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Exploiting long-ranged order in quasiperiodic structures for broadband plasmonic excitation
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View: Figures


Image of FIG. 1.
FIG. 1.

SEM images of the (a) periodic, (b) Fibonacci, and (c) randomized slit arrangements. A, B, and D represent slit separation distances. The structures are illuminated by p-polarized light with the E-field lying in the plane of the slit arrangements, as shown in the inset.

Image of FIG. 2.
FIG. 2.

Transmission spectra obtained from the (a) periodic, (b) quasiperiodic, and (c) randomized slit arrays. We use normal (round) arrows to indicate the excitation wavelength of the SPP modes predicted using Eq. (1) on the air-gold (glass-gold) interface. Parts (d) to (f) show the structure factor for the structures corresponding to (a) to (c). The horizontal axis is plotted in units of . In (e) , , , and correspond to equal to 0.42, 0.67, 1.08, and 1.67, respectively.

Image of FIG. 3.
FIG. 3.

The transmission spectra from the Fibonacci arrangements for different average slit-to-slit distances. The arrows indicate the predicted wavelength for the excitation of a SPP. Normal (round) arrows correspond to a plasmonic coupling resonance at the glass-gold (air-gold) interface, via , the rightmost (square) arrow corresponds to a excitation at the glass-gold interface. At the left side, the cross (diamond) headed arrow corresponds to on the air (glass) interface. In the inset we compare a typical resonance in the spectrum of the Fibonacci arrangement (solid line) and the spectrum of the grating (dashed line), both with .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Exploiting long-ranged order in quasiperiodic structures for broadband plasmonic excitation