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Proceedings Paper

Parametric study of axial trapping forces on an elliptically symmetric dielectric in the ray optics regime
Author(s): Kristine Faith J. Roque; Giovanni A. Tapang; Caesar A. Saloma
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Paper Abstract

We present the parametric investigation of the axial trapping forces generated by the interaction of an ellipsoidal dielectric and a focused, randomly polarized Gaussian beam in the geometrical optics regime. We show that particle elongation along the optical axis results to a more unstable axial trap compared to that of a reference sphere due to the more positive axial forces for positive axial displacements. Decreasing the refractive index difference between the particle and the surrounding medium (Δn = 0.09) decreases the magnitude of the axial force for positive particle displacements; and for a narrow range of axial displacements an axial trap can be achieved. Increasing the beam wavelength increases the magnitude of the axial force and for 1060 nm an axial trap can be achieved.

Paper Details

Date Published: 29 July 2015
PDF: 6 pages
Proc. SPIE 9659, International Conference on Photonics Solutions 2015, 96591M (29 July 2015); doi: 10.1117/12.2196267
Show Author Affiliations
Kristine Faith J. Roque, Univ. of the Philippines (Philippines)
Giovanni A. Tapang, Univ. of the Philippines (Philippines)
Caesar A. Saloma, Univ. of the Philippines (Philippines)

Published in SPIE Proceedings Vol. 9659:
International Conference on Photonics Solutions 2015
Surasak Chiangga; Sarun Sumriddetchkajorn, Editor(s)

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