High Q Tunable THz plasmonic Metasurface based on InSb Particles

We present a novel InSb-based metasurface design for THz plasmonic devices capable of realizing an ultra-narrow linewidth response, dynamically tunable via external stimulation. The optimized design support a SLR with an ultra-high Q factor of 2500 due to the constructive interaction of LSPRs of individual elements at the RA diffraction frequency. When a weak static magnetic field is applied, the metasurface gives rise to magneto-plasmonic modes due to Zeeman splitting effects, facilitating a multiband response. This tunable behavior makes this ultra-high Q InSb-based metasurface highly promising for various THz applications, including imaging, sensing, and lasing systems at the sub-wavelength scale.