Abstract
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.
Highlights
Metamaterial absorbers, as an important branch of metamaterial-based resonant devices, have attracted wide attention because of their near-perfect absorption to the incident beam, ultra-thin dielectric layer thickness, and adjustable operating performance [1,2,3]
In the process of realization, an air gap needs to be introduced into the original rectangular patch resonator
Because of the different positions of the two air gaps into the rectangular patch, the original rectangular patch resonator can be divided into three separated metallic sections, of which the left section has the longest length, the right section is the second, and the middle section is the smallest
Summary
Metamaterial absorbers, as an important branch of metamaterial-based resonant devices, have attracted wide attention because of their near-perfect absorption to the incident beam, ultra-thin dielectric layer thickness, and adjustable operating performance [1,2,3]. The single-band absorption peak frequency exhibits blue-shift with the increase of the rectangular patch length (l) This resonance feature gives us the opportunity to design multipleband metamaterial absorber by introducing air gaps into the rectangular patch so that the rectangular patch resonator can be divided into several separated sections with different lengths. The combined effect of the localized resonance response of each separated section should provide the possibility of realizing the multiple-band absorption This advantage of this method is that it does not increase the structure size of the absorption device and or need to stack multiple metallic resonators, so this strategy has a lot of merits over traditional design methods of co-planar or layered, such as small size or compact structure design, ultra-thin, light weight and easy to fabricate. These results indicate that triple-band absorption with specific resonance frequencies (or application demands) can be realized by independently adjusting the parameters of the air gap
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