Super terahertz transparent electrodes.

The use of DMSO-doped poly (3,4-ethylenedioxythiophene):poly (4-styrenesulfonate) (PEDOT:PSS) thin films produced by spin coating as transparent electrodes is reported. The transmittance of these electrodes at THz frequencies, as well as their surface morphology and electrical conductivity, are subsequently investigated in relation to the thickness of their DMSO-doped PEDOT:PSS film. A maximum conductivity of 5078 S/cm is obtained for a single-layer film (52 nm) doped with 15 vol% DMSO in PEDOT:PSS solution, providing a transmittance of up to 83.5% at 1.22 THz. The newly proposed blue-phase liquid crystal THz modulator provides continuous tunability and full electrical controllability at THz frequencies.