Manipulating the optical properties of pyramidal nanoparticle arrays

Joel Henzie, Kevin L. Shuford, Eun Soo Kwak, George C. Schatz, Teri W. Odom

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

This paper reports the orientation-dependent optical properties of two-dimensional arrays of anisotropic metallic nanoparticles. These studies were made possible by our simple procedure to encapsulate and manipulate aligned particles having complex three-dimensional (3D) shapes inside a uniform dielectric environment. Using dark field or scattering spectroscopy, we investigated the plasmon resonances of 250-nm Au pyramidal shells embedded in a poly(dimethylsiloxane) (PDMS) matrix. Interestingly, we discovered that the scattering spectra of these particle arrays depended sensitively on the direction and polarization of the incident white light relative to the orientation of the pyramidal shells. Theoretical calculations using the discrete dipole approximation support the experimentally observed dependence on particle orientation with respect to incident field. This work presents an approach to manipulate-by hand-ordered arrays of particles over cm2 areas and provides new insight into the relationship between the shape of well-defined, 3D particles and their supported plasmon resonance modes.

Original languageEnglish
Pages (from-to)14028-14031
Number of pages4
JournalJournal of Physical Chemistry B
Volume110
Issue number29
DOIs
Publication statusPublished - Jul 27 2006

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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