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Rib waveguides for trapping and transport of particles

Permanent link
https://hdl.handle.net/10037/9842
DOI
https://doi.org/10.1364/OE.24.004477
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accepted manuscript version (PDF)
Date
2016-02-23
Type
Journal article
Tidsskriftartikkel
Peer reviewed

Author
Ahluwalia, Balpreet Singh; Helle, Øystein Ivar; Hellesø, Olav Gaute
Abstract
Rib waveguides are investigated as an alternative to strip waveguides for planar trapping and transport of microparticles. Microparticles are successfully propelled along the surface of rib waveguides and trapped in the gap between opposing rib waveguides. The trapping capabilities of waveguide end facets formed by a single and opposing waveguide geometries are investigated. The slab beneath a rib waveguide continues to guide light after the end facet of a rib waveguide. Thus particles can be trapped in wider gaps formed by opposing rib waveguides than with strip waveguides. Rib waveguides were found more efficient in trapping a collection of particles in the gap and particles could be moved to different locations in the gap by changing the relative power in the two opposing rib waveguides. Numerical simulations are used to show that the trapping efficiency on the surface of rib and strip waveguides is comparable. The simulations also confirm the advantage of opposing rib waveguides for trapping particles in wide gaps. The low sidewalls of rib waveguides give low propagation losses and make it easy to integrate rib waveguides with other functions in a lab-on-a-chip where particle trapping and transport is required.
Description
This is the accepted manuscript version. Published version can be found at http://doi.org/10.1364/OE.24.004477.
Publisher
Optical Society of America
Citation
Optics Express 2016, 24(5):4477-4487
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