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20 August 2020 Excitation of optical anapoles in dielectric nanospheres
Uttam Manna, John A. Parker, Hiroshi Sugimoto, Brighton Coe, Daneil Eggena, Minoru Fujii, Norbert F. Scherer, Stephen K. Gray
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Proceedings Volume 11462, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVIII; 114620X (2020) https://doi.org/10.1117/12.2570028
Event: SPIE Nanoscience + Engineering, 2020, Online Only
Abstract
Nonradiating anapoles are superposition of internal modes that can act as an energy reservoir by reducing the far-field scattering. We report experimental excitation of the electrodynamic anapole mode in isotropic silicon nanospheres at the optical frequencies using radially polarized beam illumination. The superposition of equal and out-of-phase amplitudes of the Cartesian electric and toroidal dipoles produces by a pronounced dip in the scattering spectra with the scattering intensity almost reaching zero – a signature of anapole excitation. The total scattering intensity associated with the anapole excitation is found to be more than 10 times weaker, and the internal energy is found to be 6 times greater for illumination with radially vs. linearly polarized beams. Our approach provides a simple, straightforward alternative path to realize electrodynamic anapole mode at the optical frequencies.
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Uttam Manna, John A. Parker, Hiroshi Sugimoto, Brighton Coe, Daneil Eggena, Minoru Fujii, Norbert F. Scherer, and Stephen K. Gray "Excitation of optical anapoles in dielectric nanospheres", Proc. SPIE 11462, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVIII, 114620X (20 August 2020); https://doi.org/10.1117/12.2570028
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KEYWORDS
Dielectrics
Laser scattering
Scattering
Electrodynamics
Superposition
Silicon
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