Research On Flexible And Foldable Metamaterial Absorber Based On MACP

Metamaterials are artificial composite materials composed of ordered or disordered arrangement of subwavelength units,with unique electromagnetic properties that natural materials do not have.The shape,size,orientation,and arrangement of metamaterials endow them with the ability to change the amplitude,phase,polarization,propagation mode,and other properties of incident electromagnetic waves.Among many applications related to metamaterials,metamaterial absorbers have attracted widespread attention due to their excellent absorbing properties,and play an important role in sensing,stealth,photothermal and other fields.In this paper,metamaterial absorbers are studied from three aspects:theory,simulation and experiment.The main contents are as follows:1.In order to solve the shortcomings of the current metamaterial absorber,such as inflexibility and inability to fold,a flexible and foldable metamaterial absorber was designed and fabricated by MACP(Matrix-Assisted Catalytic Printing)technology.In this paper,the electromagnetic properties and absorbing principles of the designed metamaterial absorber are analyzed,the influence of structural parameters on the absorption performance is studied,and it is proved that it has the characteristics of polarization insensitivity and angle insensitivity.The advantages,principles and process flow of MACP technology are expounded;The absorbing samples were successfully fabricated by MACP technology,and their absorbing properties were measured.The experimental results show that the metamaterial absorber has excellent absorbing performance near 10.2 GHz,which are close to the simulation results.Compared with most metamaterial absorbers,this metamaterial absorber has the advantages of being altrathin,flexible,and foldable,and can be conformally attached to irregular and complex planes,so it can be used for energy collection and electromagnetic shielding in non-planar scenarios.2.A metamaterial absorber based on MoS2 is designed and its absorption spectrum is simulated and analyzed.It has two absorption bands in the visible light range,and the absorption rates are 98%and 99%,respectively.The interaction between the electromagnetic wave and this structure is analyzed through the field distribution.Due to the rotational symmetry of the structure,its absorbing property is almost unchanged when the polarization angle is changed,so it has good polarization insensitivity.By adjusting the structural parameters,the absorption band of the absorber can be changed,so it has good scalability in the visible light range.