Guiding and trapping microparticles in an extended surface field

Veneranda Garces-Chavez; Gabriel C. Spalding; Kishan Dholakia

doi:10.1117/12.559428

18 October 2004 Guiding and trapping microparticles in an extended surface field

Veneranda Garces-Chavez, Gabriel C. Spalding, Kishan Dholakia

Proceedings Volume 5514, Optical Trapping and Optical Micromanipulation; (2004) https://doi.org/10.1117/12.559428
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

We made use of near-field photonic forces in order to manipulate and trap microparticles in an extended area above a solid surface. Structures in evanescent field were created either by imaging a Ronchi ruler (fringe structure) or by focusing five beams (spot structure) at the top of a prism. The surface field couples to microparticles in close proximity, where the near-field wave can be converted to a propagating wave, via photon tunnelling across the gap from prism to microparticles. Due to transverse optical gradients and radiation pressure, microparticles immersed in water were laterally trapped and longitudinally guided along the direction of the evanescent waves. By splitting the laser beam into two equal counterpropagating beams, another evanescent wave was created exactly with the same structure in the opposite direction to the first one. We use this geometry we demonstrate stably trap of thousand of microparticles over an area of about a millimetre squared. Red blood and yeast cells were also individually trapped in an array of potential wells. We believe this is the first demonstration of guiding and, separately, trapped in unison multiple microparticles on a surface.

Citation Download Citation

Veneranda Garces-Chavez, Gabriel C. Spalding, and Kishan Dholakia "Guiding and trapping microparticles in an extended surface field", Proc. SPIE 5514, Optical Trapping and Optical Micromanipulation, (18 October 2004); https://doi.org/10.1117/12.559428

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