Light as a Mechanism to Tailor Diffusion
This event is part of the Biophysics/Condensed Matter Seminar Series.
Optical trapping, driving and shorting of small objects has become a topic of increasing interest in multidisciplinary sciences. In this talk we show how the diffusion of small metallic nanoparticles in a liquid can be tailored by illuminating the system with a stationary electromagnetic field. By changing the phase of the radiation we can decrease or increase the diffusion constant bellow and above the standard Brownian value [1,2].
We also show how a chain made of these metallic nanoparticles can be used as a resonant light sail, attached by one end point to a transparent object and propelling it by the use of electromagnetic radiation . Interestingly, there is a window in the frequency spectrum of the radiation in which a null torque equilibrium configuration, with a minimum geometric cross section, corresponds to a maximum in the driving force.
 S.Albaladejo,M.I.Marques,F.Sheffold,J.J.Saenz Nanoletters 9, 3527 (2009)  S.Albaladejo,M.I.Marques,J.J.Saenz Optics Express 19, 11471 (2011)  S. Albaladejo,J.J.Saenz,M.I.Marques, Nanoletters 11, 4597 (2011)