Lateral optical binding between two colloidal particles

Ming Tzo Wei, Tsz Fai Jack NG, C. T. Chan, H. Daniel Ou-Yang*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

16 Citations (Scopus)


An optical binding force between two nearby colloidal particles trapped by two coherent laser beams is measured by phase-sensitive detection. The binding force is long-range and spatially oscillatory. For identical linearly-polarized incident beams, the oscillation period is equal to the optical wavelength. For mutually perpendicular polarizations, a new force appears with half-wavelength periodicity, caused by double inter-particle scattering. This force is observable only with cross-polarized incident beams, for which the stronger single-scattering forces are forbidden by parity.

Original languageEnglish
Article number38883
JournalScientific Reports
Publication statusPublished - 16 Dec 2016

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