Modeling of optical traps for aerosols

TY - JOUR

T1 - Modeling of optical traps for aerosols

A1 - Burnham,Daniel R.

A1 - McGloin,David

AU - Burnham,Daniel R.

AU - McGloin,David

PY - 2011/12

Y1 - 2011/12

N2 - <p>Experimental observations suggest that there are differences between the behavior of particles optically trapped in air and trapped in a liquid phase. We have modified the Mie-Debye spherical aberration theory to numerically simulate an aerosol optical trap in an attempt to explain and predict the differences. The model incorporates Mie scattering and a trapping beam focused through media of stratified refractive index. We show that geometrical optics cannot correctly describe the aerosol optical trap and that spherical aberration must be included. We qualitatively explain the observed phenomena before discussing the limits of the experimental techniques and methods to improve it. We conclude that the system does not behave as a true "optical tweezers," varying between levitation and single beam gradient force trapping, depending on particle and beam parameters. (C) 2011 Optical Society of America</p>

AB - <p>Experimental observations suggest that there are differences between the behavior of particles optically trapped in air and trapped in a liquid phase. We have modified the Mie-Debye spherical aberration theory to numerically simulate an aerosol optical trap in an attempt to explain and predict the differences. The model incorporates Mie scattering and a trapping beam focused through media of stratified refractive index. We show that geometrical optics cannot correctly describe the aerosol optical trap and that spherical aberration must be included. We qualitatively explain the observed phenomena before discussing the limits of the experimental techniques and methods to improve it. We conclude that the system does not behave as a true "optical tweezers," varying between levitation and single beam gradient force trapping, depending on particle and beam parameters. (C) 2011 Optical Society of America</p>

KW - ELECTROMAGNETIC DIFFRACTION

KW - MIE RESONANCES

KW - TWEEZERS

KW - FORCE

KW - BEAM

KW - PARTICLES

KW - MANIPULATION

KW - DROPLETS

KW - REGIME

KW - FIELD

UR - http://arxiv.org/pdf/1006.4707v1.pdf

U2 - 10.1364/JOSAB.28.002856

DO - 10.1364/JOSAB.28.002856

M1 - Article

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 - 12

VL - 28

SP - 2856

EP - 2864

ER -