An efficient method for the creation of tunable optical line traps via control of gradient and scattering forces

PLUTO / PLUTO-2 Spatial Light Modulators
Microscopy
Published on:
Authors: Gregory T. Tietjen, Yupeng Kong, and Raghuveer Parthasarathy
Abstract:

“Interparticle interaction energies and other useful physical characteristics can be extracted from the statistical properties of the motion of particles confined by an optical line trap. In practice, however, the potential energy landscape, U(x), imposed by the line provides an extra, and in general unknown, influence on particle dynamics. We describe a new class of line traps in which both the optical gradient and scattering forces acting on a trapped particle are designed to be linear functions of the line coordinate and in which their magnitude can be counterbalanced to yield a flat U(x). These traps are formed using approximate solutions to general relations concerning non-conservative optical forces that have been the subject of recent investigations [Y. Roichman, B. Sun, Y. Roichman, J. Amato-Grill, and D. G. Grier, Phys. Rev. Lett. 100, 013602-4 (2008).]. We implement the lines using holographic optical trapping and measure the forces acting on silica microspheres, demonstrating the tunability of the confining potential energy landscape. Furthermore, we show that our approach efficiently directs available laser power to the trap, in contrast to other methods.”

Open Access

Publication: Optics Express
Issue/Year: Optics Express, Vol. 16, Issue 14, pp. 10341-10348 (2008)
DOI: 10.1364/OE.16.010341
Link: https://doi.org/10.1364/OE.16.010341

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