Tuning multiple Fano resonances in plasmonic pentamer clusters

Abstract

Multiple Fano resonances in plasmonic pentamer clusters composed of nanorings are observed and investigated. Molecular point group theory is used to understand the formation of multiple Fano resonances. By modifying the radius of the center ring or the angle between the center and the surrounding rings, the modulation depths and the spectral positions of the multiple Fano resonances can be tuned within a wide range. For pentamers composed of split nanorings, another Fano resonance can be excited because of the excitation of the quadrupole mode of the surrounding split nanorings.

Multiple Fano Resonances Structure for Terahertz Applications

“…A structure which shows several Fano resonances at different frequencies is very useful for multi-frequency sensing applications. While single Fano resonance comes from combination of one bright mode and one dark mode, combining a bright mode with several dark modes can result in several Fano resonances [10][11][12][13][14][15]. Here, we propose a new planar structure which shows five Fano resonances at the terahertz frequencies.…”

Thermally tunable fano resonance of a conductive rubber‐based metamaterial

“…The tunability of Fano resonance has also been the subject of considerable attention in recent years. The modulation depths and spectral positions of multiple Fano resonances have been tuned over a wide range by adjusting the geometrical parameters of nanoring clusters . Both the Fano resonance amplitude and frequency of hybrid graphene‐metal gratings have been shown to be adjustable by tuning the Fermi energy of the graphene and the geometrical parameters of the gratings .…”

Tunable Fano resonances in heterogenous Al–Ag nanorod dimers

“…Fano resonance has been extensively studied in many nanoparticle aggregates formed by the same metal, in which the nanoparticle size, spacing between the nanoparticles, symmetry of the aggregates, and incident light polarization directions all give rise to the tuning of Fano resonance [13][14][15][16][17][18][19][20][21]. Fano resonance has also been reported to a lesser extent in heterogenous nanostructures constituted by nanoparticles of different metals, theoretically and experimentally, mainly concentrating on Au-Ag heterodimers [22][23][24][25][26][27].…”

“…Among various novel plasmonic phenomena, Fano resonance in metallic complex nanostructures from the destructive interference between a broad super-radiant bright mode and a narrow sub-radiant dark mode has attracted extensive research attention due to its narrow and asymmetric lineshape and sensitivity to structural and environmental parameters, showing potential applications in plasmonic sensing and surface enhanced Raman scattering [13][14][15]. Fano resonance has been extensively studied in many nanoparticle aggregates formed by the same metal, in which the nanoparticle size, spacing between the nanoparticles, symmetry of the aggregates, and incident light polarization directions all give rise to the tuning of Fano resonance [13][14][15][16][17][18][19][20][21].…”