Modulation of intersubband IR absorption under intense THz irradiation

TL;DR

This paper investigates how intense terahertz radiation alters intersubband infrared absorption in quantum wells, revealing fine structure, broadening, and shifting effects through theoretical analysis.

Contribution

It provides a new theoretical framework for understanding intersubband absorption modifications under intense THz irradiation using adiabatic and resonant approximations.

Findings

Prediction of a significant fine structure in absorption spectra

Observation of broadening and shift of absorption peaks

Development of an expression for the induced current under THz irradiation

Abstract

We analyze the modification of the intersubband absorption of electrons in quantum wells under intense THz irradiation. An expression for the induced current is obtained, based on the adiabatic approach and the resonant approximation. We predict the occurrence of a significant fine structure as well as the broadening and shift of the absorption under THz pump in a MW/cm$^2$ intensity range.