Transparent broadband metamaterial absorber enhanced by water-substrate incorporation

Abstract

In this paper, a transparent metamaterial absorber (MA) loaded with water substrate is presented, which can simultaneously achieve enhanced broadband microwave absorption and tunable infrared radiation. As a proof, the indium tin oxide (ITO) films are first introduced here as a frequency selective surface (FSS) on the top layer and reflective backplane on the ground layer. Next the distilled water combined with the polymethyl methacrylate (PMMA) substrate is employed as a hybrid substrate in the middle. Simulation and experimental measurements show that the transparent water-substrate MA can achieve broadband microwave absorption with efficiency over 90% in the frequency band of 6.4-23.7GHz, and the proposed hybrid substrate has almost no influence on its original transmittance. Moreover, owing to the available water circulation system, the infrared radiation of the proposed MA is also demonstrated to be controlled by the temperature of the injected water. Based on its multifunction and high performance, it is expected that the proposed design may find potential applications, such as glass window of stealth equipment, electromagnetic compatible buildings/facilities, etc.

Screen printing of silver nanowires: balancing conductivity with transparency while maintaining flexibility and stretchability

“…The excellent stability under mechanical deformations can be ascribed to the inherent robust properties of the Ag NWs and the stretchable transparent substrate, which is the limitation of the commonly used indium tin oxide, graphene, or pure metal as the conductive layers and glass or polymethyl methacrylate as the substrates. 41,[54][55][56] In addition to the mechanical stability, the transparency of the fabricated absorbers was measured and is depicted in Fig. S10.…”

Broadband Metamaterial Absorbers

“…Distilled water has a frequency-dispersive permittivity, which can be seen as a good candidates for broadband absorption. [89,131] Qu et al used water as the This article is protected by copyright. All rights reserved.…”

Broadband metamaterials and metasurfaces: a review from the perspectives of materials and devices

“…As the meta-absorber field evolved, interesting designs with additional functionality have also emerged. Several studies have proposed optically transparent microwave absorbers by adopting a mesh grid [94], indium tin oxide [74,89], water substrate [95], or standing-up ring resonators [96], demonstrating the applicability to important window stealth and other applications. Some studies have demonstrated broadband absorbers that are easy to fabricate [97,98].…”