Figure 1 | Light: Science & Applications

Figure 1

From: Fano resonance boosted cascaded optical field enhancement in a plasmonic nanoparticle-in-cavity nanoantenna array and its SERS application

Figure 1

(a) Schematic geometry of the unit cell of a two-dimensionally periodic PIC array, which is illuminated by an x-polarized plane wave under normal incidence. (b) and (c) are the numerically simulated far-field transmittance and reflectance spectra of the PIC array and the reference ENC array, respectively. The resonance peaks of the 1D+ and 1P+ cavity modes, the NP mode, and the Fano resonance are indicated by arrows. (d) The experimentally measured transmittance spectra of a fabricated PIC array and an ENC array. (e) The calculated field amplitude enhancement factor in the PIC array with respect to an increase in the gold NP diameter. (f) The simulated transmittance spectra of the PIC array with different gold NP sizes, where the Fano resonance positions are indicated by arrows.

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