Electric and magnetic dipolar response of germanium nanospheres: interference effects, scattering anisotropy, and optical forces

By Raquel G'omez-Medina, B. García-Cámara, Irene Su'arez-Lacalle, F. Gonz'alez, F. Moreno, M. Nieto-Vesperinas, J. J. S'aenz. 2011

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Thecoherentcombinationofelectricandmagneticresponsesisthebasisoftheelectro- magnetic behavior of new engineered metamaterials. The basic constituents of their meta-atoms usually have metallic character and consequently high absorption losses. Based on standard "Mie" scattering theory, we found that there is a wide window in the near-infrared (wavelengths 1t o 3μm), where light scattering by lossless submicrometer Ge spherical particles is fully described by their induced electric and magnetic dipoles. The interference between electric and magneticdipolarfieldsisshowntoleadtoanisotropicangulardistributionsofscatteredintensity, including zero backward and almost zero forward scattered intensities at specific wavelengths, which until recently was theoretically established only for hypothetically postulated magnetodi- electric spheres. Although the scattering cross section at zero backward or forward scattering is exactly the same, radiation pressure forces are a factor of 3 higher in the zero forward condition.

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Citations in the corpus

• Nonlinear optics in all-dielectric nanoantennas and metasurfaces: a review (2019, background): “Mie resonators featuring both electric and magnetic responses are seen as a promising platform capable of leading to a practical realization of the Kerker conditions(103,104) (suppression of the backscattered field under given conditions) with nonmagnetic materials.(105,106) An experimental”