Strong magnetic response of submicron Silicon particles in the infrared
Year: 2011
Type: article
Abstract: High-permittivity dielectric particles with resonant magnetic properties are being explored as constitutive elements of new metamaterials and devices. Magnetic properties of low-loss dielectric nanoparticles in the visible or infrared are not expected due to intrinsic low refractive index of optical media in these regimes. Here we analyze the dipolar electric and magnetic response of lossless dielectric spheres made of moderate permittivity materials. For low material refractive index (<∼3) there are no sharp resonances due to strong overlapping between different multipole contributions. However, we find that Silicon particles with index of refraction∼3.5 and radius∼200 nm present strong electric and magnetic dipolar resonances in telecom and near-infrared frequencies, (i.e. at wavelengths≈1.2-2 mm) without spectral overlap with quadrupolar and higher order resonances. The light scattered by these Si particles can then be perfectly described by dipolar electric and magnetic fields.
Source: Optics Express
DOI: 10.1364/oe.19.004815
Authors: A. García-Etxarri, R. Gómez-Medina, L. S. Froufe-Pérez, C. López, L. Chantada, F. Scheffold, J. Aizpurua, M. Nieto-Vesperinas, J. J. Sáenz
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,270
Awards: Giovanni Boccaccio: Fiammetta in Love. Translation by Johann Engelbert Noyse. Parallel edition with the Giolito edition Venice 1565., Scattering and propagation of light in soft matter structures, Optics of Random Media: Fundamentals and new experimental tools, G2488720066, G5041320054, Nanophotonics for Energy Efficiency, G6721379577
OpenAlex ID: W1999336950