Fig. 1: Reflectance of unpatterned and patterned PdCoO2 thin films on sapphire.
From: Infrared plasmons in ultrahigh conductive PdCoO2 metallic oxide
a Reflectance of the as-grown, unpatterned film of PdCoO2. The inset in the right upper side shows the bare reflectance of PdCoO2 extracted through RefFit program. b Scanning electron microscope (SEM) image of the W = 1 μm patterned film. The bar-size is 5 μm. c Reflectance of the four patterned films, with the radiation electric field parallel to the ribbons (left column) and perpendicular to the ribbons (right column). Arrows indicate approximately the frequency location of surface plasmon excitations. d Optical microscope images of the four patterned films with different widths W and periods 2 W. All the images have the same dimensions. Brighter parts are related to the oxide film, while darker regions are associated to the sapphire substrate.
