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Colloquium: November 11, 2015

Onofrio Maragò*
Optical trapping of nanostructures
Day Time Place
November 11, 2015 Wednesday 15:40 EE 01

Host: Giovanni Volpe

ABSTRACT — Optical trapping [1,2] (OT) of nanostructures has acquired tremendous momentum in the last few years. Manipulating nanoparticles with standard OT is generally difficult because radiation forces scale approximately with particle volume and thermal fluctuations easily overwhelm trapping forces at the nanoscale. However carbon nanostructures, plasmonic nanoparticles, polymer nanofibers, and semiconductor nanowires, have been stably trapped thanks either to their intrinsic resonant behavior or to their highly anisotropic geometry. Here we first introduce optical forces and optical tweezers with a pedagogical approach, then we describe our results on OT of nanostructures with a focus on the role of shape in optical trapping, spectroscopy (Raman and SERS) with implications in force and spectroscopic sensing at the nanoscale. Finally, we will discuss how material hybridization can promote the engineering of mechanical effects of light at the nanoscale.

References: [1] P. H. Jones, O. M. Maragò, G. Volpe, Optical tweezers. Cambridge University Press (2015) [2] O. M. Maragò, P. J. Jones P. G. Gucciardi, G. Volpe, A. C. Ferrari, Optical trapping and manipulation of nanostructures. Nature Nanotech., 8, 807 (2013)

*CNR-IPCF, Istituto per i Processi Chimico-Fisici, Messina, Italy

The Physics Colloquia are designed to address a non-specialist, broad audience and introduce topics of contemporary research through lectures by leading experts. We warmly invite all members of the student body, including undergraduates enrolled in any programme.

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