Tunable circular dichroism of stretchable chiral metamaterial

Circular dichroism (CD) of a stretchable chiral metamaterial with bilayer L-shaped and T-shaped Au patterns on the Polydimethylsiloxane substrate (SCMM-BLT) is investigated theoretically. Due to the excitation of plasmonic hybridization modes, CD effect happens. SCMM-BLT can produce large optical chirality (OC) of 53.6% in mid-infrared region, and we attribute the double bands of CD to the excitation of the bonding and antibonding modes. By stretching SCMM-BLT, the bands of CD shift to longer wavelengths, which prove SCMM-BLT can be a candidate as the tunable chiral metamaterial. Our findings pave a way in designing wearable electronic devices, such as sensors.