A 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 ${\lambda }_0=1.55\mathrm{\mu m}$. The operation is obtained by the achievement of the simultaneous unity transmission of transverse magnetic and transverse electric waves with a phase difference of $\pi /2$, 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 $\sim 50\%$ can be achieved when the operation bandwidth is defined as the wavelengths for which the conversion efficiency exceeds 0.9.

© 2012 Optical Society of America

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