数值研究一种基于腔共振和电共振的近红外双频段超材料吸收器（英文）

Numerical study of a dual-band metamaterial absorber in near infrared region based on cavity and electrical resonances

设计,数值模拟和讨论了一种具有两个宽带和扁平的吸收带的超材料吸收器,其中一个是腔共振吸收带,另一个是电共振吸收带.电共振的吸收带由于空腔尺寸(d)或者介质层厚度(H)的增加而蓝移,而腔共振吸收带则表现出红移的现象.同时,电共振和腔共振吸收带可以通过优化吸收器的结构设计耦合为一个吸收带.最后,数值模拟研究了入射角度的改变对电共振和腔共振吸收带的影响.利用不同波段的共振模式形成不同吸收带的方式提供了将双吸收带调制为单吸收带的可能性.

In this paper,we present the design,numerical simulations and analysis of a metamaterial absorber with two broad and flat absorption bands,including a cavity resonance band and an electrical resonance band. The electrical resonance band reveals a blue-shift with the width of cavity（ d） or spacer thickness（ H） increasing,while the cavity resonance band exhibits a red-shift with d or H increasing. Furthermore,electrical and cavity resonance bands can be coupled together at the same resonance wavelength to realize a single absorption band through optimizing the structure design. Finally,the effects of the variation of angles of incidence on electrical and cavity resonance bands were simulated. This method of utilizing different resonant modes for absorption bands at different wavelengths offers a simple approach to modulate dual absorption bands to single absorption band.