Optically transparent metasurface for orbital angular momentum beam generation

This paper presents the design for an optically transparent transmissive 1-bit metasurface to generate an orbital angular momentum (OAM) beam of mode 1. A transparent acrylic sheet was used as the substrate along with a low sheet resistance (≈2.4Ω/□) Indium Tin Oxide (ITO) film as a conductor. Their dielectric and conductor properties were characterized using split post and single post dielectric resonator, respectively. A 15×15 metasurface was designed in simulation, which when fed with a generic horn antenna to produce an OAM beam of mode 1 at 10.5 GHz in the boresight direction.