Abstract

The enhanced Raman scattering (ERS) performance of individual Ag nanowire (NW) tips with the shape of a bulb, a crown, a pencil, and a nanoparticle randomly decorated crown was numerically investigated by the finite element method. Their polarized surface ERS is revealed to be either anisotropic or isotropic, which is affected by the incident light wavelength and polarization and the shape of the tips. In our results, the pencil tip presents strong ERS effects with optimized ERS enhancement and lateral spatial resolution of about $0.3\times {10}^9$ and $1.3\mathrm{nm}$, respectively. Effects of the pencil tip geometry (including the shape, angle, length, and size) on its tip ERS behavior are discussed as well. The present work also holds promise for individual Ag NW tip applications in microscope and spectroscope imaging and improvement, etc.

© 2011 Optical Society of America

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