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Surface integral formulation for 3D simulations of plasmonic and high permittivity nanostructures

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Abstract

Among the most popular approaches used for simulating plasmonic systems, the discrete dipole approximation suffers from poorly scaling volume discretization and limited near-field accuracy. We demonstrate that transformation to a surface integral formulation improves scalability and convergence and provides a flexible geometric approximation allowing, e.g., to investigate the influence of fabrication accuracy. The occurring integrals can be solved quasi-analytically, permitting even rapidly changing fields to be determined arbitrarily close to a scatterer. This insight into the extreme near-field behavior is useful for modeling closely packed particle ensembles and to study “hot spots” in plasmonic nanostructures used for plasmon-enhanced Raman scattering.

© 2009 Optical Society of America

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