Abstract
In this paper, we propose a combined metasurface consisting of an aluminum substrate and an array of TiO2 blocks to achieve a wideband terahertz absorber. We incorporated several similar dielectric blocks with different side length into each unit cell. Each dielectric block could cause magnetic-resonance-inducing absorption effect with different peak wavelengths. Thus, our combined metasurface could achieve wider absorption frequency band than the traditional design when these dielectric blocks were properly designed. The absorption bandwidth could be widened nearly 2.5 times and 5 times compared to a single block case when there were four and nine blocks, respectively, andcouldbe further improved by increasing the number of combinations in structures (variable parameters included number, spacing, dimensions etc.). For both TE00 (the electric fields of the light polarized along the y-axis) and TM00 (the electric fields of the light polarized along the x-axis) polarization states, the absorption bandwidth could be widened effectively; even when the incident angle was 45°, the absorption rate could still reach about 75%. This structure is simple and easy to fabricate, and this design concept can also be used in various other application fields.
Highlights
The use of absorbers can reduce or eliminate the interference of complex electromagnetic environment on wireless communications
We propose a wideband terahertz metasurface absorber based on a simple structure that combines resonators of the same shape and different sizes in one unit cell to broaden the absorption bandwidth of the metamaterial absorber
We propose a combined metasurface consisting of an aluminum substrate and an array of TiO2 blocks to achieve a wideband terahertz absorber
Summary
The use of absorbers can reduce or eliminate the interference of complex electromagnetic environment on wireless communications. Traditional metamaterial absorbers are based on the electromagnetic dipole of the resonator, which limits the working frequency band of the absorber. Metasurface absorbers based on Salisbury Screen [22] have been reported These thick and bulky multilayered structures make it difficult for the absorbers to integrate with commercial. As far as we know, the idea of combining different structures into one unit cell has appeared in other fields, we rarely see reports that widen the absorption bandwidth based on this scheme. We propose a wideband terahertz metasurface absorber based on a simple structure that combines resonators of the same shape and different sizes in one unit cell to broaden the absorption bandwidth of the metamaterial absorber. The absorption bandwidth could still be widened when the polarization of the incident light changed; when the incident angle was 45◦ , the absorption rate could still reach about 75%
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