Quasi-Cherenkov Radiation from Relativistic Particles Passing Through a Photonic Crystal

TL;DR

This paper derives the spectral-angular distribution of quasi-Cherenkov radiation from relativistic particles in photonic crystals, revealing anisotropic properties and high intensity in terahertz and optical ranges suitable for experimental observation.

Contribution

It provides the first detailed derivation of spectral-angular distribution for quasi-Cherenkov radiation in photonic crystals, highlighting anisotropic effects and potential for experimental studies.

Findings

Radiation exhibits anisotropic intensity depending on crystal rotation.

High radiation intensity in terahertz and optical ranges.

Derived spectral-angular distribution expressions for the phenomenon.

Abstract

The expressions for spectral-angular distribution of quasi-Cherenkov radiation emitted by a relativistic particle traversing a photonic crystal are derived. It is shown that for a relativistic particle, passing through a photonic crystal formed by periodically strained threads, the intensity of quasi-Cherenkov radiation emitted at small angles to the direction of particle motion, as contrasted to ordinary Cherenkov radiation, exhibits anisotropic properties as the the photon momentum is rotated about the direction of particle motion (as the crystal is rotated about the direction of particle motion at fixed-angle observation of the outcoming photon). The intensity of quasi-Cherenkov radiation in terahertz and optical ranges is shown to be high enough to allow the experimental study of quasi-Cherenkov radiation in these frequency ranges.