Plasmonic resonances and hot spots in Ag octopods

Naumov, Ivan I.; Zhiyong Li; Bratkovsky, Alexander M.
January 2010
Applied Physics Letters;1/18/2010, Vol. 96 Issue 3, p033105
Academic Journal
Silver octopod plasmonic nanoparticles have been recently synthesized with a variety of shapes. In the present letter, we demonstrate their versatile optical response using the discrete dipole approximation. There are three major resonances that can be tuned up to a large extent making them especially attractive to use in, e.g., high-performance surface enhanced Raman scattering (SERS) detectors. The excited resonant modes strongly depend on the geometrical parameters of the stars. The field “hot spots” are mostly localized at the surface between the arms and may be both “electric” (important for SERS applications) and “magnetic” in character (potentially identifiable by trapping magnetic nanoparticles in their vicinity). The results are in very good agreement with the data where available and may be used for a “shape spectroscopy” for the nanoparticles.


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