Full text loading...
(a) Sketch of an ORSA on a metal film and the excitation of SPs with an electron beam. (b) Top view of SEM of an ORSA fabricated on an Ag film with L = 300 nm and W = 60 nm. (c) The experimental panchromatic CL spectra of the ORSAs with L = 130–820 nm, W = 60 nm, and D = 300 nm.
Panchromatic CL spectra and mode patterns. (a) CL spectra of ORSAs with D = 300 nm, W = 60 nm, and L = 130, 520, and 740 nm. (b)–(f) Monochromatic CL images at the resonant peaks marked in (a).
Simulated spectra and surface electron current intensity distributions. (a) Simulated spectra of the ORSAs with L = 130, 520, and 740 nm, D = 300 nm (solid lines) and D = ∞ (dashed lines). (b)–(e) Calculated surface electron current intensity distributions for m = 1 (λ = 510 nm, L = 130 nm), 2 (λ = 776 nm, L = 520 nm), 3 (λ = 546 nm, L = 520 nm) and 4 (λ = 561 nm, L = 740 nm) modes. The sizes of the drawings in (b)–(e) are not to scale for clarity.
The dispersions for light in vacuum (black solid line), SPs at an infinite Ag/air surface (red solid curve), and ORSAs (symbols, experimental data). Inset: the effective wavelength of the ORSAs versus the resonant wavelength. The green line shows a linear fitting for the data of λ > 550 nm.
Calculated far-field angular distributions of the radiation (angular unit: degree). (a)–(d) Calculated angular distributions for m = 1, 2, 3, and 4, corresponding to Figs. 3(b)–3(e), respectively.
Article metrics loading...