Demonstration of Magnetic Dipole Resonances of Dielectric Nanospheres in the Visible Region

• Published in: Nano letters Vol. 12; no. 7; pp. 3749 - 3755
• Main Authors: Evlyukhin, Andrey B, Novikov, Sergey M, Zywietz, Urs, Eriksen, René Lynge, Reinhardt, Carsten, Bozhevolnyi, Sergey I, Chichkov, Boris N
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 11.07.2012
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Dielectric constant; Exact sciences and technology; Excitation; Fullerenes and related materials; Magnetic dipoles; Magnetic resonance; Materials science; Nanocrystalline materials; Nanoparticles; Nanoscale materials and structures: fabrication and characterization; Nanospheres; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Permittivity; Physics; Silicon; Spectra; Visible and ultraviolet spectra; Dielectric nanoparticles; metamaterials; optical magnetism; magnetic dipole; Mie resonance; Nanoparticles; Spin waves; Light scattering; Resonance frequency; Magnetic resonance; Visible spectra; Nanosphere; Silicon; Permittivity; Metamaterial; Nanostructured materials
• ISSN: 1530-6984; 1530-6992; 1530-6992
• DOI: 10.1021/nl301594s

Strong resonant light scattering by individual spherical Si nanoparticles is experimentally demonstrated, revealing pronounced resonances associated with the excitation of magnetic and electric modes in these nanoparticles. It is shown that the low-frequency resonance corresponds to the magnetic dipole excitation. Due to high permittivity, the magnetic dipole resonance is observed in the visible spectral range for Si nanoparticles with diameters of ∼200 nm, thereby opening a way to the realization of isotropic optical metamaterials with strong magnetic responses in the visible region.