Bianisotropy for light trapping in all-dielectric metasurfaces

authored by
Andrey B. Evlyukhin, Vladimir R. Tuz, Valentyn S. Volkov, Boris N. Chichkov
Abstract

Magnetoelectric dipole coupling effects in all-dielectric metasurfaces composed of particles with bianisotropic electromagnetic response are investigated. This bianisotropic response is associated with the trapped mode excitation. Maintaining the trapped mode resonant conditions allows one to sufficiently increase the quality factor and reduce radiation losses in all-dielectric nanostructures (metasurfaces). An analytical model accounting for the contributions of both electric and magnetic dipole moments induced in particles by external electromagnetic fields is proposed. We show how bianisotropy can lead to the excitation of the trapped mode in metasurfaces. This mode corresponds to the electromagnetic coupling between the out-of-plane particle dipole moments, which do not radiate collectively from the metasurface plane resulting in the enhanced storage of electromagnetic energy. Our approach reveals a physical mechanism of the trapped mode excitation and demonstrates that the specially initiated bianisotropy of particles enables the energy flow between external electromagnetic waves and the trapped mode. Due to this bianisotropy, one can control the process of light-matter interaction and energy storage in all-dielectric metasurfaces via excitation of trapped modes.

Organisation(s)
Institute of Quantum Optics
QuantumFrontiers
External Organisation(s)
Jilin University
Moscow Institute of Physics and Technology
Lebedev Physical Institute of the Russian Academy of Sciences (LPI RAS)
Type
Article
Journal
Physical Review B
Volume
101
ISSN
2469-9950
Publication date
13.05.2020
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.101.205415 (Access: Closed)