Nanotrapping and the thermodynamics of optical tweezers

Details Nanotrapping and the thermodynamics of optical tweezers Nanotrapping and the thermodynamics of optical tweezers

2007-02-06

arxiv.org/abs/physics/0702047v1

in R. Sang and J. Dobson (eds), Australian Institute of Physics (AIP) 17th National Congress 2006: Refereed Papers, (Australia

Physics

Optics

5 pages, 3 figures, presented at 17th AIP Congress, Brisbane, 2006

Scientific paper

Particles that can be trapped in optical tweezers range from tens of microns down to tens of nanometres in size. Interestingly, this size range includes large macromolecules. We show experimentally, in agreement with theoretical expectations, that optical tweezers can be used to manipulate single molecules of polyethylene oxide suspended in water. The trapped molecules accumulate without aggregating, so this provides optical control of the concentration of macromolecules in solution. Apart from possible applications such as the micromanipulation of nanoparticles, nanoassembly, microchemistry, and the study of biological macromolecules, our results also provide insight into the thermodynamics of optical tweezers.

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