Manipulation of microparticles with integrated optics

Olav Gaute Helles; Katarina Grujic; J. Patrick Hole; Hitesh Jaising; James S. Wilkinson

doi:10.1117/12.647325

24 February 2006 Manipulation of microparticles with integrated optics

Olav Gaute Helles, Katarina Grujic, J. Patrick Hole, Hitesh Jaising, James S. Wilkinson

Proceedings Volume 6123, Integrated Optics: Devices, Materials, and Technologies X; 61230M (2006) https://doi.org/10.1117/12.647325
Event: Integrated Optoelectronic Devices 2006, 2006, San Jose, California, United States

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.

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Olav Gaute Helles, Katarina Grujic, J. Patrick Hole, Hitesh Jaising, and James S. Wilkinson "Manipulation of microparticles with integrated optics", Proc. SPIE 6123, Integrated Optics: Devices, Materials, and Technologies X, 61230M (24 February 2006); https://doi.org/10.1117/12.647325

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KEYWORDS

Particles

Waveguides

Integrated optics

Optical tweezers

Refractive index

Yeast

Gold

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