Optical sorting and detection of sub-micron objects in a motional standing wave

Details Optical sorting and detection of sub-micron objects in a motional standing wave Optical sorting and detection of sub-micron objects in a motional standing wave

2005-09-07

arxiv.org/abs/physics/0509054v1

Physics

Optics

5 pages, 6 figures, Optical Trapping paper

Scientific paper

An extended interference pattern close to surface may result in both a transmissive or evanescent surface fields 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 bi-directional manner and importantly demonstrate experimentally particle sorting in the sub-micron region. This is performed without the need of fluid flow (static sorting). Theoretical calculations experimentally confirm that certain sizes of colloidal particles thermally hop more easily between neighboring traps. A new 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

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