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

摘要

The expressions for spectral-angular distribution of quasi-Cherenkovradiation emitted by a relativistic particle traversing a photonic crystal arederived. It is shown that for a relativistic particle, passing through aphotonic crystal formed by periodically strained threads, the intensity ofquasi-Cherenkov radiation emitted at small angles to the direction of particlemotion, as contrasted to ordinary Cherenkov radiation, exhibits anisotropicproperties as the the photon momentum is rotated about the direction ofparticle motion (as the crystal is rotated about the direction of particlemotion at fixed-angle observation of the outcoming photon). The intensity ofquasi-Cherenkov radiation in terahertz and optical ranges is shown to be highenough to allow the experimental study of quasi-Cherenkov radiation in thesefrequency ranges.