Figure 1

Schematic illustration of the blue-shifted resonance and Fano coupling in periodic metallic nanostructures under oblique-angle incidence. (a) Schematic illustration demonstrates the blue-shifted resonance in periodic metallic nanostructures under oblique-angle incidence. The upper panel shows the illustration of bulk refractive index sensitivity and the decay length as a function of the resonance wavelength. (b) Schematic illustration demonstrates the blue-shifted Fano resonance in periodic metallic nanostructures under oblique-angle incidence.