Anapole mechanism of bound states in the continuum in symmetric dielectric metasurfaces

authored by

Izzatjon Allayarov, Antonio Calà Lesina, Andrey B. Evlyukhin

Abstract

We present a general multipole mechanism based on the lattice anapole effect leading to the excitation of high-Q resonances in dielectric metasurfaces with the simplest unit cell (i.e., a unit cell with inversion symmetry containing only one nanostructure) and irradiation conditions (i.e., normal incidence). Using multipole techniques, we show analytically and numerically that these resonances are related to the conversion of bound states in the continuum (BICs) to quasi-BICs by simply changing the metasurface period. It is also shown that BICs and quasi-BICs, in turn, are realized through destructive interference (anapole effect) between multipoles of the same parity. The main advantage of such a conversion BIC to quasi-BIC compared to those proposed earlier is that it does not require distortion of symmetric properties of metasurfaces, special conditions of irradiation, or displacement of elements in composite unit cells. The results obtained give an important insight into the physics of high-Q resonances in meta-optics and can simplify and expand the application of metasurfaces for tunable lasing, nonlinear generation, energy trapping manipulation, and enhanced sensing techniques.

Organisation(s)

Institute of Transport and Automation Technology
PhoenixD: Photonics, Optics, and Engineering - Innovation Across Disciplines
Hannover Centre for Optical Technologies (HOT)
Computational Photonics
Institute of Quantum Optics

Type

Article

Journal

Physical Review B

Volume

109

No. of pages

7

ISSN

2469-9950

Publication date

21.06.2024

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials, Condensed Matter Physics

Electronic version(s)

https://doi.org/10.1103/PhysRevB.109.L241405 (Access: Closed)