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Proceedings Paper

Depolarized scattering of silver nanostructures in dye-less sensing
Author(s): Pabak Sarkar; Tanya Shtoyko; Rafal Luchowski; Nils Calander; Aby Roth; Anne-Marie Brun-Zinkernagel; Zygmunt Gryczynski; Ignacy Gryczynski
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Paper Abstract

Scattering from noble metallic nanoparticles with specific structures are strongly depolarized in contrast to dielectric particles. The effect depends on the shape and symmetry of the nanoparticles and can be explained by induced plasmonic multi-resonances along different axes of symmetry. In our experiments we found that the scattering from 'nanorod' structures of silver is more polarized than globular colloidal silver nanostructures. The depolarized scattering can be tuned to the near-infrared region by using proportionate mixture of the colloids and nanorods. We demonstrate this effect in solution as well as in polymer films where nanoparticles were immobilized. This phenomenon of depolarized scattering is promising for designing dye-less sensing devices useful in diagnostics. We show scattering polarization profile from asymmetric nanostructures changes during their aggregation. Modulating the rate of aggregation of these nanostructures by 'receptor - ligand'-like interactions can be successfully utilized for sensitive 'dye-less' diagnostics.

Paper Details

Date Published: 12 February 2010
PDF: 7 pages
Proc. SPIE 7574, Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications VII, 75740V (12 February 2010);
Show Author Affiliations
Pabak Sarkar, Univ. of North Texas Health Science Ctr. at Fort Worth (United States)
Tanya Shtoyko, The Univ. of Texas at Tyler (United States)
Rafal Luchowski, Univ. of North Texas Health Science Ctr. at Fort Worth (United States)
Nils Calander, Univ. of North Texas Health Science Ctr. at Fort Worth (United States)
Aby Roth, The Univ. of Texas at Tyler (United States)
Anne-Marie Brun-Zinkernagel, Univ. of North Texas Health Science Ctr. at Fort Worth (United States)
Zygmunt Gryczynski, Univ. of North Texas Health Science Ctr. at Fort Worth (United States)
Ignacy Gryczynski, Univ. of North Texas Health Science Ctr. at Fort Worth (United States)


Published in SPIE Proceedings Vol. 7574:
Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications VII
Alexander N. Cartwright; Dan V. Nicolau, Editor(s)

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