Spontaneous density grating formation in suspensions of dielectric nanoparticles

Mark Wiggins, Gordon Robb, Brian McNeil, David Jones, Steven Jamison, Dino Jaroszynski

Research output: Contribution to journalArticle

8 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)997-1006
Number of pages10
JournalJournal of Modern Optics
Volume49
Issue number5-6
DOIs
Publication statusPublished - 15 Apr 2002

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gratings
nanoparticles
radiation distribution
pumps
coherent radiation
bunching
Rayleigh scattering
latex
wavelengths
backscattering
interference
modulation
radii
radiation
scattering
water
lasers

Keywords

  • dielectric nanoparticles
  • nonlinear optical behaviour
  • spontaneous density grating formation
  • Collective Rayleigh Scattering

Cite this

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title = "Spontaneous density grating formation in suspensions of dielectric nanoparticles",
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.",
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Spontaneous density grating formation in suspensions of dielectric nanoparticles. / Wiggins, Mark; Robb, Gordon; McNeil, Brian; Jones, David; Jamison, Steven; Jaroszynski, Dino.

In: Journal of Modern Optics, Vol. 49, No. 5-6, 15.04.2002, p. 997-1006.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Spontaneous density grating formation in suspensions of dielectric nanoparticles

AU - Wiggins, Mark

AU - Robb, Gordon

AU - McNeil, Brian

AU - Jones, David

AU - Jamison, Steven

AU - Jaroszynski, Dino

PY - 2002/4/15

Y1 - 2002/4/15

N2 - 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.

AB - 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.

KW - dielectric nanoparticles

KW - nonlinear optical behaviour

KW - spontaneous density grating formation

KW - Collective Rayleigh Scattering

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JO - Journal of Modern Optics

JF - Journal of Modern Optics

SN - 0950-0340

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