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Manipulation of microparticles with integrated optics

Manipulation of microparticles with integrated optics
Manipulation of microparticles with integrated optics
In a dielectric waveguide, the optical power is confined mostly in the core of the waveguide, where the refractive index is highest. Outside of the core the field is evanescent, i.e., the field strength decreases exponentially with the distance from the core. This evanescent field can be used to manipulate microparticles. For a particle with index of refraction higher than that of the surrounding medium (water), the optical forces due to the evanescent field act to guide the particle along the waveguide. The use of waveguides to trap particles combines the possibilities of conventional optical tweezers with the techniques employed in integrated optics, and it has the added advantage of integration of several functions on a single chip. We have experimentally observed size-dependent trapping and propulsion at velocities up to 33µm/s of polystyrene spheres, of diameters between 3 and 12µm, and in propulsion of 0.25µm diameter gold spheres at velocities up to 500µm/s. A Y-junction with a multimode input waveguide has been used to sort particles. By moving the input fibre relative to the input waveguide, the light goes into one of the two output branches. We have shown that this principle can be used to sort polystyrene microbeads. Recently we have used counter-propagating waves to move particles in both directions and also to stop a particle at a precise location. Experimental results and simulations for polystyrene microbeads, yeast cells and gold particles are presented.
Hellesø, O.G.
79e9b15b-e42c-4a15-8465-d1838152a090
Grujic, K.
31e79dff-33ca-4aa3-90d4-cc08d1fefaed
Hole, J.P.
97666e85-e127-436d-867a-27d1948f83d5
Jaising, H.
36dca3de-dc7e-402e-87ef-2007defb0f7c
Wilkinson, J.S.
73483cf3-d9f2-4688-9b09-1c84257884ca
Hellesø, O.G.
79e9b15b-e42c-4a15-8465-d1838152a090
Grujic, K.
31e79dff-33ca-4aa3-90d4-cc08d1fefaed
Hole, J.P.
97666e85-e127-436d-867a-27d1948f83d5
Jaising, H.
36dca3de-dc7e-402e-87ef-2007defb0f7c
Wilkinson, J.S.
73483cf3-d9f2-4688-9b09-1c84257884ca

Hellesø, O.G., Grujic, K., Hole, J.P., Jaising, H. and Wilkinson, J.S. (2005) Manipulation of microparticles with integrated optics. Conference on Integrated Optics - Devices, Materials, and Technologies IX, United States. 23 - 25 Jan 2005. (doi:10.1117/12.647325).

Record type: Conference or Workshop Item (Paper)

Abstract

In a dielectric waveguide, the optical power is confined mostly in the core of the waveguide, where the refractive index is highest. Outside of the core the field is evanescent, i.e., the field strength decreases exponentially with the distance from the core. This evanescent field can be used to manipulate microparticles. For a particle with index of refraction higher than that of the surrounding medium (water), the optical forces due to the evanescent field act to guide the particle along the waveguide. The use of waveguides to trap particles combines the possibilities of conventional optical tweezers with the techniques employed in integrated optics, and it has the added advantage of integration of several functions on a single chip. We have experimentally observed size-dependent trapping and propulsion at velocities up to 33µm/s of polystyrene spheres, of diameters between 3 and 12µm, and in propulsion of 0.25µm diameter gold spheres at velocities up to 500µm/s. A Y-junction with a multimode input waveguide has been used to sort particles. By moving the input fibre relative to the input waveguide, the light goes into one of the two output branches. We have shown that this principle can be used to sort polystyrene microbeads. Recently we have used counter-propagating waves to move particles in both directions and also to stop a particle at a precise location. Experimental results and simulations for polystyrene microbeads, yeast cells and gold particles are presented.

Full text not available from this repository.

More information

Published date: 2005
Venue - Dates: Conference on Integrated Optics - Devices, Materials, and Technologies IX, United States, 2005-01-23 - 2005-01-25

Identifiers

Local EPrints ID: 76412
URI: https://eprints.soton.ac.uk/id/eprint/76412
PURE UUID: d6d86082-8072-44d8-9b3f-6dd990b4dda3
ORCID for J.S. Wilkinson: ORCID iD orcid.org/0000-0003-4712-1697

Catalogue record

Date deposited: 11 Mar 2010
Last modified: 20 Jul 2019 01:29

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