A simple design of a tunable ultra-broadband metamaterial absorber of terahertz (THz) radiation based on vanadium dioxide (VO2) configurations is proposed, having wide incidence angle tolerance and polarization insensitivity.
A semicylindrical microresonator with relatively simple excitation by a plane wave is studied. The resonator is formed on the base of a dielectric/metal/dielectric structure, where the wave energy penetrates into the resonator through a thin metal layer and is stored in a semicylindrical dielectric with high permittivity. The proposed microresonator combines features of Fabry-Perot and whispering-gallery-mode resonators. Dependence of radiation losses on the radius and materials are estimated by theoretical analysis, while excitation by a plane wave is shown via numerical analysis. A quality Q-factor of the resonator up to 10 can be achieved at a radius of the semicylinder of several micrometers.
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