Size dependence of gradient and nongradient optical forces in silver nanoparticles

Vance Wong, Mark A Ratner

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We examine the size dependence of gradient and nongradient contributions to the optically induced force on single, isolated nanometer-sized silver particles in water under plane-wave illumination. Using a recently developed method based on discrete-dipole approximation (DDA), we find that all contributions scale linearly with volume in this regime. This dependence can be rationalized by using semiempirical considerations based on the Mie-Debye theory. We also comment on a common approach to determining conservative and nonconservative force contributions on a single particle in an externally applied field. Our analysis suggests that the Mie-Debye theory cross sections cannot be used to evaluate conservative and nonconservative contributions to the force. Finally, we comment on aspects of the relationship between DDA and continuum-based treatments of optical force phenomena and find that inclusion of multiple scattering effects are essential to an understanding of the size dependence of the forces on mesoscopic particles.

Original languageEnglish
Pages (from-to)106-112
Number of pages7
JournalJournal of the Optical Society of America B: Optical Physics
Volume24
Issue number1
DOIs
Publication statusPublished - 2007

Fingerprint

silver
gradients
nanoparticles
nonconservative forces
dipoles
approximation
plane waves
illumination
inclusions
continuums
cross sections
scattering
water

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Size dependence of gradient and nongradient optical forces in silver nanoparticles. / Wong, Vance; Ratner, Mark A.

In: Journal of the Optical Society of America B: Optical Physics, Vol. 24, No. 1, 2007, p. 106-112.

Research output: Contribution to journalArticle

@article{44e4c2b68866495293d4b6de43b1170f,
title = "Size dependence of gradient and nongradient optical forces in silver nanoparticles",
abstract = "We examine the size dependence of gradient and nongradient contributions to the optically induced force on single, isolated nanometer-sized silver particles in water under plane-wave illumination. Using a recently developed method based on discrete-dipole approximation (DDA), we find that all contributions scale linearly with volume in this regime. This dependence can be rationalized by using semiempirical considerations based on the Mie-Debye theory. We also comment on a common approach to determining conservative and nonconservative force contributions on a single particle in an externally applied field. Our analysis suggests that the Mie-Debye theory cross sections cannot be used to evaluate conservative and nonconservative contributions to the force. Finally, we comment on aspects of the relationship between DDA and continuum-based treatments of optical force phenomena and find that inclusion of multiple scattering effects are essential to an understanding of the size dependence of the forces on mesoscopic particles.",
author = "Vance Wong and Ratner, {Mark A}",
year = "2007",
doi = "10.1364/JOSAB.24.000106",
language = "English",
volume = "24",
pages = "106--112",
journal = "Journal of the Optical Society of America B: Optical Physics",
issn = "0740-3224",
publisher = "The Optical Society",
number = "1",

}

TY - JOUR

T1 - Size dependence of gradient and nongradient optical forces in silver nanoparticles

AU - Wong, Vance

AU - Ratner, Mark A

PY - 2007

Y1 - 2007

N2 - We examine the size dependence of gradient and nongradient contributions to the optically induced force on single, isolated nanometer-sized silver particles in water under plane-wave illumination. Using a recently developed method based on discrete-dipole approximation (DDA), we find that all contributions scale linearly with volume in this regime. This dependence can be rationalized by using semiempirical considerations based on the Mie-Debye theory. We also comment on a common approach to determining conservative and nonconservative force contributions on a single particle in an externally applied field. Our analysis suggests that the Mie-Debye theory cross sections cannot be used to evaluate conservative and nonconservative contributions to the force. Finally, we comment on aspects of the relationship between DDA and continuum-based treatments of optical force phenomena and find that inclusion of multiple scattering effects are essential to an understanding of the size dependence of the forces on mesoscopic particles.

AB - We examine the size dependence of gradient and nongradient contributions to the optically induced force on single, isolated nanometer-sized silver particles in water under plane-wave illumination. Using a recently developed method based on discrete-dipole approximation (DDA), we find that all contributions scale linearly with volume in this regime. This dependence can be rationalized by using semiempirical considerations based on the Mie-Debye theory. We also comment on a common approach to determining conservative and nonconservative force contributions on a single particle in an externally applied field. Our analysis suggests that the Mie-Debye theory cross sections cannot be used to evaluate conservative and nonconservative contributions to the force. Finally, we comment on aspects of the relationship between DDA and continuum-based treatments of optical force phenomena and find that inclusion of multiple scattering effects are essential to an understanding of the size dependence of the forces on mesoscopic particles.

UR - http://www.scopus.com/inward/record.url?scp=33846941236&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33846941236&partnerID=8YFLogxK

U2 - 10.1364/JOSAB.24.000106

DO - 10.1364/JOSAB.24.000106

M3 - Article

VL - 24

SP - 106

EP - 112

JO - Journal of the Optical Society of America B: Optical Physics

JF - Journal of the Optical Society of America B: Optical Physics

SN - 0740-3224

IS - 1

ER -