Light Amplification in Semiconductor-Superconductor Structures

TL;DR

This paper explores a novel two-photon gain effect in semiconductor-superconductor structures, revealing broadband enhancement and potential for coherent control in optoelectronic devices.

Contribution

It introduces a quantum-optical model for two-photon gain in superconductor-semiconductor systems, highlighting broadband enhancement and the approach of two-photon gain to one-photon gain at high seed intensities.

Findings

Broadband enhancement of two-photon gain in superconductor structures

Two-photon gain approaches one-photon gain at high seed intensities

Insights into nonlinear light-matter interactions in superconducting states

Abstract

We study a new effect of Cooper-pair-based two-photon gain in semiconductor-superconductor structures, showing broadband enhancement of ultrafast two-photon amplification. We further show that with the superconducting enhancement, at moderately high seed intensities the two-photon gain contribution approaches that of the one-photon gain. A full quantum-optical model of singly- and fully-stimulated two-photon emission is developed. Our results provide new insights on nonlinear light-matter interaction in the superconducting state, including the possibility of coherent control in two-photon semiconductor-superconductor devices. The theoretically demonstrated effects can have important implications in optoelectronics and in coherent control applications.