Influence of Intrinsic Electronic Properties on Light Transmission through Subwavelength Holes on Gold and MgB2 Thin Films

TL;DR

This paper investigates how intrinsic electronic properties of gold and MgB2 thin films affect light transmission through subwavelength holes in the THz regime, highlighting the role of temperature-dependent conductivity.

Contribution

It provides experimental and analytical insights into the influence of material conductivity changes on light transmission, especially considering superconducting effects in MgB2.

Findings

Transmission varies with temperature and conductivity.

Skin depth and resonator models explain the transmission behavior.

Efficiency of temperature control depends on frequency and energy gap ratio.

Abstract

We show how intrinsic material properties modify light transmission through subwavelength hole arrays on thin metallic films in the THz regime. We compare the temperature-dependent transmittance of Au films and MgB$_{2}$ films. The experimental data is consistent with analytical calculations, and is attributed to the temperature change of the conductivity of both films. The transmission versus conductivity is interpreted within the open resonator model when taking the skin depth into consideration. We also show that the efficiency of this temperature control depends on the ratio of the transmission peak frequency to the superconducting energy gap in MgB$_{2}$ films.