Generation of surface polaritons in dielectric cylindrical waveguides

• Published in: Physical review. Accelerators and beams Vol. 22; no. 4
• Main Authors: Kotanjyan, A. S., Mkrtchyan, A. R., Saharian, A. A., Kotanjyan, V. Kh
• Format: Journal Article
• Language: English
• Published: College Park American Physical Society 11.04.2019
• Subjects: Charged particles; Cylinders; Dielectric waveguides; Dielectrics; Electromagnetic fields; Optical communication; Optical fibers; Polaritons; Radiant flux density; Radiation; Tensors
• ISSN: 2469-9888; 2469-9888
• DOI: 10.1103/PhysRevAccelBeams.22.040701

We investigate the radiation of surface polaritons by a charged particle rotating around a dielectric waveguide. The general case is considered when the waveguide is immersed in a homogeneous medium. For the evaluation of the corresponding electromagnetic fields the electromagnetic Green tensor is used. A formula is derived for the spectral distribution of the radiation intensity for surface-type modes. It is shown that the corresponding waves are radiated on the eigenmodes of the dielectric cylinder. We demonstrate that the number of radiated quanta for surface polaritons of a given harmonic can be essentially larger than that for guiding modes of the cylinder. The geometry under consideration is of interest from the point of view of generation and transmitting of waves in waveguides, a subject which is of considerable practical importance in microwave engineering and optical fiber communications.