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Comment on “Investigations of solid state, optical, NLO, dielectric and mechanical behaviour of Methyl para-Hydroxybenzoate crystal [Optik − International Journal for Light and Electron Optics 226 (2021) 165738]”
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Comment on “Investigations of solid state, optical, NLO, dielectric and mechanical behaviour of Methyl para-Hydroxybenzoate crystal [Optik − International Journal for Light and Electron Optics 226 (2021) 165738]”

K.A. Aly
Optik (Stuttgart), Vol.248, p.168067
12/2021
DOI: https://doi.org/10.1016/j.ijleo.2021.168067

Abstract

Dielectrics Index of refraction Non-linear optics Optical conductivity
In the literature a widely spread equation to correlate between the optical (σoptic) and electrical (σelec) conductivities in the form of (σelec=2λσoptα). Unfortunately, the tow sides of this equation have different dimensions i.e this equation is incorrect and the work by this equation must be stopped. The calculation of electrical/optical conductivity should be limited to the correct forms only deduced from the correct solution of Maxwell's equations.

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