Surface dependent behaviour of CdS LO-phonon mode

In this paper, we develop a sensitive optical method to monitor the surface roughness in the investigation of surfaces. By applying this method to measure the RMS surface roughness of various surfaces, we found RMS values which are comparable to those obtained by atomic force microscopy measurements...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2007-08, Vol.40 (16), p.4922-4927
Main Authors: Molina-Contreras, J R, Medina-Gutiérrez, C, Frausto-Reyes, C, Trejo-Vázquez, R, Villalobos-Piña, F J, Romo-Luevano, G, Calixto, S
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Lattice dynamics
Phonon states and bands, normal modes, and phonon dispersion
Phonons and vibrations in crystal lattices
Physics
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Summary:In this paper, we develop a sensitive optical method to monitor the surface roughness in the investigation of surfaces. By applying this method to measure the RMS surface roughness of various surfaces, we found RMS values which are comparable to those obtained by atomic force microscopy measurements. In addition, we present a simple empirical model to calculate the RMS surface roughness which shows very good agreement with the surface roughness measurements taken by the method reported in this paper. Finally, the application of our method to the study of the LO-phonon mode of CdS suggests that its intensity is dominated by the surface roughness. This roughness dependent behaviour of the CdS LO-phonon mode is experimentally confirmed by using an excitation wavelength near its E0 transition.
ISSN:0022-3727
1361-6463
DOI:10.1088/0022-3727/40/16/025