Periodically tunable dual band terahertz electromagnetically-induced transparency of twisted tetramer metasurface.

Abstract

Rapid growth in twist-optics is pushing the boundaries of metasurfaces of twisted photonic structures. Herein, we propose a tetramer-configured metasurface of twisted double split-ring resonators (DSRRs) by a random forest algorithm. A machine learning approach that exhibits periodically tunable polarization-insensitive electromagnetically induced transparency (EIT). The experimental data show a high-quality factor quasi-bound states in the continuum (quasi-BIC) in the terahertz regime. The role of multipoles on EIT and BIC effects is revealed by the coupled Lorentz oscillators (CLO) model. Our results manifest a new approach to tuning the terahertz EIT and BIC effect at ambient conditions.