Theoretical investigation of active modulation and enhancement of Fano resonance in THz metamaterials

Abstract

We have theoretically proposed electrical modulation and enhancement of Fano resonance in THz metamaterials. In order to practically realize Fano resonance based devices, resonance dips should be sharp and to be clearly detected. However, realization of Fano resonances with simultaneously high quality factor (Q) and higher spectral contrast remains a major challenge. Therefore we propose a metamaterial based device to overcome the above limitation with active tuning capability. Our simulated results show a large enhancement of surface current and electric field, which results in sharp, extremely narrow bandwidth Fano type resonances. Furthermore, a higher degree of tunability has been achieved for Fano resonance as compared to dipole resonance, which can be useful to realize advanced dynamically reconfigurable devices.