title: Triplon modes of puddles.
abstract: Free fluctuations of the contact line of large drops ("puddles") of wavelength lambda > kappa(-1), the capillary length, cannot be seen on a solid substrate because even a small but finite hysteresis is enough to block these slow modes. We show here that vertical vibrations of the substrate (at frequency omegaE, acceleration Lambda) above a threshold amplitude Lambda(c) release the line and excite contour oscillations (triplons). We observe harmonic modes and parametric excitations at omegaE/2. We construct the phase diagram (Lambda, omegaE) of these subharmonic modes and we study their growth dynamics: they slow down near the threshold of the contour instability.
authors.affiliation: Physico-Chimie Curie, UMR 168 Institut Curie/CNRS, 11 rue Pierre et Marie Curie 75231 Cedex 05 Paris, France.
authors.forename: X
authors.initials: X
authors.lastname: Noblin
authors.forename: A
authors.initials: A
authors.lastname: Buguin
authors.forename: F
authors.initials: F
authors.lastname: Brochard-Wyart