Fano Resonances Generated in a Single Dielectric Homogeneous Nanoparticle with High Structural Symmetry

Abstract

Fano resonances in plasmonic nanostructures suppress radiative losses effectively, but non-radiative Ohmic losses limit the performance of many important applications. In addition, it is hard to generate strong Fano resonances in a single plasmonic homogeneous nanoparticle with high structural symmetry. Dielectric nanostructures offer a potential solution to the above issues. There are various subradiant hybrid modes in a single dielectric nanoparticle, making it possible to generate Fano resonances. This study shows that due to the excitation of the subradiant hybrid EH 12δ mode, a strong Fano resonance is generated in a single silicon nanodisk. Higher order subradiant hybrid modes (EH 13δ and EH 14δ ) are excited by manipulating the disk radius, and multiple Fano resonances arise in spectra. These optical responses are not dependent on retardation effect, and strong Fano resonances are generated even for a very thin disk. One can get similar results in a single dielectric triangle, square, or rectangle nanoplate. The simple geometry and high structural symmetry make these dielectric nanoparticles promising for practical implementations in biosensing and optoelectronics.

All-Dielectric Nanophotonics: Fundamentals, Fabrication, and Applications

“…The Fano resonance [50,123,124] is known to originate from the interference of two scattering channels, one of which is non-resonant, while the other is strongly resonant. Fano resonance was observed in different areas of physics, including photonics, plasmonics, and metamaterials [125].…”

Observation of Double Fano Interference in Metal-Insulator Block Arrays

“…To pattern nanoparticles in periodic arrays can have a profound impact on significant field enhancement over large volumes and, in particular, it can enable the excitation of otherwise dark modes to generate Fano resonances [3][4][5][6][7][8]. These more promising optical features may enable a diverse range of practical applications, including optical filtering [9], sensing [10,11], polarization selectors [12], lasers [13], and switching [14].…”

Antenna resonances in low aspect ratio semiconductor nanowires

“…They observed a red-shift with longer cylinders for the magnetic dipole, electric dipole and magnetic quadrupole modes, which saturates as the height exceeds twice the diameter. Cai et al [48] established the profile for hybrid electromagnetic modes in nanodisk structures, and compared these to waveguiding modes. Recently, Ee et al [49] investigated the dependence of the TM 01 and TM 11 waveguiding modes on the length of silicon nanoblocks under normally incident light.…”