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

Tomáš Čižmár, Martin Šiler, Mojmír Šerý, Pavel Zemánek, Veneranda Garcés-Chávez, Kishan Dholakia

Research output: Contribution to journalArticlepeer-review

145 Citations (Scopus)


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
Article number035105
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number3
Publication statusPublished - 2006

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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