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Proceedings Paper

Fluctuation-dissipation of an active Brownian particle under confinement
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Paper Abstract

This study aims to address the question of fluctuation-dissipation relationship in a non-equilibrium system comprising active Brownian particles. Specifically, the fluctuation power spectral densities (PSD) of an Induced-ChargeElectrophoresis-driven metallic Janus particle in an optical trap was measured and compared the PSDs to that of nondriven particles. Unlike the PSDs of Brownian particles where there exists only one characteristic frequency, the PSDs of active Brownian particles have two with the second frequency characterized by the particles’ rotation diffusion. Energy dissipation of such particles, defined as the integrated PSDs were examined. Finally, Effective temperatures defined by various means, including the probability distribution of the particle's positions in the trap, and the zero-frequency limit of the fluctuation power spectral densities, are examined for the active Brownian particles.

Paper Details

Date Published: 7 September 2018
PDF: 6 pages
Proc. SPIE 10723, Optical Trapping and Optical Micromanipulation XV, 107230A (7 September 2018); doi: 10.1117/12.2325011
Show Author Affiliations
Chong Shen, Lehigh Univ. (United States)
H. D. Ou-Yang, Lehigh Univ. (United States)


Published in SPIE Proceedings Vol. 10723:
Optical Trapping and Optical Micromanipulation XV
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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