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On the basis of transformation optics, we present an analytical approach to systematically study and design a general class of singular plasmonic structures, and discuss their applications in broadband light harvesting and nanofocusing. Our analysis shows that the SP spectrum of a singular nano-particle is identical to that of an infinite metallo-dielectric system, and is therefore continuous rather than discrete. Detailed investigation will be presented on how the field enhancement and light harvesting property of singular structures can be tailored by tuning the geometries.

plasmonics; nanophotonics