研究目的
To measure the optical properties of a graphitised layer produced by excimer laser irradiation of a polycrystalline diamond surface and to calculate the electromagnetic response of diamond/graphite photon elements or metamaterials.
研究成果
The study successfully measured the optical properties of a graphitised layer on a polycrystalline diamond surface and developed a theoretical model describing the electromagnetic response of surface structures obtained using laser radiation. The calculated optical constants can be used to optimize the optical properties of the fabricated structures in a wide frequency range.
研究不足
The study did not account for the dispersion of the refractive index in the considered range and the two-phonon absorption in diamond in the region of ~2000 cm–1. The condition w << g (Hagen–Rubens regime) was satisfied in the entire range of the analyzed frequencies.
1：Experimental Design and Method Selection:
The study involved measuring the optical properties of a graphitised layer on a polycrystalline diamond surface using excimer laser irradiation. The Drude model was used to calculate the electromagnetic response.
2：Sample Selection and Data Sources:
The substrate was a polished plate of polycrystalline diamond grown by chemical vapour deposition. The graphitised layer was produced using an excimer KrF laser.
3：List of Experimental Equipment and Materials:
Excimer KrF laser (Optosystems Ltd., CL 7100), Bruker IFS113v Fourier infrared spectrometer, Specord M400 spectrometer, 'Epsilon' monochromatic spectrometer, and a backward wave oscillator.
4：Experimental Procedures and Operational Workflow:
The diamond surface was graphitised using laser irradiation in a projection irradiation scheme. Optical transmission spectra were measured in the frequency range of 30–1000 cm–
5：Data Analysis Methods:
The optical properties were analyzed using the Drude conductivity model, with fitting values of damping and plasma frequency.
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