Optically transparent microwave polarizer based on quasi-metallic graphene
An optically transparent graphene-based wire-grid polarizer for operating at microwave frequencies (X band) has a glass substrate having multiple strips or layers of SOCl 2 doped graphene. The strips are separated by portions of the glass substrate such that the strips are arranged in parallel. The SOCl 2 doped graphene strips have a quasi-metallic quality allowing for the transmission of an electric field with horizontal polarization in the horizontal direction while reflecting the vertical portion of the electric field.
1. A microwave polarizer, comprising:
a glass substrate;
a plurality of SOCl 2 doped graphene layers, and wherein:
said plurality of SOCl 2 doped graphene layers is arranged on the top of said glass substrate so as to form a sheet and are separated by portions of said glass substrate such that said plurality of SOCl 2 doped graphene layers are in parallel with one another; and
wherein each layer of said plurality of SOCl 2 doped graphene layers is about 1 nm thick, said plurality of SoCl 2 doped graphene layers comprises at least four SOCl 2 doped graphene layers, and each layer of said plurality of SOCl 2 doped graphene layers has a hole concentration greater than 10 12 cm −2 .
2. A microwave polarizer according to claim 1 , wherein:
the sheet formed by said plurality of SoCl 2 doped graphene layers and said glass substrate has a sheet resistance R s range between 10 Ω/sq and 2 kΩ/sq.
3. A microwave polarizer according to claim 1 , wherein:
said plurality of SoCl 2 doped graphene layers have a quasi-metallic quality allowing for the transmission of an electric field with horizontal polarization in the horizontal direction while reflecting a vertical electric field.