Miroshnichenko, A.E.; Evlyukhin, A.B.; Yu, Y.F.; Bakker, R.M.; Chipouline, A. et al.: Nonradiating anapole modes in dielectric nanoparticles. In: Nature Communications 6 (2015), 9069. DOI:
https://doi.org/10.1038/ncomms9069
Zusammenfassung: |
Nonradiating current configurations attract attention of physicists for many years as possible models of stable atoms. One intriguing example of such a nonradiating source is known as "anapole". An anapole mode can be viewed as a composition of electric and toroidal dipole moments, resulting in destructive interference of the radiation fields due to similarity of their far-field scattering patterns. Here we demonstrate experimentally that dielectric nanoparticles can exhibit a radiationless anapole mode in visible. We achieve the spectral overlap of the toroidal and electric dipole modes through a geometry tuning, and observe a highly pronounced dip in the far-field scattering accompanied by the specific near-field distribution associated with the anapole mode. The anapole physics provides a unique playground for the study of electromagnetic properties of nontrivial excitations of complex fields, reciprocity violation and Aharonov-Bohm like phenomena at optical frequencies. © 2015 Macmillan Publishers Limited. All rights reserved.
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Lizenzbestimmungen: |
CC BY 4.0 Unported - https://creativecommons.org/licenses/by/4.0/
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Publikationstyp: |
Article |
Publikationsstatus: |
publishedVersion |
Erstveröffentlichung: |
2015 |
Schlagwörter (englisch): |
electromagnetic field, irradiance, nanoparticle, optical method, physics, toroidal field, anapole mode, chemical structure, controlled study, dielectric constant, dipole, electric field, electromagnetic field, light scattering, nanofabrication, particle size, refraction index
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Fachliche Zuordnung (DDC): |
500 | Naturwissenschaften
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