Extended-area optically induced organization of microparticles on a surface

V. Garćs-Chávez, K. Dholakia, G. C. Spalding

Research output: Contribution to journalArticlepeer-review

114 Citations (Scopus)


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.

Original languageEnglish
Article number031106
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Issue number3
Publication statusPublished - 2005 Jan 17

Bibliographical note

Funding Information:
This work was supported by the European Science Foundation, the Leverhulme Trust and the U.K. Engineering and Physical Sciences Research Council. G.C.S. is also supported by an award from the Research Corporation and by the National Science Foundation through Grant No. DMR-0216631.

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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