Controllable electromagnetically induced transparency in an electrically tunable terahertz hybrid metasurface

Dynamic tuning of metasurfaces with active components is a prospective solution to improve their operation bandwidth. Here, we propose and experimentally demonstrate controllable electromagnetically induced transparency (EIT)-like response in a terahertz hybrid metasurface, where the classical EIT metallic pattern is coupled to the electrical biasing silicon carrier layer. Both the conductivity and thickness of the biased silicon layer can change significantly with increasing the external current. The electrically controllable hybrid metasurface shows complete electrical switching on the EIT-like response. The hybrid metasurface employing the state transition of the biased silicon layer between insulating and conductive states yields a substitute method to solve the narrowband operation bandwidth of photonic devices, which may inspire novel innovations on highperformance active terahertz applications.

Automated summary

This paper proposes and experimentally demonstrates a controllable electromagnetically induced transparency (EIT)-like response in a terahertz hybrid metasurface. The biased silicon layer can significantly change its conductivity and thickness with increasing external current. The electrically controllable hybrid metasurface exhibits complete electrical switching on the EIT-like response. The use of the biased silicon layer provides an alternative method to overcome the narrowband operation bandwidth of photonic devices, which may inspire new innovations in high-performance terahertz applications.