We report far-infrared optical properties of a thin NbN superconductor in magnetic field, B, up to 10 T. Transmission, $Tr(T,B)$, of monochromatic linearly polarized laser beam with frequency below and above an optical gap is measured both below and above Tc. $Tr(T,B=0)$ is well described by the BCS-based model that approximates the sample as a mixture of superconductors with different Tc. Tr(T,B≠0) appears qualitatively different for Voigt and Faraday geometry. To calculate optical properties, we use Bruggeman's approach and present a phenomenological model accounting for both field orientations. The model captures all observed features of the $Tr(T,B)$ data.
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Šindler et al. (2010) studied this question.
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