Toroidal quasi-dark supermodes in microwave dielectric metasurfaces
Abstract
We report a class of dielectric metasurfaces that support quasi-dark microwave resonances with tailored toroidal and antitoroidal field profiles. The metasurfaces are realized using quadrumers of high-permittivity and low-loss ceramic disk resonators as elementary building blocks, assembled on laser-processed dielectric foam substrates. The physical origin and symmetry properties of the supported modes are elucidated through group-theoretical analysis and validated by eigenfrequency and full-wave finite-element simulations. Experimental measurements confirm the existence of quasi-dark resonances with suppressed radiation losses. Owing to its generic and scalable design strategy, this approach can be readily extended to a broad range of dielectric metasurfaces composed of ceramic Mie resonators. The demonstrated metasurfaces provide a versatile platform for low-profile and strongly resonant devices, e.g., for sensing or narrowband filtering.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (6)
K. Ntokos
School of Electrical and Computer Engineering, Aristotle University of Thessaloniki (AUTH) 1 , Thessaloniki GR-54124,
A. Politikou
School of Electrical and Computer Engineering, Aristotle University of Thessaloniki (AUTH) 1 , Thessaloniki GR-54124,
G. Nousios
School of Electrical and Computer Engineering, Aristotle University of Thessaloniki (AUTH) 1 , Thessaloniki GR-54124,
V. Dmitriev
Electrical Engineering Department, Federal University of Pará 2 , Belém 66075-900,
E. E. Kriezis
School of Electrical and Computer Engineering, Aristotle University of Thessaloniki (AUTH) 1 , Thessaloniki GR-54124,
D. C. Zografopoulos
School of Electrical and Computer Engineering, Aristotle University of Thessaloniki (AUTH) 1 , Thessaloniki GR-54124,