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Tracking nanoparticles in an optical microscope using caustics

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Eann A Patterson1 and Maurice P Whelan2

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An elegant method is proposed and demonstrated for tracking the location and movement of nanoparticles in an optical microscope using the optical phenomenon of caustics. A simple and reversible adjustment to the microscope generates caustics several orders of magnitude larger than the particles. The method offers a simple and relatively inexpensive method for visualizing such phenomena as the formation of self-assembled monolayers and the interaction of nanoparticles with chemically functionalized surfaces.


PACS

61.46.Df Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)

81.07.-b Nanoscale materials and structures: fabrication and characterization

Subjects

Nanoscale science and low-D systems

Dates

Issue 10 (12 March 2008)

Received 24 September 2007, in final form 17 December 2007

Published 13 February 2008



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