Details
| Original language | English |
|---|---|
| Article number | 2400118 |
| Number of pages | 16 |
| Journal | Laser and Photonics Reviews |
| Volume | 19 |
| Issue number | 5 |
| Publication status | Published - 4 Mar 2025 |
Abstract
Anapole states are fascinating for providing the seemingly contradictory properties of near-field enhancement and negligible scattering. These states are desirable to reduce the cross-coupling between meta-atoms in metamaterials. In dielectrics, anapoles are obtainable in simple but relatively large nanostructures. In metals, they are reported in composite designs that may not be appropriate as metamaterials' building blocks. Here, whether the anapole effect is obtainable in single and compact plasmonic nanostructures is investigated. Planar designs of plasmonic meta-atoms are presented and the anapole formation is explained using various multipole decomposition techniques. Due to the small nanostructure sizes compared to the wavelength, the toroidal dipole is small and does not play a principal role in the anapole formation. Therefore, the anapole can be qualitatively explained via destructive interference between quasi-static electric dipoles associated with complementary subvolumes of the nanostructure. The anapole meta-atom concept is tested by numerically demonstrating nearly transparent metasurfaces and metamaterials with high densities of near-field hot-spots. Moreover, strategies are discussed to tune the anapole state via polarization rotation, modification of the hosting domain, or re-design of the meta-atoms. Anapole plasmonic meta-atoms can enable metamaterials with combined local field concentration and controllable transparency for applications in nonlinear and tunable nanophotonics.
Keywords
- anapole, metamaterials, multipole decomposition, plasmonics, transparency
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Laser and Photonics Reviews, Vol. 19, No. 5, 2400118, 04.03.2025.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Anapole Plasmonic Meta-Atoms for Nearly Transparent Metamaterials
AU - Hassan, Emadeldeen
AU - Evlyukhin, Andrey B.
AU - Calà Lesina, Antonio
N1 - Publisher Copyright: © 2024 The Author(s). Laser & Photonics Reviews published by Wiley-VCH GmbH.
PY - 2025/3/4
Y1 - 2025/3/4
N2 - Anapole states are fascinating for providing the seemingly contradictory properties of near-field enhancement and negligible scattering. These states are desirable to reduce the cross-coupling between meta-atoms in metamaterials. In dielectrics, anapoles are obtainable in simple but relatively large nanostructures. In metals, they are reported in composite designs that may not be appropriate as metamaterials' building blocks. Here, whether the anapole effect is obtainable in single and compact plasmonic nanostructures is investigated. Planar designs of plasmonic meta-atoms are presented and the anapole formation is explained using various multipole decomposition techniques. Due to the small nanostructure sizes compared to the wavelength, the toroidal dipole is small and does not play a principal role in the anapole formation. Therefore, the anapole can be qualitatively explained via destructive interference between quasi-static electric dipoles associated with complementary subvolumes of the nanostructure. The anapole meta-atom concept is tested by numerically demonstrating nearly transparent metasurfaces and metamaterials with high densities of near-field hot-spots. Moreover, strategies are discussed to tune the anapole state via polarization rotation, modification of the hosting domain, or re-design of the meta-atoms. Anapole plasmonic meta-atoms can enable metamaterials with combined local field concentration and controllable transparency for applications in nonlinear and tunable nanophotonics.
AB - Anapole states are fascinating for providing the seemingly contradictory properties of near-field enhancement and negligible scattering. These states are desirable to reduce the cross-coupling between meta-atoms in metamaterials. In dielectrics, anapoles are obtainable in simple but relatively large nanostructures. In metals, they are reported in composite designs that may not be appropriate as metamaterials' building blocks. Here, whether the anapole effect is obtainable in single and compact plasmonic nanostructures is investigated. Planar designs of plasmonic meta-atoms are presented and the anapole formation is explained using various multipole decomposition techniques. Due to the small nanostructure sizes compared to the wavelength, the toroidal dipole is small and does not play a principal role in the anapole formation. Therefore, the anapole can be qualitatively explained via destructive interference between quasi-static electric dipoles associated with complementary subvolumes of the nanostructure. The anapole meta-atom concept is tested by numerically demonstrating nearly transparent metasurfaces and metamaterials with high densities of near-field hot-spots. Moreover, strategies are discussed to tune the anapole state via polarization rotation, modification of the hosting domain, or re-design of the meta-atoms. Anapole plasmonic meta-atoms can enable metamaterials with combined local field concentration and controllable transparency for applications in nonlinear and tunable nanophotonics.
KW - anapole
KW - metamaterials
KW - multipole decomposition
KW - plasmonics
KW - transparency
UR - http://www.scopus.com/inward/record.url?scp=85210525644&partnerID=8YFLogxK
U2 - 10.1002/lpor.202400118
DO - 10.1002/lpor.202400118
M3 - Article
AN - SCOPUS:85210525644
VL - 19
JO - Laser and Photonics Reviews
JF - Laser and Photonics Reviews
SN - 1863-8880
IS - 5
M1 - 2400118
ER -