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Resonant slot nanoantennas for surface plasmon radiation in optical frequency range
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View: Figures


Image of FIG. 1.
FIG. 1.

(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.

Image of FIG. 2.
FIG. 2.

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).

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

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.

Image of FIG. 5.
FIG. 5.

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.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Resonant slot nanoantennas for surface plasmon radiation in optical frequency range