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Fig. 6 | Nano Convergence

Fig. 6

From: Subwavelength core/shell cylindrical nanostructures for novel plasmonic and metamaterial devices

Fig. 6

(af 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 enhancement

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