Waveguide effect under 'antiguiding' conditions in graded anisotropic media

A new wave confinement effect is predicted in graded crystals with a concave slowness surface under conditions of growth of the phase velocity with decreasing distance from the waveguide axis. This finding overturns the common notion about the guiding and 'antiguiding' profiles of wave vel...

Full description

Saved in:
Bibliographic Details
Published in:Journal of physics. Condensed matter 2010-02, Vol.22 (7), p.075401-075401
Main Authors: Kozlov, A V, Mozhaev, V G, Zyryanova, A V
Format: Article
Language:English
Subjects:
Acoustics
Anisotropy
Models, Theoretical
Sound
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A new wave confinement effect is predicted in graded crystals with a concave slowness surface under conditions of growth of the phase velocity with decreasing distance from the waveguide axis. This finding overturns the common notion about the guiding and 'antiguiding' profiles of wave velocity in inhomogeneous media. The waveguide effect found is elucidated by means of ray analysis and particular exact wave solutions. The exact solution obtained for localized flexural waves in thin plates of graded cubic and tetragonal crystals confirms the predicted effect. Since this solution is substantially different with respect to the existence conditions from all others yet reported, and it cannot be deduced from the previously known results, the predicted waves can be classified as a new type of waveguide mode in graded anisotropic media. Although the concrete calculations are given in the article for acoustic waves, its general predictions are expected to be valid for waves of various natures, including spin, plasma, and optical waves.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/22/7/075401