Properties of Extraordinary Polaritons in LiNbO3

✍ Scribed by M. Posledovich; F. X. Winter; G. Borstel; R. Claw

• Book ID: 104543926
• Publisher: John Wiley and Sons
• Year: 1973
• Tongue: English
• Weight: 498 KB
• Volume: 55
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/pssb.2220550228

✦ Synopsis

Abstract

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.