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8 March 2014 Plasmonic slot nano-waveguides with flattened Luneburg lens based optical couplers
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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.
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Bayaner Arigong, Rongguo Zhou, Hyoungsoo Kim, Yuankun Lin, and Hualiang Zhang "Plasmonic slot nano-waveguides with flattened Luneburg lens based optical couplers", Proc. SPIE 8988, Integrated Optics: Devices, Materials, and Technologies XVIII, 89881L (8 March 2014);

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