Articolo in rivista, 2012, ENG

Optical trapping of nanotubes with cylindrical vector beams

Donato, M. G.; Vasi, S.; Sayed, R.; Jones, P. H.; Bonaccorso, F.; Ferrari, A. C.; Gucciardi, P. G.; Marago, O. M.

IPCF CNR

We use laser beams with radial and azimuthal polarization to optically trap carbon nanotubes. We measure force constants and trap parameters as a function of power showing improved axial trapping efficiency with respect to linearly polarized beams. The analysis of the thermal fluctuations highlights a significant change in the optical trapping potential when using cylindrical vector beams. This enables the use of polarization states to shape optical traps according to the particle geometry, as well as paving the way to nanoprobe-based photonic force microscopy with increased performance compared to a standard linearly polarized configuration. (C) 2012 Optical Society of America

Optics letters 37 (16), pp. 3381–3383

Keywords

optical trapping

CNR authors

Gucciardi Pietro Giuseppe, Marago Onofrio

CNR institutes

IPCF – Istituto per i processi chimico-fisici