Low-frequency laser spectroscopy of cylindrical nanoparticle suspensions

A theory of generation of anti-Stokes radiation on the eigenvibrations in a suspension of cylindrical nanoparticles in the field of two copropagating electromagnetic pump waves has been developed. Surface ponderomotive forces are shown to induce acoustic vibrations and dipolemoments of nanoparticles...

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Bibliographic Details
Published in:Physics of wave phenomena 2017-10, Vol.25 (4), p.254-258
Main Authors: Bunkin, A. F., Mikhalevich, V. G., Pershin, S. M., Streltsov, V. N., Tcherniega, N. V.
Format: Article
Language:English
Subjects:
Acoustic properties
Acoustics
Frequency shift
Nanoparticles
Optical Spectroscopy of Inhomogeneous Media
Physics
Physics and Astronomy
Ponderomotive forces
Quantum Optics
Raman spectra
Tobacco
Viruses
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Summary:A theory of generation of anti-Stokes radiation on the eigenvibrations in a suspension of cylindrical nanoparticles in the field of two copropagating electromagnetic pump waves has been developed. Surface ponderomotive forces are shown to induce acoustic vibrations and dipolemoments of nanoparticles at the anti-Stokes frequency. Under these conditions, the scattering efficiency depends on the dielectric characteristics of the solution and the acoustic parameters of the liquid and solid fractions of the suspension. Experiments on stimulated low-frequency Raman scattering of laser radiation in aqueous suspensions of tobacco mosaic virus in a buffer solution have been performed. A coherent signal of the Stokes component with a frequency shift of ≈60GHz is detected; this value is in good agreement with the estimated frequency shift for stimulated excitation of eigenvibrations of cylindrical nanoparticles in a liquid: ≈50 GHz.
ISSN:1541-308X
1934-807X
DOI:10.3103/S1541308X17040033