Thermal tweezers for surface manipulation with nano-scale resolution
Gramotnev, Dmitri K., Mason, Daniel R., Gramotnev, Galina, & Rasmussen, Anthony J. (2007) Thermal tweezers for surface manipulation with nano-scale resolution. Applied Physics Letters, 90, 054108.
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Abstract
In this letter, we demonstrate that random Brownian forces can be used for effective trapping and manipulation of nanoparticles and molecules on surfaces in the presence of strong temperature modulation. Substantial (~ 2 orders of magnitude) increase in the modulation of particle concentration (trapping efficiency) compared to thermophoresis in a bulk medium is predicted and explained by a periodic potential of interaction between a particle/molecule and the crystalline surface. As a result, a new nanofabrication and manipulation technique for creating optically-induced complex surface structures with nano-scale resolution below tens of nanometers is proposed and developed.
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