Optical transition radiation in presence of acoustic waves for an oblique incidence

TL;DR

This paper studies how ultrasonic acoustic waves affect the intensity, polarization, and spectral-angular distribution of forward transition radiation from relativistic electrons incident obliquely on a superlattice, revealing controllable resonance peaks.

Contribution

It derives formulas for electromagnetic fields in the presence of acoustic waves and demonstrates how these waves create tunable resonance peaks in the radiation spectrum.

Findings

Acoustic waves induce new resonance peaks in radiation spectra.

Peak positions and heights are controllable via acoustic wave parameters.

Numerical examples provided for fused quartz plates.

Abstract

Forward transition radiation is considered in an ultrasonic superlattice excited in a finite thickness plate under oblique incidence of relativistic electrons. We investigate the influence of acoustic waves on both the intensity and polarization of the radiation. In the quasi-classical approximation, formulas are derived for the vector potential of the electromagnetic field and for the spectral-angular distribution of the radiation intensity. It is shown that the acoustic waves generate new resonance peaks in the spectral and angular distributions. The heights and the location of the peaks can be controlled by choosing the parameters of the acoustic wave. The numerical examples are given for a plate of fused quartz.