336 citations · 1k across the 12 of their papers we have counts for
8 papers · 1 filter
Measurement of second-order response without perturbation
Laurent Helden, Urna Basu, Matthias Krüger +1
We study the second order response functions of a colloidal particle being subjected to an anharmonic potential. Contrary to typical response measurements which require an external…
Direct measurement of thermophoretic forces
Laurent Helden, Ralf Eichhorn, Clemens Bechinger
We study the thermophoretic motion of a micron sized single colloidal particle in front of a flat wall by evanescent light scattering. To quantify thermophoretic effects we analyse…
Salt-induced changes of colloidal interactions in critical mixtures
Ursula Nellen, Julian Dietrich, Laurent Helden +4
We report on salt-dependent interaction potentials of a single charged particle suspended in a binary liquid mixture above a charged wall. For symmetric boundary conditions (BC) we…
Reply to Comment on "Influence of Noise on Force Measurements" [1012.5371]
Giovanni Volpe, Laurent Helden, Thomas Brettschneider +2
Having a priori knowledge of the force acting on a noisy system it is possible to solve the issue relative to the interpretation of multiplicative noise terms (aka Ito-Stratonovich…
Archimedean-like colloidal tilings on substrates with decagonal and tetradecagonal symmetry
Michael Schmiedeberg, Jules Mikhael, Sebastian Rausch +4
Two-dimensional colloidal suspensions subject to laser interference patterns with decagonal symmetry can form an Archimedean-like tiling phase where rows of squares and triangles o…
Influence of Noise on Force Measurements
Giovanni Volpe, Laurent Helden, Thomas Brettschneider +2
We demonstrate how the ineluctable presence of thermal noise alters the measurement of forces acting on microscopic and nanoscopic objects. We quantify this effect exemplarily for…