Fig. 4: Experimental hole diameter sweep.
From: Covert infrared image encoding through imprinted plasmonic cavities
Top-view scanning electron microscope images of the hole diameters of the fabricated plasmonic systems, visible and infrared spectrometer measurements, and infrared images of the a–d MWIR and e–h LWIR devices. Solid lines for the reflectance spectra are measured values, whereas dotted lines are obtained by FDTD simulations. Line colors for the visible spectra are obtained from the CIE chromaticity matching functions
