Anomalous vibrational dispersion in holographically trapped colloidal arrays

Marco Polin; David G. Grier; Stephen R. Quake

doi:10.1103/PhysRevLett.96.088101

Anomalous vibrational dispersion in holographically trapped colloidal arrays

Marco Polin, David G. Grier, Stephen R. Quake

Research output: Contribution to journal › Article › peer-review

Abstract

Colloidal spheres localized in an array of harmonic wells form a thermally excited, viscously damped dynamical system capable of supporting propagating elastic waves. Experimentally realized with micrometer-scale polystyrene spheres localized in a line of holographic optical traps, the hydrodynamically coupled array's behavior is quantitatively explained by a model based on the Oseen superposition approximation. The spheres' purely dissipative coupling is predicted to mediate a crossover to a regime of underdamped propagating elastic waves with uniformly negative group velocities that has yet to be verified experimentally.

Original language	English (US)
Article number	088101
Journal	Physical Review Letters
Volume	96
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevLett.96.088101
State	Published - 2006

ASJC Scopus subject areas

General Physics and Astronomy

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10.1103/PhysRevLett.96.088101

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abstract = "Colloidal spheres localized in an array of harmonic wells form a thermally excited, viscously damped dynamical system capable of supporting propagating elastic waves. Experimentally realized with micrometer-scale polystyrene spheres localized in a line of holographic optical traps, the hydrodynamically coupled array's behavior is quantitatively explained by a model based on the Oseen superposition approximation. The spheres' purely dissipative coupling is predicted to mediate a crossover to a regime of underdamped propagating elastic waves with uniformly negative group velocities that has yet to be verified experimentally.",

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AB - Colloidal spheres localized in an array of harmonic wells form a thermally excited, viscously damped dynamical system capable of supporting propagating elastic waves. Experimentally realized with micrometer-scale polystyrene spheres localized in a line of holographic optical traps, the hydrodynamically coupled array's behavior is quantitatively explained by a model based on the Oseen superposition approximation. The spheres' purely dissipative coupling is predicted to mediate a crossover to a regime of underdamped propagating elastic waves with uniformly negative group velocities that has yet to be verified experimentally.

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Anomalous vibrational dispersion in holographically trapped colloidal arrays

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