Optical sorting and detection of submicrometer objects in a motional standing wave

Tomas Cizmar, Martin Siler, Mojmir Sery, Pavel Zemanek, Veneranda Garces-Chavez, Kishan Dholakia

Research output: Contribution to journalArticlepeer-review

133 Citations (Scopus)

Abstract

An extended interference pattern close to the surface may result in either a transmissive or an evanescent surface field for large-area manipulation of trapped particles. The affinity of differing particle sizes to a moving standing-wave light pattern allows us to hold and deliver them in a bidirectional manner and demonstrate experimentally particle sorting in the submicrometer region. This is performed without the need of fluid flow (static sorting). Theoretical predictions support the experimental observations that certain sizes of colloidal particles thermally hop more easily between neighboring traps. A generic method is also presented for particle position detection in an extended periodic light pattern and applied to characterization of optical traps and particle behavior.

Original languageEnglish
Pages (from-to)035105
Number of pages6
JournalPhysical Review. B, Condensed matter and materials physics
Volume74
Issue number3
DOIs
Publication statusPublished - Jul 2006

Keywords

  • EVANESCENT FIELD
  • RADIATION FORCES
  • NEAR-FIELD
  • PARTICLES
  • SPHERE
  • GUIDE
  • BEAM

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