Microscopic optical fields and mixing coefficients of X-ray and optical frequencies in solids

Arya, Karamjeet ; Jha, Sudhanshu S. (1974) Microscopic optical fields and mixing coefficients of X-ray and optical frequencies in solids Pramana - Journal of Physics, 2 (3). pp. 116-125. ISSN 0304-4289

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Official URL: http://www.ias.ac.in/j_archive/pramana/2/3/116-125...

Related URL: http://dx.doi.org/10.1007/BF02847322

Abstract

Simple approximation schemes are developed to calculate induced optical fields and local field corrections to the linear optical dielectric function in metals like aluminium and in insulators like germanium. In these calculations, the unperturbed electronic states in Ge are described within the framework of the bonding orbital approach, whereas the nearly-free-electron approximation is used for Al. As expected, explicit numerical calculations show that the contribution to secondary longitudinal induced fields is more appreciable in Ge. The second order susceptibility describing the non-linear mixing of an optical frequency with an x-ray frequency, which depends upon the magnitude of the microscopic induced optical charge density, is also calculated for these solids. For most relevant wavevectors of secondary optical fields, it is found to be of the order of 10-12 esu in Ge and 10-14 esu in Al.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Microscopic Fields; Local Field Corrections; Bilinear Susceptibility; Germanium; Aluminium
ID Code:66495
Deposited On:24 Oct 2011 09:06
Last Modified:18 May 2016 14:00

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