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Pseudo-anapole regime in terahertz metasurfaces
File(s)
Author(s)
Cojocari, Maria
Ospanova, Anar K
Chichkov, Vladimir
Navarro-Cia, Miguel
Gorodetsky, Andrei
Type
Journal Article
Abstract
We present the numerical, theoretical, and experimental study of a terahertz metasurface supporting a pseudo-anapole. Pseudo-anapole effect arises when electric and toroidal dipole moments both tend to a minimum, instead of destructive interference between electric and toroidal dipole moments in conventional anapole mode. Such overlap allows resonance suppression of electric type radiation. Thus it becomes possible to study the multipoles of other families and higher order excitations. We estimate multipole contribution to the metasurface response via the multipole expansion method. The series is extended with such terms as mean-square radii and multipole interference. We also study the metasurface geometrical tunability. Via scaling, we demonstrate that it is possible to control the metasurface toroidal and electric responses independently. This in turn proves the fact that these multipoles have different physical origin. Moreover, we demonstrate that the proposed metasurface allows excitation of coherent magnetic dipole and electric quadrupole modes, which is crucial for planar cavities and lasing spasers in nanophotonics.
Date Issued
2021-08-15
Date Acceptance
2021-07-14
Citation
Physical Review B: Condensed Matter and Materials Physics, 2021, 104 (7)
URI
DOI
ISSN
1098-0121
Publisher
American Physical Society
Journal / Book Title
Physical Review B: Condensed Matter and Materials Physics
Volume
104
Issue
7
Copyright Statement
©2021 American Physical Society.
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000681426900005&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Technology
Physical Sciences
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Materials Science
Physics
RESONANCES
FIELD
Publication Status
Published
Article Number
ARTN 075408
Date Publish Online
2021-08-05