Characterizing Concentrated, Multiply Scattering, and Actively Driven Fluorescent Systems with Confocal Differential Dynamic Microscopy

Peter J. Lu, Fabio Giavazzi, Thomas Angelini, Emanuela Zaccarelli, Frank Jargstorff, Andrew B Schofield, James Wilking, Mark Romanowsky, David Weitz, Roberto Cerbino

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

We introduce confocal differential dynamic microscopy (ConDDM), a new technique yielding information comparable to that given by light scattering but in dense, opaque, fluorescent samples of micron-sized objects that cannot be probed easily with other existing techniques. We measure the correct wave vector q-dependent structure and hydrodynamic factors of concentrated hard-sphere-like colloids. We characterize concentrated swimming bacteria, observing ballistic motion in the bulk and a new compressed-exponential scaling of dynamics, and determine the velocity distribution; by contrast, near the coverslip, dynamics scale differently, suggesting that bacterial motion near surfaces fundamentally differs from that of freely swimming organisms.

Original languageEnglish
Article number218103
Number of pages5
JournalPhysical Review Letters
Volume108
DOIs
Publication statusPublished - 22 May 2012

Fingerprint

Dive into the research topics of 'Characterizing Concentrated, Multiply Scattering, and Actively Driven Fluorescent Systems with Confocal Differential Dynamic Microscopy'. Together they form a unique fingerprint.

Cite this