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We propose the design of a planar dielectric metasurface to overcome the ohmic loss and discrete phase profile of metallic metasurfaces. The proposed metasurface is composed of annular subwavelength gratings, which can be taken regard as a space-variant Pancharatnam–Berry phase optical element. Consequently, the OAM-carrying beams with topological charge ℓ = ±2 is generated with the efficiency high...
We show that the linear polarization state of electromagnetic waves at near-infrared frequencies can be efficiently rotated to its orthogonal direction by an alternative design of anisotropic plasmonic meta-surfaces. Numerical results demonstrate that the reflection coefficient converting to cross polarization after reflection can be as high as ~96 % with a half-powered bandwidth ~40 % at the wavelength...
We theoretically present a high figure of merit (FOM) tunable surface plasmon resonance sensor device by using multiple resonance modes generated from a prism-based thin metallic grating structure at the oblique incidence in this paper. This sensor includes a thin gold film periodically pierced by narrow nanostructured slits deposited on the prism structure. The excitation of Fano-like resonance in...
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