Anisotropic behaviour of transmission through thin superconducting NbN film in parallel magnetic field

TL;DR

This study investigates how terahertz wave transmission through a thin NbN superconductor film varies with temperature and magnetic field orientation, revealing polarization-dependent differences in transmitted intensity.

Contribution

It presents novel experimental insights into the anisotropic transmission properties of NbN superconducting films under parallel magnetic fields.

Findings

Transmission differs significantly for polarizations parallel and perpendicular to the magnetic field.

Transmission varies with temperature and magnetic field strength.

Anisotropic behavior is confirmed in the terahertz regime.

Abstract

Transmission of terahertz waves through a thin layer of the superconductor NbN deposited on an anisotropic R-cut sapphire substrate is studied as a function of temperature in a magnetic field oriented parallel with the sample. A significant difference is found between transmitted intensities of beams linearly polarized parallel with and perpendicular to the direction of applied magnetic field.