Fig. 2
From: Subwavelength core/shell cylindrical nanostructures for novel plasmonic and metamaterial devices
(a–e are adapted from [29])
Experimental demonstration of plasmonic cloaking and an invisible NW photodetector. a Scanning electron microscopy (SEM) image of a plasmonic NW device comprising a 50-nm-diameter Si NW and a 20-nm-thick gold cover. Scale bar, 100 nm. b Confocal optical microscopy image of the device in a under TM-polarized incident light illumination, with gold-coated and uncoated areas indicated as “covered” and “bare”, respectively. Scale bar, 2 μm. c Measured scattering intensity spectra from bare (green) and covered (blue) segments of the Si NW under TM-polarized light illumination. d Simulated near-field distributions around Si NW with (right) and without (left) the gold cover under the top-illuminated TM-polarized incident light at wavelength of 650 nm. Scale bar, 500 nm. e Measured spectral photocurrents of the 50-nm-diameter Si NW with (red) and without (black) the 20-nm-thick gold cover