Superconducting THz sources with 12% power efficiency

TL;DR

This paper reports on high-efficiency THz sources using high-temperature superconductor whisker-crystals, achieving a record 12% power efficiency at 4 THz, with potential applications in tunable and compact THz devices.

Contribution

The paper introduces a novel THz source prototype based on Bi2Sr2CaCu2O8+d whisker-crystals with record high power efficiency of 12%, advancing THz technology.

Findings

Achieved 12% power efficiency at 4 THz.

Used radiative cooling for emission power evaluation.

Potential for tunable, monochromatic, compact THz sources.

Abstract

Low power efficiency is one of the main problems of THz sources, colloquially known as the THz gap. In this work we present prototypes of THz devices based on whisker-crystals of a hightemperature superconductor Bi2Sr2CaCu2O8+d with a record high radiation power efficiency of 12% at a frequency of 4 THz. We employ various on- and off-chip detection techniques and, in particular, use the radiative cooling phenomenon for accurate evaluation of the emission power. We argue that such devices can be used for creation of tunable, monochromatic, continuous-wave, compact and power-efficient THz sources.