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(a) Real and Imaginary part of dielectric permittivity for YBCO at 75 GHz. Fraction density of superconducting electrons is also shown. (b) Ratio of displacement current over conduction current of YBCO for the same parameters. (c) Normalized value of surface plasmon wave propagation length and wave localization in air over the wavelength. Gray area visualizes the possible plasmonic regime.
Experimental data (dots) vs simulation results (dashed line with dots) at temperature of 50 K, brought to the same scale for comparison reasons. Inset shows a part of the experimental setup with cryostat head in the middle and millimetric wave heads equipped with small horn antennas on both sides. Radiation screens and absorbers are removed for presentation purposes.
Experimental spectra of transmission change relative to transmission values at 300 K at three different temperatures. Inset shows a cross section of the sample’s structure.
Change in amplitude of the extraordinary transmission peak at 75.7 GHz as a function of the sample’s temperature. Red circles correspond to experimental data, while blue curve shows simulation results accordingly to the two-fluid model. Horizontal line presents the ordinary level of transmission calculated according to Bethe. Inset shows a photograph of the sample.
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