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In this contribution, a systematic analytical model is proposed, based on transformation optics, to investigate a general class of plasmonic nanostructures with blunt edges/corners. Comprehensive discussions will be provided on how the edge rounding at the sharp boundary affects the local field enhancement as well as the energy and bandwidth of each plasmonic resonance. Importantly, we will show that by optimizing the geometry of the nanostructure, it is possible to design a broadband light harvesting device with the absorption property robust to the edge bluntness.

plasmonics; transformation optics