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

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

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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Tomas Cizmar, Martin Siler, Mojmir Sery, Pavel Zemanek, Veneranda Garces-Chavez, Kishan Dholakia. 2005-09-07. Optical sorting and detection of sub-micron objects in a motional standing wave. https://doi.org/10.1103/physrevb.74.035105

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