Abstract
A new approach to THz metamaterial structures is proposed and experimentally realized. It is based on metal-less conductive subwavelength structures on diamond surfaces generated by laser direct-write. 200 nm thick graphitized layers with DC conductivity of 730 Ω−1 cm−1 are formed on a chemical vapour deposited polycrystalline diamond surface after irradiation with an excimer KrF laser (τl = 20 ns, λ = 248 nm). The optical properties of such layers are determined and simulated according to the Drude model. A polarizer with a graphitized subwavelength grating is fabricated and tested in the THz range (0.9–1.2 THz), and shows different transmission losses for orthogonal polarizations.
Published Version
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