SPIE Photonics West 2020, San Francisco, USA
February 1 - 6, 2020 (Sun. - Thur.), Moscone Centor
Polarization Independent Flat Metasurface Lens for Millimeter-Wave Beam Focusing
Wonwoo Lee, Semin Jo, Kanghyeok Lee, Hong Soo Park, Junhyuk Yang, Changkun Park, Sun K. Hong and Hojin Lee
Abstract
In this paper, we propose a new polarization independent ultra-thin (<λ/10) single-layer metasurface lens to focus incident electromagnetic waves at millimeter-wave frequency. The proposed metasurface focusing lens consists of the 13 x 13 array supercells with different shapes and sizes representing differential gradient phase at 33GHz range. In addition, each supercell could cover enough phase range to make a focal point at desired distance by arranging the discrete phase distribution for each supercell of the metasurface and controlling the phase of the scattering electromagnetic waves. To confirm the focusing characteristics, the power density distribution of scattering field at the focal plane was analyzed, and the maximum power density was formed at the focal length of 50mm which is half-wavelength distance both on x-z plane and y-z plane for incident plane wave. Base on the experimental results, we could confirm that the wavefront and electromagnetic wave could be successfully manipulated and focused. We expect that the proposed ultrathin and high-efficiency metasurface lens can be widely used in various millimeter-wave applications.
