Session H32: Focus Session: Computational Nanoscience III
11:15 AM–1:51 PM, Tuesday, March 14, 2006
Baltimore Convention Center Room: 329
Sponsoring Units:
DCOMP DMP
Chair: Byounghak Lee, Lawrence Berkeley National Laboratory
Abstract ID: BAPS.2006.MAR.H32.5
Abstract: H32.00005 : Design of Nano-Ears for Surface Enhanced Raman Scattering
12:27 PM–12:39 PM
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Abstract 
Authors:
Fernando A. Reboredo
Chad E. Talley
Stephen M. Lane
(Lawrence Livermore National Laboratory)
Metallic structures optimized for surface enhanced Raman scattering (SERS) must combine i) large dipole moments, for stronger coupling with the external field E, and ii) highly localized plasmon modes, which increase Raman Scattering cross sections (proportional to E4) and improve spatial resolution. Since typical molecules are much smaller than the visible wave lengths, the design of nanostructured surfaces for SERS involves an electro-dynamical problem analogous to the one solved with ear shapes in acoustics. In this limit, retardation effects can be ignored, which reduces the problem to the response at the metal surface. We have developed a finite element computational tool that allows the calculation of surface plasmons on arbitrary metallic shapes. We have found that an accurate description of the surface curvature is crucial. Our numerical results agree with exact analytical solutions for the quasi-static model known for spheres and spherical shells. Using this method, we have compared several shapes, where analytical results are not available, and uncover ear-shaped structures that are 12 orders of magnitude more efficient than spheres.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2006.MAR.H32.5