Session R1: Poster Session III: 1:00 pm - 4:00 pm

1:00 PM–1:00 PM, Wednesday, March 12, 2008
Morial Convention Center Room: Exhibit Hall A

Sponsoring Unit: APS

Abstract ID: BAPS.2008.MAR.R1.269

Abstract: R1.00269 : Optical Trapping Forces from Electric Fields Inside Dielectric Materials

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  Douglas Bonessi
    (Wake Forest University)

  Keith Bonin
    (Wake Forest University)

  Thad Walker
    (University of Wisconsin, Madison)

We developed a method for computing forces from internal electric fields. The internal fields are found using discrete dipole approximation (DDA) and finite difference time domain (FDTD) approaches and the results are compared. We are interested in the results from an optical trapping viewpoint, though other simulations are used for benchmarks. This method can handle arbitrary input beams and particle sizes and shapes. We hope to report on similar calculations to calculate optical torques on birefringent particles in the Mie size regime.

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