Comment on “Stimulated Raman scattering of laser from periodically spaced nanoparticles” [Phys. Plasmas 16, 093106 (2009)]

Maraghechi, B.; Chakhmachi, A.
August 2010
Physics of Plasmas;Aug2010, Vol. 17 Issue 8, p084703
Academic Journal
Parashar [Phys. Plasmas 16, 093106 (2009)] studied the Raman backscattering of electromagnetic waves from nanoparticle lattice. We have demonstrated that the uncoupled dispersion curves have incorrect cutoff frequencies and the electromagnetic dispersion curves do not have correct asymptotic behavior at large frequencies. It has been shown that Parashar obtained an incorrect diagram of the growth rate for which the pump wave frequency goes below the cutoff frequency of the electromagnetic wave. Correct diagrams for the Raman backscattering as well as forward scattering are presented. It has been shown that backscattering has a larger maximum growth rate. We also found no instability if scattered radiation belongs to the lower branch of the dispersion curves.


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