Fig. 1From: Electric field enhancement of coupled plasmonic nanostructures for optical amplification a Schematic of a metal-based plasmonic nanostructure (MPN) for amplifying a specific optical signal. The MPN has three resonance parts to enhance the optical signal. b SEM image of the MPN, on which silver was deposited to obtain plasmonic effects. c Dimensions of the MPN for enhancing the electric fieldBack to article page