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Photon-Single Phonon Coupling at Polar Crystal Surfaces: Infrared Optical Anisotropy Spectra

Published online by Cambridge University Press:  25 February 2011

W. Luis Mochan ,
Jose Recamier ,
Guillermo Monsivais  and
Lucia Diaz Barriga
W. Luis Mochan
Affiliation:
Laboratorio de Cuernavaca, Instituto de Física, Universidad Nacional Autónoma de México, Apartado Postal 139-B, 62191 Cuernavaca Morelos, México
Jose Recamier
Affiliation:
Laboratorio de Cuernavaca, Instituto de Física, Universidad Nacional Autónoma de México, Apartado Postal 139-B, 62191 Cuernavaca Morelos, México
Guillermo Monsivais
Affiliation:
Instituto de Física, Universidad Nacional Autónoma de México, Apartado Postal 20-364, 01000 México Distrito Federal, México
Lucia Diaz Barriga
Affiliation:
Laboratorio de Cuernavaca, Instituto de Física, Universidad Nacional Autónoma de México, Apartado Postal 139-B, 62191 Cuernavaca Morelos, México
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Abstract

We extend a formalism for the calculation of the surface-induced infrared anisotropy spectra of cubic polar crystals, in order to incorporate surface relaxation, reconstruction, and in general, surface modifications to the dynamic matrix. We calculate the reflectance anisotropy of a model (110) GaAs surface. The spectra have a rich structure which can be related to critical points of the phonon dispersion relation, and to coupling to surface states and surface resonances. The results display a very large sensitivity to the surface parameters, indicating that the surface induced anisotropy can be employed as an optical surface probe in the far IR.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 236: Symposium B – Photons and Low Energy Particles in Surface Processing , 1991 , 511
Copyright
Copyright © Materials Research Society 1992

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