OMITEC: Experiments with evanescent standing wave - evanescent optical conveyor belt

Experiments with evanescent standing wave - evanescent optical conveyor belt

Experimental set-up 

We used laser Verdi V5 (Laser 1) for generation of two counter-propagating evanescent waves on the top of the prism. Movable mirror ensures phase changes in one of the beams so that the interference fringes can be moved along the surface. Laser 2 serves as an single beam optical trap. Fast CCD camera records the object behaviour.


Direct experimental proof of the particle size effect and evanescent optical conveyor belt

We wanted to prove that the theoretical results based on our simplified model provide correct predictions. Therefore, we created a sample made of mixture of polystyrene beads of two sizes so that one size is insensitive to the standing wave and the other size is sensitive. Therefore, if the fringes move along the surface (due to motion of movable mirror), the sensitive size follows the fringes while the insensitive almost does not change its position.


MOVIE 520 x 410 nm                       MOVIE 350 x 750 nm

More can be found in the following papers:

T. Cizmar, M. Siler, M. Sery, P. Zemanek, V. Garces-Chavez, K. Dholakia: "Optical sorting and detection of submicrometer objects in a motional standing wave",
       Phys. Rev. B 74, 035105:1-6, 2006,   ABSTRACT   DOWNLOAD

M. Siler, T. Cizmar, M. Sery, P. Zemanek: "Optical forces generated by evanescent standing waves and their usage for sub-micron particle delivery",
       Appl. Phys. B 84, 157-165, 2006,   ABSTRACT   DOWNLOAD

M. Sery, M. Siler, T. Cizmar, P. Jakl, P. Zemanek: "Sub-micron particle delivery using evanescent field",
       Proceedings of SPIE 5958, 0L1-0L5, 2005,   ABSTRACT

M. Siler, M. Sery, T. Cizmar, and P. Zemanek: "Submicron particle localization using evanescent field",
       Proceedings of SPIE 5930, 0R1-0R9, 2005,   ABSTRACT   DOWNLOAD

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Last modification: 30 Mar 2007