Terahertz Radiation Power Characterization and Optimization of Stack of Intrinsic Josephson Junctions

TL;DR

This paper analyzes and optimizes terahertz radiation power from stacks of intrinsic Josephson junctions in high-Tc superconductors using numerical simulations to understand how design parameters affect power output.

Contribution

It introduces a numerical approach to optimize terahertz radiation power by analyzing the effects of geometrical and bias parameters in Josephson junction stacks.

Findings

Power increases with optimized mesa dimensions.

Magnetic and electric bias significantly influence power output.

Number of layers affects total radiated power.

Abstract

Terahertz radiation of the stack of intrinsic Josephson junctions in the mesa structure of the layered high-Tc superconductors is analyzed and presented in this work. The dependency of the radiated power to the geometrical parameters, cavity-waveguide boundaries, and magnetic and electric bias has been investigated. This has been done by numerical calculation of the previously proposed coupled sine-Gordon equations, which characterize the electromagnetic dynamics of the stack of the intrinsic Josephson junctions. Using the obtained numerical results from these coupled equations, the effect of the design parameters such as dimensions of the mesa structure and the magnitude of the applied magnetic field and the dc current on the enhancement of the radiated power is studied. Thus, the radiated power is optimized with respect to these considered parameters. By variation of the number of layers, we also investigate the effect of the number of intrinsic Josephson junctions on the total radiated power. The results from this part are also compared with the previous analytical models.