Optical tweezers

The optical tweezers Tweez250 from Aresis is a very compact system enabling exceptional stability and accuracy. It incorporates a very stable laser which is directed and controlled by acousto-optic deflectors. This technology can generate 2500 traps. Trap to trap switching rates of up to 100 kHz ensure quasi stationary conditions for each trapped particle.

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An optical waveguide conducts laser light into a flow cell. Single nanoparticles in close proximity to the waveguide are trapped in the evanescent field around the waveguide. Light is scattered from the trapped nanoparticles while the intensity of the light depends on the size and in a smaller portion on the refractive index of the particle. With this method, different kinds of nanoparticles can be characterized in terms of shape, chemical composition and size.

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