Optical properties of laser-modified diamond: From visible to microwave range

We have measured the optical properties of a graphitised layer with dc conductivity of 305 Ω⁻¹ cm⁻¹ produced by excimer laser irradiation (KrF, τ = 20 ns, λ = 248 nm) of a polycrystalline diamond surface grown by chemical vapour deposition. Studies have been conducted in a wide range of wavelengths: from far-IR to visible spectral regions. The resulting constants of the Drude model are the basic parameters for calculating the electromagnetic response of diamond/graphite photon elements or metamaterials fabricated using the direct laser writing method. (paper)