Generation of Multiple Fano Resonances in Plasmonic Split Nanoring Dimer

Multiple higher-order Fano resonances in plasmonic hollow cylindrical nanodimer

“…The bonding quadrupolar mode overlaps with the bright superradiant dipole mode, and the destructive interference between these two modes leads to the formation of the Fano resonance. Such hybridized modes and Fano resonance are also observed in conventional nanodimers [4,9,17,28]. It is also noted that the bright dipole mode blue-shifts as we increase the value of g, whereas the dark quadrupole mode somewhat sustains its spectral position.…”

“…The sensitivity of SQO mode is 500 nm/RIU, the FoM and CR values are 17 and 47 %, respectively. Thus, our proposed design offers high values of the sensitivity, FoM and CR, which are approximately higher than some of the plasmonic nanostructures reported in [4,19,[31][32][33]. All these values reveal the performance of the Fano resonator as a biosensor.…”

“…To our knowledge, most of the conventional nanodimers support Fano resonances only for transversely polarized incident light [4,17,21]. Those nanodimers that exhibit Fano resonances for both the transversely and longitudinally polarized incident light are symmetry-reduced complex multilayered structures, which are difficult to synthesize [3,21].…”

“…He observed that destructive and constructive interferences take place due to the overlapping of a discrete state with a continuum state, which results in the asymmetric profile. Over the past few years, plasmonic nanosystems have been investigated for the generation of Fano resonances with sharp dispersion [2][3][4][5][6][7][8][9][10][11][12]. In such systems, Fano resonance arises due to the spectral overlapping of broad superradiant and narrow subradiant plasmon modes, which are usually characteristics of dipolar and higher-order plasmon modes, respectively.…”

Twin Dipole Fano Resonances in Symmetric Three-Layered Plasmonic Nanocylinder

“…Recently, these resonances are studied in all types of plasmonic nanosystems due to the potential applications in metamaterials, surface-enhanced Raman spectroscopy (SERS), sensing, and slow-light devices [2][3][4][5][6][7]. These nanostructures include nanoshells [8][9][10][11], nanocones [12,13], ring/disk nanocavities [14][15][16], dimers [17][18][19], trimers [20], and nanoparticle aggregates [21,22], where the Fano resonance arises from the destructive interference of symmetric bright mode with the asymmetric dark plasmon mode.…”