期刊
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
卷 26, 期 4, 页码 732-740出版社
OPTICAL SOC AMER
DOI: 10.1364/JOSAA.26.000732
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- Swiss National Science Foundation (SNSF) [20021-116758]
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. (C) 2009 Optical Society of America
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