Figure 5
From: Unveiling quasi-dark surface plasmon modes in Au nanoring cavities by cathodoluminescence
The influence of the ratio of the Au nanorings and the energy of electron beam on CL. The thickness of the Au nanoring h = 50 nm, the electron beam is incident at the position of (r + R)/2 and the energy of electron beam is 30 keV for (a–c). (a) Calculated CL spectra for nanorings with a constant width of 50 nm and different inside radii r. (b) Calculated CL spectra for nanorings with a constant effective radius of (r + R)/2 = 120 nm and different width w. (c) The relationship between the ratio parameter w/[(r + R)/2] and the resonant wavelength, which is extracted from (a) and (b). (d) The influence of the energy of electron beam for an r = 80 nm, w = 80 nm nanoring cavity.
