Berlin 2015 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 54: Microswimmers, Active Liquids III (joint DY/BP/CPP)
BP 54.2: Vortrag
Freitag, 20. März 2015, 10:00–10:15, C 264
Optothermal Manipulation of Plasmonic Nanoparticles in Viscous Solvents — •Felix Winterer1,2, Christoph Maier1,2, Theobald Lohmüller1,2, and Jochen Feldmann1,2 — 1Photonics and Optoelectronics Group, Ludwig-Maximilians-Universität München, Munich, Germany — 2Nanosystems Initiative Munich (NIM), Munich, Germany
We present an all-optical approach to move and manipulate single plasmonic nanoparticles with high accuracy in viscous solvents.
Gold nanoparticles are subject to optical forces and heat generation upon irradiation with a focussed laser beam. Tuning the laser wavelength with respect to the plasmon resonance frequency allows for switching between repulsive and attractive optical forces, which renders it possible to trap or push individual nanoparticles in two and three dimensions. At the same time, laser light can induce heat in the surrounding medium.
We explore how both effects can be employed to control nanoparticle movement by a combination of thermal gradients and optical forces and discuss further applications of this approach for nanolithography and nanoscale physics.