Colloidal traffic in static and dynamic optical lattices

Ryan L. Smith*, G. C. Spalding, S. L. Neale, K. Dholakia, Michael Peter MacDonald

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

Here, we present real-space studies of Brownian hard sphere transport though externally defined potential energy landscapes. Specifically, we examine how colloidal particles are re-routed as moderately dense suspensions pass through optical lattices, concentrating our attention upon the degree of sorting that occurs in multi-species flows. While methodologies reported elsewhere for microfluidic sorting of colloidal or biological matter employ active intervention to identify and selectively re-route particles one-by-one, the sorting described here is passive, with intrinsically parallel processing. In fact, the densities of co-flowing species examined here are sufficient to allow for significant many-body effects, which generally reduce the efficiencies of re-routing and sorting. We have studied four classes of transport phenomena, involving colloidal traffic within, respectively, a static lattice with a DC fluid flow, a continuously translating lattice with a DC fluid flow, a flashing lattice with AC fluid flow, and a flashing lattice with combined AC and DC fluid flow. We find that continuous lattice translation helps to reduce nearest neighbor particle distances, providing promise for efficiency improvements in future high throughput applications.

Original languageEnglish
Title of host publicationOptical Trapping and Optical Micromanipulation III
EditorsK Dholakia, GC Spalding
PublisherSPIE
PagesU667-U678
Number of pages12
ISBN (Print)0-8194-6405-8
DOIs
Publication statusPublished - 2006
EventConference on Optical Trapping and Optical Micromanipulation III - San Diego, Canada
Duration: 13 Aug 200617 Aug 2006

Publication series

NamePROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE)
PublisherSPIE-INT SOC OPTICAL ENGINEERING
Volume6326
ISSN (Print)0277-786X

Conference

ConferenceConference on Optical Trapping and Optical Micromanipulation III
Country/TerritoryCanada
Period13/08/0617/08/06

Keywords

  • optical tweezers
  • cell sorting
  • transport
  • optical lattice
  • angular Doppler effect
  • ratchet
  • DEFORMABILITY

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