Conformal Transparent Metamaterials Inducing Ultra-broadband Absorption and Polarization Conversion

Abstract

A new approach for achieving ultra-broadband absorption and polarization conversion conformal transparent metamaterials (CTM) by using indium tin oxide (ITO) and anisotropic structure was proposed. The absorption conversion rate (ACR) with a high average value of 90% is achieved through CTM. The composite materials of polyethylene terephthalate (PET) and polydimethylsiloxane (PDMS) are used as intermediate dielectric layer to gain optical transparency with a transmittance of nearly 80% on the basis of flexibility. Its absorbing and polarizing conversion performances were analyzed and tested by the construction of the electromagnetic (EM) wave absorbed and shift mechanism, respectively. The nearly 50% of incident EM wave power can be absorbed, and the rest incident electromagnetic wave can be converted into EM waves with different polarizations after full-wave analyses and scientific experiments between 20.75 and 54.05 GHz. This strategy has great potential applications in interference radar detection, optimizing circularly polarized antenna, and EM stealth objects such as glazing, displays, and LCD screens that require transparency.