Abstract
In this paper, we demonstrate the concept of simultaneous controlling of the phase and the polarization handedness of a circularly polarized (CP) incident beam over an array of bilayer double split-loop resonators (DSLRs). The physical parameters are optimized by means of the finite-difference time-domain method in such a way that each unit-cell exhibits the half-wave-plate response. By simply rotating the unit-cell, the phase shift of the transmitted cross polarized beam can be controlled in the range of without any restrictions. This plasmonic metasurface provides optimal cross polarization transmission efficiency () at 1.55 μm wavelength. An array of DSLRs with helicity dependency and spatially varying phase response offers the possibility of designing anomalous bending and bifunctional (convergence/divergence) metasurfaces in which the bending direction and convergence/divergence feature can be directly controlled by the handedness of the impinging CP wave. Furthermore, a metalens with the capability of converting a CP Gaussian beam into a uniform irradiance profile (flat-top beam) is designed, and the performance of structure is evaluated in detail. All the designs are composed of the same DSLR elements with space-variant orientations.
© 2016 Optical Society of America
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