  Thin structured surfaces allow flexible control over propagation of
electromagnetic waves. Focusing and polarization state analysis are among
functions, required for effective manipulation of radiation. Here a
polarization sensitive Fresnel zone plate lens is proposed and experimentally
demonstrated for GHz spectral range. Two spatially separated focal spots for
orthogonal polarizations are obtained by designing metasurface pattern, made of
overlapping tightly packed cross and rod shaped antennas with a strong
polarization selectivity. Optimized subwavelength pattern allows multiplexing
two different lenses with low polarization crosstalk on the same substrate and
provides a control over focal spots of the lens only by changing of the
polarization state of the incident wave. More than a wavelength separation
between the focal spots was demonstrated for a broad spectral range, covering
half a decade in frequency. The proposed concept could be straightforwardly
extended for THz and visible spectra, where polarization-sensitive elements
utilize localized plasmon resonance phenomenon.
