Optical transition radiation in presence of acoustic waves

TL;DR

This paper investigates how ultrasonic superlattices affect optical transition radiation from relativistic electrons, revealing tunable resonance peaks in the radiation's spectral and angular distribution due to acoustic waves.

Contribution

It derives formulae for electromagnetic fields and radiation distribution in the presence of acoustic waves, showing how to tune resonance peaks via acoustic parameters.

Findings

Acoustic waves create new resonance peaks in radiation distribution.

Peak heights can be controlled by acoustic wave parameters.

Resonance effects depend on superlattice and electron properties.

Abstract

Transition radiation from relativistic electrons is investigated in an ultrasonic superlattice excited in a finite thickness plate. In the quasi-classical approximation formulae are derived for the vector potential of the electromagnetic field and for the spectral-angular distribution of the radiation intensity. The acoustic waves generate new resonance peaks in the spectral and angular distribution of the radiation intensity. The heights of the peaks can be tuned by choosing the parameters of the acoustic wave.