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)

BibTeX

@article{5207b8a6a775417b82af0ef3e8999a40,
title = "Anapole mechanism of bound states in the continuum in symmetric dielectric metasurfaces",
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.",
author = "Izzatjon Allayarov and {Cal{\`a} Lesina}, Antonio and Evlyukhin, {Andrey B.}",
note = "Publisher Copyright: {\textcopyright} 2024 American Physical Society.",
year = "2024",
month = jun,
day = "21",
doi = "10.1103/PhysRevB.109.L241405",
language = "English",
volume = "109",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Institute of Physics",
number = "24",
}