Counter-propagating patterns in the BioPhotonics Workstation: getting more out of light for trapping and manipulation

Darwin Palima, T. Lindballe, M.V. Kristensen, Sandeep Tauro, Andrew Rafael Bañas, H. Stapelfeldt, Søren Rud Keiding, Jesper Glückstad

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


The counter-propagating geometry opens an extra degree of freedom for shaping light while subsuming single-sided illumination as a special case (i.e., one beam set turned off). In its conventional operation, our BioPhotonics Workstation (BWS) uses symmetric, co-axial counter-propagating beams for stable three-dimensional manipulation of multiple particles. In this work, we analyze counter-propagating shaped-beam traps that depart from this conventional geometry. We show that projecting shaped beams with separation distances previously considered axially unstable can, in fact, enhance the trap by improving axial and transverse trapping stiffness. We also show interesting results of trapping and micromanipulation experiments that combine optical forces with fluidic forces. These results hint about the rich potential of using patterned counter-propagating beams for optical trapping and manipulation, which still remains to be fully tapped.
Original languageEnglish
Title of host publicationOptical Trapping and Optical Micromanipulation VII
PublisherSPIE - International Society for Optical Engineering
Publication date27. Aug 2010
Article number77620U
Publication statusPublished - 27. Aug 2010
Externally publishedYes
EventSPIE Optics+Photonics (Nanoscience+Engineering) - San Diego, California, United States
Duration: 1. Aug 20105. Aug 2010


ConferenceSPIE Optics+Photonics (Nanoscience+Engineering)
CountryUnited States
CitySan Diego, California
SeriesProceedings of SPIE, the International Society for Optical Engineering

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