Figure 2

Electric field intensity (log E ² ) mode profiles in the plasmonic cavities with (a) L = 40 nm and (b) L = 120 nm. The number of electric field antinodes, m, the resonant wavelengths, λ, and the Q factors for both cavities are as follows: (a) m = 1, λ = 533 nm, Q = 36100, (b) m = 2, λ = 529 nm, Q = 38100. Q factors are calculated at 20 K. Adapted from [2].