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Spontaneous density grating formation in suspensions of dielectric nanoparticles

Wiggins, Mark and Robb, Gordon and McNeil, Brian and Jones, David and Jamison, Steven and Jaroszynski, Dino (2002) Spontaneous density grating formation in suspensions of dielectric nanoparticles. Journal of Modern Optics, 49 (5-6). pp. 997-1006. ISSN 0950–0340

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Abstract

Experimental evidence for nonlinear optical behaviour due to the spontaneous formation of wavelength-scale density modulations or gratings in suspensions of dielectric particles is presented. A collection of dielectric particles pumped by a coherent radiation field may simultaneously form a density grating on the scale of the radiation wavelength and a coherently backscattered radiation field. The particle density grating is generated as a result of a periodic ponderomotive potential formed by the interference of the pump and backscattered fields. The experiment used a water suspension of latex microspheres (radius ≈ 56nm) pumped by a green CW laser (532nm, power ≤ 5W). A theoretical model of collective scattering of light from dielectric particles has been extended to include the effects of viscous and Brownian forces on the particles. This model predicts a small degree of particle bunching from which coherent backscattering of the pump occurs. The results of the theoretical model compare favourably with the experimental evidence. The relation between the results presented here and the phenomenon of Collective Rayleigh Scattering (CRS) is discussed.

Item type: Article
ID code: 18274
Keywords: dielectric nanoparticles, nonlinear optical behaviour, spontaneous density grating formation, Collective Rayleigh Scattering, Pharmacy and materia medica, Solid state physics. Nanoscience, Physics, Atomic and Molecular Physics, and Optics
Subjects: Medicine > Pharmacy and materia medica
Science > Physics > Solid state physics. Nanoscience
Science > Physics
Department: Faculty of Science > Physics
Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 31 Mar 2010 19:51
    Last modified: 05 Sep 2014 01:17
    URI: http://strathprints.strath.ac.uk/id/eprint/18274

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