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arXiv · 1711.05558

Direct amplitude-phase near-field observation of higher-order anapole states

Vladimir A. Zenin·Andrey B. Evlyukhin·Sergey M. Novikov·Yuanqing Yang·Radu Malureanu·Andrei V. Lavrinenko·Boris N. Chichkov·Sergey I. Bozhevolnyi
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Abstract

Anapole states associated with the resonant suppression of electric-dipole scattering exhibit minimized extinction and maximized storage of electromagnetic energy inside a particle. Using numerical simulations, optical extinction spectroscopy and amplitude-phase near-field mapping of silicon dielectric disks, we demonstrate high-order anapole states in the near-infrared wavelength range (900-1700 nm). We develop the procedure for unambiguously identifying anapole states by monitoring the normal component of the electric near-field and experimentally detect the first two anapole states as verified by far-field extinction spectroscopy and confirmed with the numerical simulations. We demonstrate that higher order anapole states possess stronger energy concentration and narrower resonances, a remarkable feature that is advantageous for their applications in metasurfaces and nanophotonics components, such as non-linear higher-harmonic generators and nanoscale lasers.

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Vladimir A. Zenin, Andrey B. Evlyukhin, Sergey M. Novikov, Yuanqing Yang, Radu Malureanu, Andrei V. Lavrinenko, Boris N. Chichkov, Sergey I. Bozhevolnyi. 2017-11-16. Direct amplitude-phase near-field observation of higher-order anapole states. https://doi.org/10.1021/acs.nanolett.7b04200

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