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Applied Physics Letters / Volume 84 / Issue 1 / APPLIED BIOPHYSICS

Appl. Phys. Lett. 84, 154 (2004); http://dx.doi.org/10.1063/1.1637963 (3 pages)

Brownian modulated optical nanoprobes

C. J. Behrend, J. N. Anker, and R. Kopelman

Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055

(Received 13 August 2003; accepted 9 November 2003)

Brownian modulated optical nanoprobes (Brownian MOONs) are fluorescent micro- and nanoparticles that resemble moons: one hemisphere emits a bright fluorescent signal, while an opaque metal darkens the other hemisphere. Brownian motion causes the particles to tumble and blink erratically as they rotate literally through the phases of the moon. The fluctuating probe signals are separated from optical and electronic backgrounds using principal components analysis or images analysis. Brownian MOONs enable microrheological measurements on size scales and timescales that are difficult to study with other methods. Local chemical concentrations can be measured simultaneously, using spectral characteristics of indicator dyes embedded within the MOONs. © 2004 American Institute of Physics.

© 2004 American Institute of Physics

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KEYWORDS and PACS

Keywords

nanoparticles, Brownian motion, spectral analysis, dyes, optical modulation, viscosity measurement

PACS

  • 61.46.-w

    Structure of nanoscale materials

  • 06.30.-k

    Measurements common to several branches of physics and astronomy

  • 83.85.Jn

    Viscosity measurements

  • 83.10.Mj

    Molecular dynamics, Brownian dynamics

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1637963

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    J. N. Anker and R. Kopelman, Appl. Phys. Lett. 82, 1102 (2003)APPLAB000082000007001102000001.

    J. N. Anker, C. Behrend, and R. Kopelman, J. Appl. Phys. 93, 6698 (2003)JAPIAU000093000010006698000001.


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