Computational study of the optical trapping of ellipsoidal particles

SH Simpson, S Hanna

Research output: Contribution to journalArticle (Academic Journal)

43 Citations (Scopus)

Abstract

Ellipsoidal dielectric particles may be trapped in a linearly polarized Gaussian beam such that they are harmonically bound with respect to each of their rotational and translational degrees of freedom. The ellipsoid belongs to the highest symmetry class for which this is possible. Typically, the longest axis of the ellipsoid aligns itself with the incident beam axis and the second longest with the polarization direction. We investigate this special property by evaluating the trap stiffness matrix for dielectric ellipsoids with aspect ratios (largest:smallest dimension) in the range 1–10, using the discrete dipole approximation. The results are interpreted using a simple phenomenological model and conclusions are drawn concerning optimization of the trap stiffness for specific applications.
Translated title of the contributionComputational study of the optical trapping of ellipsoidal particles
Original languageEnglish
Pages (from-to)053808
Number of pages11
JournalPhysical Review A: Atomic, Molecular and Optical Physics
Volume84
DOIs
Publication statusPublished - Nov 2011

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