Publication detail
Simplified description of optical forces acting on a nanoparticle in the Gaussian standing wave
Zemanek P, Jonas A, Liska M
English title
Simplified description of optical forces acting on a nanoparticle in the Gaussian standing wave
Type
Peer-reviewed article not indexed in WoS or Scopus
Language
en
Original abstract
We study the axial force acting on dielectric spherical particles smaller than the trapping wavelength that are placed in the Gaussian standing wave. We derive analytical formulas for immersed particles with relative refractive indices close to unity and compare them with the numerical results obtained by generalized Lorenz-Mie theory (GLMT). We show that the axial optical force depends periodically on the particle size and that the equilibrium position of the particle alternates between the standing-wave antinodes and nodes. For certain particle sizes, gradient forces from the neighboring antinodes cancel each other and disable particle confinement. Using the GLMT we compare maximum axial trapping forces provided by the Gaussian standing wave trap (SWT) and single-beam trap (SBT) as a function of particle size, refractive index, and beam waist size. We show that the SWT produces axial forces at least ten times stronger and permits particle confinement in a wider range of refractive indices and beam waists compared with those of the SBT. (C) 2002 Optical Society of America.
Keywords in English
FOCUSED LASER-BEAM, RAYLEIGH PARTICLES, TWEEZERS, TRAP, MANIPULATION, MICROSCOPE, FIELDS
Released
2002-05-01
ISSN
1084-7529
Journal
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
Volume
19
Number
5
Pages from–to
1025–
Pages count
10
BIBTEX
@article{BUT40735,
author="Miroslav {Liška}",
title="Simplified description of optical forces acting on a nanoparticle in the Gaussian standing wave",
journal="JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION",
year="2002",
volume="19",
number="5",
pages="10",
issn="1084-7529"
}