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We describe a systematic methodology based on conformal transformation optics to analytically design and study plasmonic singular devices, which are capable of harvesting light over a broadband spectrum and converting the far-field energy into enhanced near field at structure singularities. Numerical simulations are performed by means of finite element method to verify the validity of quasi-static approximation assumed by the theory and predict the radiation losses effect on the light-harvesting effectiveness and superfocusing of near field energy.

Conformal Transformation Optics; Plasmonics; Nanocrescents and Nanowire Dimers; Superfocusing and Broadband Absorption