Multiple-band metamaterial absorbers have been widely reported using the co-planar or layered design methods. However, these obtained absorption devices are of complex structure, large unit size, heavy weight, and time-consuming construction steps. Herein, an alternative design strategy is suggested to realize the multiple-band absorption at terahertz frequency. By introducing air gaps into the rectangular metallic patch, the original rectangular resonator can be divided into multiple sub-structures (or separated sections), and the combined effect of the localized resonance response of these sub-structures (or separated sections) gives rise to the multiple-band absorption. More importantly, the size, position and number of air gaps play the important roles in controlling the resonance performance of the absorption peaks and even in regulating the amount of the absorption peaks. Compared with the existing multiple-band absorption design strategies, the proposed approach does not increase the unit size, nor need to stack multiple layers, which provides important guidance for the design of multiple-band terahertz metamaterial absorbers with simple, compact, and easy to fabricate for full details.

使用共平面或分层设计方法已广泛报道了多频带超材料吸收体。然而，这些获得的吸收装置具有复杂的结构，大的单元尺寸，较重的重量以及耗时的构造步骤。在此，提出了一种替代设计策略，以实现太赫兹频率的多频带吸收。通过将气隙引入矩形金属片中，可以将原始矩形谐振器分为多个子结构（或分离的部分），并且这些子结构（或分离的部分）的局部共振响应的组合效应引起了多频带吸收。更重要的是尺寸 气隙的位置和数量在控制吸收峰的共振性能甚至调节吸收峰的数量方面起着重要作用。与现有的多频带吸收设计策略相比，该方法无需增加单元尺寸，也无需堆叠多层，为设计简单，紧凑，易于制造的多频带太赫兹超材料吸收体提供了重要的指导。制造完整的细节。