Design Of Coherent Perfect Absorber Based On Metamaterial

With the development of information and communication technology,the development of new artificial electromagnetic materials is becoming more and more rapid,and various new electromagnetic devices based on new artificial electromagnetic materials are emerging one after another.The coherent perfect absorbing material is a newly proposed absorbing material that works under two electromagnetic waves that are relatively incident.The artificial electromagnetic material utilizes the reflection,transmission and phase shifting mechanisms of the material to cause the electromagnetic waves to coherently cancel,and the external electric field or magnetic field amplitude is zero.This new electromagnetic material has broad application prospects.The coherent perfect absorbing material is a kind of absorbing material that works under two electromagnetic waves that are relatively incident which was proposed recently.This metamaterial utilizes the phase shift mechanism for reflection and transmission of the material to cause the incident wave to coherently cancel,and the external electric field or magnetic field amplitude is zero.When the reflected wave and the incident wave in the same direction of the material reach the coherent cancellation condition,the electromagnetic wave will coherently cancel.Based on this,a fishnet-like coherent perfect wave absorbing device is designed to achieve the perfect coherent absorbing.Based on this,the copper surface width,thin plate thickness,incident wave incident angle and incident wave polarization are discussed.The influence of factors such as the way on the perfect absorption of coherence.In order to solve the problem that the coherent perfect absorbing can’t achieved at different incident angles,we calculate the anisotropic material parameters that achieve the perfect absorption of coherence at the same frequency at different incident angles in an analytical way.In order to realize the coherent perfect absorption of electromagnetic waves with different polarization modes,we designed a coherent perfect wave absorbing device based on a kind of polarization conversion structure,which can realize coherent perfect absorption under the irradiation of the polarized incident wave in x direction and the incident polarized wave in y direction.The results obtained are innovative and have some reference value for researchers in this field.