Broadband perfect absorption enabled by using terahertz metamaterial resonator

摘要

Broadband metamaterial perfect absorbers are of paramount importance in many applications. However, these broadband absorbers are typically based on complex structure designs, the manufacturing process of them is highly challenging. This paper shows that a fairly simple structure formed by a rectangular metallic patch with two rectangular holes backed by two layers of dielectric sheet and metallic mirror is utilized to obtain the broadband absorption. The structure possesses three different but similar resonance peaks, and the superposition of them can realize a bandwidth of 1.00 THz with absorption >80%. The absorber physical origin is elucidated by means of the corresponding field distributions of the three absorption modes. Furthermore, the device bandwidth can be tuned via changing the sizes of the resonator. These absorption properties using the simple structure design can benefit a wide range of applications.