The High-Order Toroidal Moments and Anapole States in All-Dielectric Photonics

authored by

Egor A. Gurvitz, Konstantin S. Ladutenko, Pavel A. Dergachev, Andrey B. Evlyukhin, Andrey E. Miroshnichenko, Alexander S. Shalin

Abstract

All-dielectric nanophotonics attracts ever increasing attention nowadays due to the possibility of controlling and configuring light scattering on high-index semiconductor nanoparticles. It opens a room of opportunities for designing novel types of nanoscale elements and devices, and paves the way for advanced technologies of light energy manipulation. One of the exciting and promising prospects is associated with utilizing the so-called toroidal moment, being the result of poloidal currents excitation, and anapole states, corresponding to the interference of dipole and toroidal electric moments. Here, higher-order toroidal moments of both types (up to the electric octupole toroidal moment) are presented and investigated in detail via the direct Cartesian multipole decomposition allowing new near- and far-field configurations to be obtained. Poloidal currents can be associated with vortex-like distributions of the displacement currents inside nanoparticles, revealing the physical meaning of the high-order toroidal moments and the convenience of the Cartesian multipoles as an auxiliary tool for analysis. High-order nonradiating anapole states accompanied by the excitation of intense near-fields are demonstrated. It is believed that the results are of high importance for both the fundamental understanding of light scattering by high-index particles and a variety of nanophotonics applications and light governing on nanoscale.

Organisation(s)

Institute of Quantum Optics
PhoenixD: Photonics, Optics, and Engineering - Innovation Across Disciplines

External Organisation(s)

St. Petersburg National Research University of Information Technologies, Mechanics and Optics (ITMO)
RAS - Ioffe Physico Technical Institute
Moscow Power Engineering Institute
National University of Science and Technology MISIS
Moscow Institute of Physics and Technology
University of New South Wales (UNSW)
Ul'Yanovsk State University

Type

Article

Journal

Laser and Photonics Reviews

Volume

13

No. of pages

13

ISSN

1863-8880

Publication date

08.05.2019

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials, Atomic and Molecular Physics, and Optics, Condensed Matter Physics

Electronic version(s)

https://doi.org/10.48550/arXiv.1810.04945 (Access: Open)
https://doi.org/10.1002/lpor.201800266 (Access: Closed)