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8 March 2014Plasmonic slot nano-waveguides with flattened Luneburg lens based optical couplers
Gradient index (GRIN) structures have attracted great interests since their invention. Especially, the recent advance in
the fields of transformation optics, plasmonics, and nanofabrication techniques has opened new directions for the
applications of GRIN structures in nano-photonic devices. In this paper, we apply Luneburg lens and its transformed
counterpart to realize efficient coupling to plasmonic nano-waveguides. We first briefly present the general structures of
Luneburg lens and generalized Luneburg lens, as well as the design process of flattened Luneburg lens applying quasiconformal
mapping techniques. After that, we study the performance of these lenses for coupling electromagnetic signals
to nano-waveguides (the metal-insulator-metal (MIM) nano-waveguide), and different schemes are investigated.