Just to add a reference, an analysis of the polaritons in non cubic crystals can be found in this article.
R. Loudon, Advances in Physics, 2001, Vol. 50, No. 7, 813-864 This article was originall y published in Advances in Physics, volume 13, 1964 . It attracted 1147 citations by October 2001, and is ranked 2 in the index of articles attracting more than 100 citations. -- Eduardo Menendez Departamento de Fisica Facultad de Ciencias Universidad de Chile Phone: (56)(2)9787439 URL: http://fisica.ciencias.uchile.cl/~emenendez -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.democritos.it/pipermail/pw_forum/attachments/20110429/7f1cc878/attachment.htm
