Flexible Broadband Metamaterial Perfect Absorber Based on Graphene-Conductive Inks

Abstract

In this work, we proposed a flexible broadband metamaterial perfect absorber (FBMPA) by exploiting a pasted conductive-graphene ink on a polyimide substrate. For the flat FBMPA, an absorption over 90% was found to cover a wide frequency range (from 7.88 to 18.01 GHz). The high-absorption feature was polarization-insensitive and regarded as stable with respect to the oblique incidence up to 30 degrees of electromagnetic wave. The high absorption was maintained well even when the absorber was wrapped. That is, the FBMPA was attached to cylindrical surfaces (with the varying radius from 4 to 50 cm). For both flat and curved states, the absorption mechanism was explained by the perfect impedance matching and the dielectric loss of the proposed absorber. Our work provides the groundwork for the commercialization of future meta-devices such as sensors, optical filters/switchers, photodetectors, and energy converters.

Structures, principles, and properties of metamaterial perfect absorbers

“…As we all know, planar symmetric structures are the direct method to solve polarization and angle insensitive absorption. Therefore, many researchers have proposed various highly symmetric geometric shapes, such as origin crossing cross symmetry, [57][58][59] graphene pore arrays, 60 and doughnut shaped structures. 61 Based on previous designation, Hakim et al 62 designed a compact modified SSRR structure with a transverse band line (Fig.…”

A Flexible Foldable Broadband Metamaterial Absorber Fabricated by Intaglio Printing Technology

“…Although there are metamaterial absorbers * Corresponding author: Huan Lu (luhuan123@zju.edu.cn). made of special material resistance films such as ITO (indium tin oxide) combined with flexible dielectric substrates [42][43][44][45], it is still challenging to achieve conformal covering of complex irregular objects. Therefore, new flexible MAs need to be researched and developed urgently.…”

Metamaterial Perfect Absorbers for Controlling Bandwidth: Single-Peak/Multiple-Peaks/Tailored-Band/Broadband

“…The metamaterial absorbers are essentially ultrathin structures with dimensions smaller than one-tenth of the operating wavelength [21]. These structures are lightweight and highly flexible, making them easily integrated into existing electronic systems and devices [22,23]. Additionally, the fabrication process for metamaterial absorbers is highly versatile, allowing us to produce structures with varying shapes, sizes and properties [24][25][26][27].…”