Extended-area optically induced organization of microparticles on a surface

Garcés-Chávez, V.; Dholakia, K.; Spalding, G. C.
January 2005
Applied Physics Letters;1/17/2005, Vol. 86 Issue 3, p031106
Academic Journal
To extend beyond the limited field of view associated with optical tweezers, we implement a new geometry for lensless optical trapping (“LOT”). A Ronchi ruling is imaged at a sample interface beyond the critical angle for total internal reflection imposing local structure upon the optical fields. Due to the resulting transverse optical gradients, more than one thousand microparticles spanning 1 mm2 were organized into microchannels that are entirely optical in origin. A generalized approach is presented, allowing for either guiding or stable trapping, as a function of the relative intensity of the counterpropagating surface waves.


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