Fig. 2: Optical properties of metal-dielectric-metal (MDM) cavities.
From: Non-thermal emission in gap-mode plasmon photoluminescence
a Schematic of the tapered nanowire array in the MDM geometry and representative SEM images. Cross-section of MDM structures with different dielectric layer thicknesses. b Redshifting of plasmonic resonance with decreasing spacer thickness, for an ~85-nm-wide nanowire. c Broad tunability of gap-mode resonance by varying the width of the nanowires. d Typical NPL emission spectrum.
