Optically controlled Fano resonance in hybrid fishscale metamaterial

Abstract:

The resonance features of traditional metamaterial are fixed and unable to be tuned dynamically. A hybrid fishscale metamaterial combined with integrated photoconductive silicon is proposed to realize a tunable THz Fano response. The hybrid metamaterial is composed of a metallic fishscale structure, silicon layer and polymide substrate. The tunable Fano resonance is investigated by changing the incident angle and the conductivity of silicon layer in the proposed hybrid fishscale metamaterial without or with split in the metallic arc. When the conductivity of silicon layer reaches 1×10³ S/m, the modulation depth reaches 1 at multiple THz frequencies. The proposed hybrid metamaterial offers an opportunity to achieve tunability of Fano resonance, and is of importance for active tuning, sensing in THz applications.