TY - JOUR
T1 - Collective excitations of hydrodynamically coupled driven colloidal particles
AU - Nagar, Harel
AU - Roichman, Yael
N1 - Publisher Copyright:
© 2014 American Physical Society.
PY - 2014/10/3
Y1 - 2014/10/3
N2 - Two colloidal particles, driven around an optical vortex trap, have been recently shown to pair due to an interplay between hydrodynamic interactions and the curved path they are forced to follow. We demonstrate here that this pairing interaction can be tuned experimentally, and we study its effect on the collective excitations of many particles driven around such an optical trap. We find that even though the system is overdamped, hydrodynamic interactions due to driving give rise to nondecaying excitations with characteristic dispersion relations. The collective excitations of the colloidal ring reflect fluctuations of particle pairs rather than those of single particles.
AB - Two colloidal particles, driven around an optical vortex trap, have been recently shown to pair due to an interplay between hydrodynamic interactions and the curved path they are forced to follow. We demonstrate here that this pairing interaction can be tuned experimentally, and we study its effect on the collective excitations of many particles driven around such an optical trap. We find that even though the system is overdamped, hydrodynamic interactions due to driving give rise to nondecaying excitations with characteristic dispersion relations. The collective excitations of the colloidal ring reflect fluctuations of particle pairs rather than those of single particles.
UR - http://www.scopus.com/inward/record.url?scp=84907855902&partnerID=8YFLogxK
U2 - 10.1103/PhysRevE.90.042302
DO - 10.1103/PhysRevE.90.042302
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AN - SCOPUS:84907855902
SN - 1539-3755
VL - 90
JO - Physical Review E - Statistical, Nonlinear, and Soft Matter Physics
JF - Physical Review E - Statistical, Nonlinear, and Soft Matter Physics
IS - 4
M1 - 042302
ER -