Optically transparent dual-band microwave chiral metamaterial based on ITO strips

In this paper, an optically transparent dual-band microwave chiral metamaterial based on indium tin oxide (ITO) strips is proposed. The rotation angle and length of the three ITO strips on the structural layer can be varied to generate two independent frequency bands in the circular dichroism (CD) spectrum. The maximum CD value is 0.72, and the optical transmittance reaches 64%. The experimental and simulation results are largely in agreement. Moreover, a designed optically transparent 2D microwave image encoder is proposed as a potential application. The proposed device has considerable potential for application in the fields of signal transmission, information coding, and homeland security.