Systems involving periodic arrays of metallic nanostructures have been  of much interest due to their ability to enhance the intensity of the  electric field through excitations of surface plasmons.  These  excitations occur at resonance frequencies determined by the structure's  component size, shape, and environment, making them tunable in nature  for any wavelength of interest. Here we present the theoretical modeling  of a unique structure composed of a periodic array of conical  �nano-frustums�, or beveled cylinders of alternating thin layers of  silver and dielectric material, atop a silver film.  The intent was to  design a structure capable of supporting multiple resonances.  Two and  three dimensional finite-difference time-domain (FDTD) calculations were  utilized to model the structure. Ultimately, through varying the array  periodicity and dimensions of the nano-frustums, a structure capable of  supporting resonances at 532 nm, 650 nm, and 785 nm was engineered.  The  structure exhibited maximum SERS enhancement on the order of 109 which, when compared to cylindrical nano-posts with similar size, constitutes a significant improvement.

Versatile SERS substrates using period arrays of silver conical nano-frustums

243rd National Meeting (2012)

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