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20 April 2024 |
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Seeing the unseen: observation of an anapole with dielectric nanoparticles | | Andrey E. Miroshnichenko
; Andrey B. Evlyukhin
; Ye Feng Yu
; Reuben M. Bakker
; Arkadiy Chipouline
; Arseniy I. Kuznetsov
; Boris Lukyanchuk
; Boris N. Chichkov
; Yuri S. Kivshar
; | | Date: |
30 Nov 2014 | | Abstract: | Nonradiating current configurations attract attention of physicists for many
years as possible models of stable atoms in the field theories. One intriguing
example of such a nonradiating source is known as anapole (which means without
poles in Greek), and it was originally proposed by Yakov Zeldovich in nuclear
physics. Recently, an anapole was suggested as a model of elementary particles
describing dark matter in the Universe. Classically, 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. | | Source: | arXiv, 1412.0299 | | Services: | Forum | Review | PDF | Favorites | |
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