English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

A macroscopic theory of polaritons and long optical phonons in biaxial finite ionic crystals is presented. For the case of a crystal plate it is shown that the dispersion of surface and bulk polaritons is determined by a system of nonlinear equations. These equations may be combined to an explicit dispersion formula only for propagation directions parallel to the principal axes of the dielectric tensor of the crystal.

Theorie der Polaritonen in zweiachsigen endlichen Ionenkristallen / Theory of Polaritons in Biaxial Finite Ionic Crystals