Multi-band metamaterial absorber based on the arrangement of donut-type resonators

Abstract

We propose multi-band metamaterial absorbers at microwave frequencies. The design, the analysis, the fabrication, and the measurement of the absorbers working in multiple bands are presented. The numerical simulations and the experiments in the microwave anechoic chamber were performed. The metamaterial absorbers consist of an delicate arrangement of donut-shape resonators with different sizes and a metallic background plane, separated by a dielectric. The near-perfect absorptions of dual, triple and quad peaks are persistent with polarization independence, and the effect of angle of incidence for both TE and TM modes was also elucidated. It was also found that the multiple-reflection theory was not suitable for explaining the absorption mechanism of our investigated structures. The results of this study are promising for the practical applications.

Broadband metamaterial perfect absorber obtained by coupling effect

“…12,14 However, the MPAs often tend to a narrow absorption bandwidth due to their resonant property, though many e®orts including by optimizing structure design have been made the broadband MPAs. [15][16][17][18][19][20][21][22][23] To achieve a broadband MPA, a common and strategic way is to combine several sub-unit element resonators with various sizes together. [15][16][17][18] But the design strategy is restricted due to the technical di±culties in fabrication, and the absorption performance is sensitive to the structure size.…”

A Wideband Wide-Angle Ultra-Thin Metamaterial Microwave Absorber

“…So far, most of the metamaterial absorbers are designed for dual band [12][13][14], triple band [15] and multiband [16] operations. Based on the concept of multiple resonances, a few monolayer designs with moderate enhancement in bandwidth have been proposed [17,18].…”

Rounding corners of nano-square patches for multispectral plasmonic metamaterial absorbers

“…Metamaterial absorbers (MMAs) are arrays of patterned metal-insulator-metal (MIM) structures that have almost perfect absorption for certain wavelengths where their impedances are perfectly matched to that of air near the resonant wavelengths. Nearly perfect MMAs are demonstrated in the microwave [10][11][12], terahertz [13,14], infrared (IR) [15][16][17][18][19][20][21][22][23] and visible regimes [24][25][26][27][28][29][30]. Metamaterial absorbers in the visible spectrum can be realized using nanoparticles on a thick metallic ground plane separated with a dielectric spacer [31][32][33].…”

“…Recently, broadband or multispectral MMAs are demonstrated in the visible and IR wavelengths using more complex geometries. Multiplexing different resonator structures in a unit cell is a route to obtain multispectral absorption which requires precise control of dimensions of multiple nanostructures [11,[37][38][39][40][41][42][43]. Multispectral MMAs based on simultaneous excitation of electric and magnetic plasmon modes are the least exploited structures [28,44,45].…”