Abstract

A random access scanning microscope system was built to track the Brownian motion of submicrometer colloidal particles in all three dimensions. Transverse tracking resolutions of 20 nm were achieved for 1-ms clock rates. Based on mean-square displacements, the diffusion coefficient and hence the size of the individual particles was determined. Even better size resolution was demonstrated through the measurement of an axial drift motion, which was induced by radiation pressure. This experiment was simplified, if the particles could be trapped transversally by ponderomotive optical forces. The degree of trapping was directly observable from histograms of particle positions.

© 1992 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Optimal tracking of a Brownian particle

Alexander P. Fields and Adam E. Cohen
Opt. Express 20(20) 22585-22601 (2012)

3D tracking the Brownian motion of colloidal particles using digital holographic microscopy and joint reconstruction

Nicolas Verrier, Corinne Fournier, and Thierry Fournel
Appl. Opt. 54(16) 4996-5002 (2015)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (9)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (13)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription