Photonic Torque Microscopy of the Nonconservative Force Field for Optically Trapped Silicon Nanowires

0464559 - ÚPT 2017 RIV US eng J - Journal Article
Irrera, A. - Maggazu, A. - Artoni, P. - Simpson, Stephen Hugh - Hanna, S. - Jones, P.H. - Priolo, F. - Gucciardi, P. G. - Marago, O. M.
Photonic Torque Microscopy of the Nonconservative Force Field for Optically Trapped Silicon Nanowires.
Nano Letters. Roč. 16, č. 7 (2016), s. 4181-4188. ISSN 1530-6984. E-ISSN 1530-6992
R&D Projects: GA ČR GB14-36681G
Institutional support: RVO:68081731
Keywords : optical tweezers * silicon nanowires * nonequilibrium dynamics * Brownian motion
Subject RIV: BH - Optics, Masers, Lasers
Impact factor: 12.712, year: 2016

We measure, by photonic torque microscopy, the nonconservative rotational motion arising from the transverse components of the radiation pressure on optically trapped, ultrathin silicon nanowires. Unlike spherical particles, we find that nonconservative effects have a significant influence on the nanowire dynamics in the trap. We show that the extreme shape of the trapped nanowires yields a transverse component of the radiation pressure that results in an orbital rotation of the nanowire about the trap axis. We study the resulting motion as a function of optical power and nanowire length, discussing its size-scaling behavior. These shape-dependent nonconservative effects have implications for optical force calibration and optomechanics with levitated nonspherical particles.
Permanent Link: http://hdl.handle.net/11104/0263421