Enhancement of artificial magnetism via resonant bianisotropy

Abstract

All-dielectric “magnetic light” nanophotonics based on high refractive index nanoparticles allows controlling magnetic component of light at nanoscale without having high dissipative losses. The artificial magnetic optical response of such nanoparticles originates from circular displacement currents excited inside those structures and strongly depends on geometry and dispersion of optical materials. Here an approach for enhancing of magnetic response via resonant bianisotropy effect is proposed and analyzed. The key mechanism of enhancement is based on electric-magnetic interaction between two electrically and magnetically resonant nanoparticles of all-dielectric dimer. It was shown that proper geometrical arrangement of the dimer in respect to the incident illumination direction allows flexible control over all vectorial components of the magnetic moment, tailoring the latter in the dynamical range of 100% and delivering enhancement up to 36% relative to performances of standalone spherical particles. The proposed approach provides pathways for designs of all-dielectric metamaterials and metasurfaces with strong magnetic responses.

Spectroscopy and Biosensing with Optically Resonant Dielectric Nanostructures

“…Because of their distinct properties, RDNs have been proposed for high‐harmonic generation, photonic topological insulators, boosting the luminescence from quantum emitters such as NV‐centers in nanodiamonds, quantum dots, perovskites, dye molecules, and carbon nanotubes . In addition, resonant dielectric nanostructures have been used for scattering engineering, ultrafast switchers and modulators, optical interconnections on a chip, light trapping structures, colored metasurfaces, and enhanced Raman scattering . Interesting photonic phenomena such as Fano resonances, Purcell effect, and strong coupling have been shown in dielectric nanostructures as well.…”

Magnetic field concentration with coaxial silicon nanocylinders in the optical spectral range

“…An approach for manipulating magnetic field component of light relies on adopting magnetic Mie resonances in high refractive index particles [12][13][14][15]. In this case, circular displacement currents yet in fully retarded regime, create effective magnetic dipolar and higher or-der resonances [16].…”

Asymmetric backscattering from the hybrid magneto-electric meta particle

“…Subwavelength scatterers could often be approximated analytically with a few of the leading (dipolar) terms and the related polarizabilities, which could be calculated directly from the geometry and material composition of the structure. When a structure (meta-atom hereafter) consists of several subwavelength features, the scattering problem could be solved self-consistently by employing the coupled dipoles technique [27], [28].…”