Brownian motion of graphene.
Brownian motion is a manifestation of the fluctuation-dissipation theorem of statistical mechanics. It regulates systems in physics, biology, chemistry, and finance. We use graphene as prototype material to unravel the consequences of the fluctuation-dissipation theorem in two dimensions, by studying the Brownian motion of optically trapped graphene flakes. These orient orthogonal to the light polarization, due to the optical constants anisotropy. We explain the flake dynamics in the optical trap and measure force and torque constants from the correlation functions of the tracking signals, as well as comparing experiments with a full electromagnetic theory of optical trapping. The understanding of optical trapping of two-dimensional nanostructures gained through our Brownian motion analysis paves the way to light-controlled manipulation and all-optical sorting of biological membranes and anisotropic macromolecules.
CNR-Istituto per i Processi Chimico-Fisici, I-98158 Messina, Italy. marago@me.cnr.it
Onofrio M
OM
Maragó
Francesco
F
Bonaccorso
Rosalba
R
Saija
Giulia
G
Privitera
Pietro G
PG
Gucciardi
Maria Antonia
MA
Iatì
Giuseppe
G
Calogero
Philip H
PH
Jones
Ferdinando
F
Borghese
Paolo
P
Denti
Valeria
V
Nicolosi
Andrea C
AC
Ferrari