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Properties of Extraordinary Polaritons in LiNbO 3
Author(s) -
Posledovich M.,
Winter F. X.,
Borstel G.,
Claw R.
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.2220550228
Subject(s) - polariton , dispersion (optics) , optics , physics , wave vector , basis (linear algebra) , principal axis theorem , mathematics , geometry
On the basis of corrected assignments of the optical phonons in LiNbO 3 the dispersion branches of extraordinary polaritons have been calculated for different wave vector directions with respect to the optic axis of the material. A fundamental feature of extraordinary polaritons is the lifting of crossing points between dispersion branches for wave vector directions different from the principal directions. A first experimental observation of this effect is presented and has been compared with theoretical data. Furthermore the experiments allow a simultaneous observation of the lowest frequency ordinary and extraordinary polariton branches.