Figure 1
From: Unveiling quasi-dark surface plasmon modes in Au nanoring cavities by cathodoluminescence
Schematic illustration and SEM images of the Au nanoring cavities. (a) Scheme of an Au nanoring cavity on a crystalline silicon substrate. The cavity is excited using electrons and then CL spectra are measured. (b–d) SEM images of our fabricated Au nanorings with different inside radii r = 60, 70 and 80 nm, and outside radii R = 2r.
