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

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      https://www.ias.ac.in/article/fulltext/pram/002/03/0116-0125

    • Keywords

       

      Microscopic fields; local field corrections; bilinear susceptibility; germanium; aluminium

    • 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.

    • Author Affiliations

       

      Karamjeet Arya1 Sudhanshu S Jha1

      1. Tata Institute of Fundamental Research, Bombay - 400005
    • Dates

       
  • Pramana – Journal of Physics | News

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