Depolarized scattering of silver nanostructures in dye-less sensing

Pabak Sarkar, Tanya Shtoyko, Rafal Luchowski, Nils Calander, Aby Roth, Anne Marie Brun-Zinkernagel, Zygmunt Gryczynski, Ignacy Gryczynski

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


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.

Original languageEnglish
Title of host publicationNanoscale Imaging, Sensing, and Actuation for Biomedical Applications VII
StatePublished - 3 May 2010
EventNanoscale Imaging, Sensing, and Actuation for Biomedical Applications VII - San Francisco, CA, United States
Duration: 25 Jan 201028 Jan 2010

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
ISSN (Print)1605-7422


OtherNanoscale Imaging, Sensing, and Actuation for Biomedical Applications VII
Country/TerritoryUnited States
CitySan Francisco, CA


  • Nanostructures
  • Polarization
  • Size-aspect ratio


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