Pseudo-anapole regime in terahertz metasurfaces
Cojocari M.V. Ospanova A.K. Chichkov V.I. Navarro-Cía M. Gorodetsky A. Basharin A.A.
15 August 2021American Physical Society
Physical Review B
2021#104Issue 7
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.
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National University of Science and Technology (MISiS), Moscow, 119049, Russian Federation
Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, United Kingdom
Department of Electronic, Electrical and Systems Engineering, University of Birmingham, Birmingham, B15 2TT, United Kingdom
Department of Chemistry, Imperial College London, London, W12 0BZ, United Kingdom
ITMO University, St. Petersburg, 197101, Russian Federation
Institute for Theoretical and Applied Electromagnetics RAS, Moscow, 125412, Russian Federation
Moscow Institute of Physics and Technology, Moscow Region, Dolgoprudny, 117303, Russian Federation
National University of Science and Technology (MISiS)
Al-Farabi Kazakh National University
School of Physics and Astronomy
Department of Electronic
Department of Chemistry
ITMO University
Institute for Theoretical and Applied Electromagnetics RAS
Moscow Institute of Physics and Technology
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