Fig. 6From: Subwavelength core/shell cylindrical nanostructures for novel plasmonic and metamaterial devices(a–f are adapted from [37])Enhanced second harmonic generation from CdS NWs coupled to plasmonic nanocavities. a Schematic illustration of a plasmonic NW device for enhanced SHG comprising a nonlinear CdS NW covered with Ag nanocavity. The fundamental wave (ω) is illuminated through the glass substrate while collecting the back-scattered second harmonic (2ω) signals. Inset shows an SEM image of the fabricated plasmonic NW device. b Dark-field optical microscopy image showing SHG signals (blue) from a CdS NW coupled to a Ag nanocavity device (yellow dashed rectangle). c Calculated electric field intensity distribution (I ω = |E ω|2) of the fundamental wave. d Estimated SHG conversion efficiencies as a function of SHG wavelength emitted from plasmonic nanocavity-integrated (black) and bare (red, ×100) CdS NWs. e, f Size- and wavelength-dependent SHG power and enhancementBack to article page