waves with a phase difference of π/2, meaning that an optimized geometrical anisotropy is accomplished. By the utilization of the rigorous coupled-wave analysis and finite-difference time-domain methods, it is shown that a percent bandwidth of ∼50% can be achieved when the operation bandwidth is defined as the wavelengths for which the conversion efficiency exceeds 0.9.EnglishCircular polarizersFinite-difference time-domain (FDTD) methodsGeometrical anisotropyHigh contrastOperation bandwidthPhase differenceRigorous coupled wave analysisTransverse electric wavesTransverse magneticCircular polarizationConversion efficiencyElectromagnetic wavesFinite difference time domain methodDiffraction gratingsArticle10.1364/OL.37.002094