A Planar Bessel lens with non-Diffraction Beam Deflection based on Metasurfaces

Abstract

A planar Bessel lens has been proposed for non-diffraction beam deflection, which is composed of a planar flat lens and an asymmetric gradient refractive index lens. According to the desired refractive index distribution of the two lens, the metasurfaces, consisting of sub-wavelength metallic square rings with different sizes are optimally arranged. Due to the planar Bessel lens, a surface cylindrical wave radiated from a point source is converted to an inclined non-diffraction surface wave. The planar Bessel lens is fabricated, and the measurement shows good agreement with the full-wave simulation, which verifies the correctness of the design.