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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 6, Iss. 9 — Oct. 3, 2011

Application of the discrete dipole approximation to optical trapping calculations of inhomogeneous and anisotropic particles

Stephen H. Simpson and Simon Hanna  »View Author Affiliations


Optics Express, Vol. 19, Issue 17, pp. 16526-16541 (2011)
http://dx.doi.org/10.1364/OE.19.016526


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Abstract

The accuracy of the discrete dipole approximation (DDA) for computing forces and torques in optical trapping experiments is discussed in the context of dielectric spheres and a range of low symmetry particles, including particles with geometric anisotropy (spheroids), optical anisotropy (birefringent spheres) and structural inhomogeneity (core-shell spheres). DDA calculations are compared with the results of exact T-matrix theory. In each case excellent agreement is found between the two methods for predictions of optical forces, torques, trap stiffnesses and trapping positions. Since the DDA lends itself to calculations on particles of arbitrary shape, the study is augmented by considering more general systems which have received recent experimental interest. In particular, optical forces and torques on low symmetry letter-shaped colloidal particles, birefringent quartz cylinders and biphasic Janus particles are computed and the trapping behaviour of the particles is discussed. Very good agreement is found with the available experimental data. The efficiency of the DDA algorithm and methods of accelerating the calculations are also discussed.

© 2011 OSA

OCIS Codes
(140.7010) Lasers and laser optics : Laser trapping
(170.4520) Medical optics and biotechnology : Optical confinement and manipulation
(050.1755) Diffraction and gratings : Computational electromagnetic methods
(290.5825) Scattering : Scattering theory

ToC Category:
Optical Trapping and Manipulation

History
Original Manuscript: June 13, 2011
Revised Manuscript: July 13, 2011
Manuscript Accepted: July 13, 2011
Published: August 12, 2011

Virtual Issues
Vol. 6, Iss. 9 Virtual Journal for Biomedical Optics

Citation
Stephen H. Simpson and Simon Hanna, "Application of the discrete dipole approximation to optical trapping calculations of inhomogeneous and anisotropic particles," Opt. Express 19, 16526-16541 (2011)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=oe-19-17-16526


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