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Interface and surface polaritons of semiinfinite biaxial crystals
Author(s) -
Borstel G.
Publication year - 1973
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220600146
Subject(s) - polariton , dispersion relation , interface (matter) , crystal (programming language) , tensor (intrinsic definition) , condensed matter physics , uniaxial crystal , dielectric , materials science , symmetry (geometry) , wave vector , dispersion (optics) , character (mathematics) , surface (topology) , physics , optics , geometry , optical axis , mathematics , quantum mechanics , computer science , optoelectronics , molecule , gibbs isotherm , lens (geology) , programming language
Interface and surface polaritons of an arbitrary semiinfinite crystal cut of biaxial symmetry are investigated. It is shown that regular interface modes can occur only for certain orientations of the propagation vector or special crystal cuts. From energy flow considerations it is found that ordinary interface modes can exist only if the two‐dimensional propagation vector ( k x , k y ) is along a principal axis of the dielectric tensor. In uniaxial crystals two different types of interface polaritons are found to occur. The first is a regular and real interface mode whose dispersion relation depends neither on the crystal cut nor on the direction of propagation. The second is a generalized interface mode which may have real or virtual character.