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Optical characterization for nearly spherical gold colloidals via their polarization response

[+] Author Affiliations
Bassam M. Al-Qadi, Toshiharu Saiki

School of Integrated Design Engineering, Keio University, 3-14-1 Hiyoshi, Yokohama, Kanagawa-Ken 211-0034 Japan

J. Nanophoton. 3(1), 039503 (October 12, 2009). doi:10.1117/1.3257622
History: Received July 20, 2009; Revised October 4, 2009; Accepted October 5, 2009; October 12, 2009; Online October 12, 2009
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Abstract

We optically characterized colloidal gold nanoparticles using polarized light scattering which is utilized to investigate both optical anisotropy and aspect ratio of the particle and to observe particle's rotational dynamics. By monitoring time-trace of the polarized scattering from a particle, we could observe rotational dynamics as fluctuations in the measured anisotropy. With typical particle dimension of 97 nm, the maximum anisotropy was measured experimentally to be 0.1 to 0.5, and with comparison to our analytical model, this range is equivalent to an aspect ratio range of 1 to 1.3, which reveals that the colloidals are predominately spherical as predicted by transmission electron microscope (TEM) images analysis. Our method has the advantage to be simple, easy to implement, and can yield access to different projections of the particle due to its rotation. Polarized light scattering can be an ultrasensitive measure for biosensing applications.

© 2009 Society of Photo-Optical Instrumentation Engineers

Topics

Gold ; Polarization

Citation

Bassam M. Al-Qadi and Toshiharu Saiki
"Optical characterization for nearly spherical gold colloidals via their polarization response", J. Nanophoton. 3(1), 039503 (October 12, 2009). ; http://dx.doi.org/10.1117/1.3257622


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