Trapping and Ultrafast Rotation of Resonant Nanoparticles using Optical Tweezers
Hosted By: Optical Trapping and Manipulation in Molecular and Cellular Biology Technical Group
12 September 2019, 11:00 - 12:00
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Optical resonances in nanoparticles enhance light-matter interactions can be utilized to amplify optical forces at the nanoscale. In this webinar, Prof. Mikael Kall will discuss recent optical trapping studies of gold and silicon nanoparticles, exhibiting localized plasmon and Mie resonances, respectively, and outline how the resonance effects influence trapping behavior and thermal forces. The presenter will describe how one can use photonic torques to force colloidal nanoparticles to rotate at kHz frequencies in optical tweezers and how the rotary nanomotors are used to probe and influence their local environment. For instance, it is possible to estimate the viscosity of the surrounding liquid, to precisely measure changes in the thickness of molecular layers covering the particles, and to release DNA from the particles through controlled photothermal heating.