Magnetic response of planar dielectric rings

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

“…However, electromagnetic fields could be accessible in small gaps in-side high refractive index particles [18]. Note, that the magnetic responses of particles with hollows had been considered previously [14,[19][20][21][22], but only with the view of scattering problem, while magnetic field concentration had not been investigated. In this Letter we investigate the magnetic field distribution inside silicon nanocylinders with and without coaxial through holes.…”

Water: Promising Opportunities For Tunable All-dielectric Electromagnetic Metamaterials

“…All-dielectric metamaterials 1 are an attractive alternative to the resonant metal-based photonic structures due to smaller material losses. Being properly designed, such metamaterials can exhibit most of the properties of metamaterials: negative magnetic permeability 2 3 4 5 6 7 , negative 8 9 10 and zero 11 refractive index and even toroidal dipole moment 12 . Typically, all-dielectric metamaterials are composed of high-permittivity inclusions in a low dielectric matrix.…”

Applicability of point-dipoles approximation to all-dielectric metamaterials

“…Silicon nanodimers, exhibiting both electric and magnetic dipole responses, have recently been experimentally demonstrated to enhance electric and magnetic fields in the optical range [17]. High permittivity dielectric rings are of particular interest, because they possess a strong broadband magnetic response [18][19][20]. In addition, they have more degrees of freedom for tuning the resonance frequency by geometrical parameters than, for example, spheres, cubes or cylinders.…”

“…In addition, they have more degrees of freedom for tuning the resonance frequency by geometrical parameters than, for example, spheres, cubes or cylinders. Furthermore, they exhibit resonances on the THz frequencies [19][20][21][22], a very promising range for emerging applications. Appearing most frequently as periodical structures composed of subwavelength elements (the metamaterial lattice constant is on the order of λ/20 − λ/4), three-dimensional metamaterials are often treated as continuous media (the procedure referred to as homogenization) described by some effective parameters, e.g., permittivity ε, permeability μ, refractive index n, and impedance z, which simplifies their description.…”