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In order to feed powers into and extract signals from the SSPP structures efficiently, the first efficient conversion between the guided waves and SSPP waves is presented. A matching transition which possesses gradient corrugation grooves and flaring ground has been proposed to match the momentum and impedance simultaneously of the plasmonic waveguide and coplanar waveguide, to achieve low-loss transmissions.

(Picture: H. F. Ma et al. 10.1002/lpor.201300118, pp. 146–151, in this issue)