Phase mismatch induced suppression of eigenmode resonance in terahertz metasurfaces

In this paper, we observe the distinguishable modulation of the different eigenmodes by lattice mode in terahertz U-shaped metasurfaces, and a remarkable lattice induced suppression of the high order eigenmode resonance is demonstrated. With the quantitative analysis of Q factor and loss of the resonances, we clarify that the peculiar phenomenon of suppression is originated from the phase mismatch of the metasurfaces via introducing the phase difference between the neighboring structures. These results provide new insights into the phase mismatch mediated transmission amplitude of eigenmode resonance in metasurfaces and open a new path to developing terahertz multifunctional devices. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Automated summary

In this paper, the distinguishable modulation of different eigenmodes by lattice mode in terahertz U-shaped metasurfaces is observed, and a remarkable suppression of high order eigenmode resonance induced by the lattice is demonstrated. By quantitatively analyzing the Q factor and loss of the resonances, it is clarified that the peculiar phenomenon of suppression originates from the phase mismatch introduced by the phase difference between neighboring structures. These results provide new insights into the phase mismatch mediated transmission amplitude of eigenmode resonance in metasurfaces and open a new path for developing terahertz multifunctional devices.