Large angle electromagnetic induced reflection – Like of phase coupled eccentric ring in metasurface

Abstract

Electromagnetic induced reflection (EIR)-like is a phenomenon of electromagnetic induced transparency(EIT) -like has potential applications in optical delay lines, slow light devices and high sensitivity sensors. In this paper, a metasurface structure composed of four eccentric rings was designed. And the reflection and magnetic field distributions are investigated by finite integral method in time domain method. The results show that the EIR-like effect was obtained by designed structure through tuned the phase of eccentric rings. The equivalent impedance of the structure was calculated by inversion method. And the multipole scattering spectrum was calculated by the theory of multipole scattering to further explain the EIR-like effect. The influence of the structural parameters on the reflection illustrates the EIR-like effect was studied. To further explore the potential application of the phenomenon, the effect of the large angle on the EIR-like was also studied. The results show that the structure has a large angle of polarization insensitive EIR-like effect. The structure has potential applications in terahertz optical communication, terahertz sensing and reflector.