Details
| Original language | English |
|---|---|
| Article number | L241405 |
| Number of pages | 7 |
| Journal | Physical Review B |
| Volume | 109 |
| Issue number | 24 |
| Publication status | Published - 21 Jun 2024 |
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.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Physical Review B, Vol. 109, No. 24, L241405, 21.06.2024.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Anapole mechanism of bound states in the continuum in symmetric dielectric metasurfaces
AU - Allayarov, Izzatjon
AU - Calà Lesina, Antonio
AU - Evlyukhin, Andrey B.
N1 - Publisher Copyright: © 2024 American Physical Society.
PY - 2024/6/21
Y1 - 2024/6/21
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85196839136&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.109.L241405
DO - 10.1103/PhysRevB.109.L241405
M3 - Article
AN - SCOPUS:85196839136
VL - 109
JO - Physical Review B
JF - Physical Review B
SN - 2469-9950
IS - 24
M1 - L241405
ER -