Journal article

Strong magnetic response of submicron Silicon particles in the infrared

  • García-Etxarri, A. Donostia International Physics Center (DIPC), Donostia-San Sebastian, Spain
  • Gómez-Medina, R. Instituto de Ciencia de Materiales de Madrid, Madrid, Spain
  • Froufe-Pérez, Luis S. Instituto de Ciencia de Materiales de Madrid, Madrid, Spain
  • López, C. Instituto de Ciencia de Materiales de Madrid, Madrid, Spain
  • Chantada, Laura Department of Physics, University of Fribourg, Switzerland
  • Scheffold, Frank Department of Physics, University of Fribourg, Switzerland
  • Aizpurua, J. Donostia International Physics Center (DIPC), Donostia-San Sebastian, Spain
  • Nieto-Vesperinas, M. Instituto de Ciencia de Materiales de Madrid, Madrid, Spain
  • Sáenz, Juan José Donostia International Physics Center (DIPC), Donostia-San Sebastian, Spain - Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, Spain
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    28.02.2011
Published in:
  • Optic Express. - 2011, vol. 19, no. 6, p. 4815
English 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 ∼ 200nm present strong electric and magnetic dipolar resonances in telecom and near-infrared frequencies, (i.e. at wavelengths ≈ 1.2−2mm) 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.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/302151
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