Fluorescence by a polar quantum system in a polychromatic field

TL;DR

This paper investigates the spectral properties of fluorescence in a polar two-level quantum system under polychromatic excitation, revealing controllable spectral modifications and transistor-like behavior with potential experimental applications.

Contribution

It introduces a model of a polar quantum system under polychromatic fields, analyzing spectral control and optoelectronic effects not previously explored.

Findings

Spectral properties can be tuned by adjusting low-frequency field intensity.

The system exhibits a transistor-like fluorescent behavior.

Potential for experimental detection and practical applications.

Abstract

Spectral properties of fluorescent radiation from a two-level quantum system with broken inversion spatial symmetry, which can be described by a model of an one-electron two-level atom whose electric dipole moment operator has permanent unequal diagonal matrix elements, were studied. The case of the excitation of this system by a polychromatic laser field, comprised of $N-1$ high-frequency components with the frequencies close to or being in resonance with the atomic transition frequency, and a low-frequency component whose frequency coincides with the Rabi frequency of the high-frequency components, was considered. Special attention was given to the resonant bichromatic and nearly resonant trichromatic excitation. In the former case it was shown that by changing the intensity of the low-frequency component, one can efficiently alter spectral properties of the fluorescent radiation of the system in the high-frequency range, while in the latter case it was found that the fluorescent behavior of the system in question reveals a kind of an optoelectronic transistor effect. Options for the experimental detection and practical usage of the effects under study were discussed.