A dual-band metamaterial absorber with adjacent absorption peaks

Abstract

A kind of nearly perfect metamaterials absorber (MMA) with super-close dual bands is designed and fabricated at microwave frequency. This super-compact and space saving structure integrates a cross-shaped resonator (CSR) and complementary cross-shaped resonator (CCSR) in one unit cell, corresponding to lower and higher resonances, respectively. This dual-band polarization-insensitive MMA operates well with a wide range of incident angles for TE polarization. On the other hand, the higher absorptive resonance is highly sensitive for TM polarization with oblique incident angles over 15°. Besides the surface current, field and power loss density distributions, effective material parameters are analyzed to figure out the physical mechanism of absorption. Furthermore, the influences of absorption intensity and resonant frequency by changing the geometric dimensions of the structure and thickness of the dielectric substrate have also been discussed. The experimental results agree well with numerical simulations and this definite polarization (TM) insensitive absorber with super-close bands can be applied in high sensitivitivy/resolution absorption detectors, switchable absorption devices between dual and single band, and sensors with TE or TM EM waves under oblique incidence.

Design of a dual-band terahertz metamaterial absorber using two identical square patches for sensing application

“…For example, coplanar structural design methods consisting of multiple sub-resonators were given to show two distinct absorption peaks in the specic resonance frequency region. [18][19][20][21][22][23][24][25][26] Dual-band metamaterial absorbers were also demonstrated using the stacked structural design methods. [27][28][29][30][31][32][33][34] Other structural designs were also suggested to achieve the dual-band absorption performance, including cuboid ferrite particle, 35 circular sector resonator, 36 graphene-SiC hybrid system, 37 cylinder MoS 2dielectric array, 38 and asymmetric double-split ring resonators.…”

Multiple-Band Terahertz Metamaterial Absorber Using Multiple Separated Sections of Metallic Rectangular Patch

“…Multiple-band metamaterial absorbers mean that they enable perfect absorption at several discrete frequency points. According to the number of frequency points [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28], the multiple-band absorption devices can be divided into dual-band absorption, triple-band absorption, quad-band absorption, and even more. In terms of design ideas, the principles of these multiple-band metamaterial absorbers are similar that they are resulted from the combined effect of the single resonance response of each metallic resonator.…”

“…In terms of implementation modes, the realization of the multiple-band metamaterial absorbers usually has two methods. One of which is the co-planar design method for placing multiple sub-resonators [9][10][11][12][13][14][15][16][17][18][19][20][21]. However, this type of design is at the expense of increasing the interaction of the subarrays (resulting in weak absorption strength) and expanding the unit size (resulting in large and non-compact structure size).…”

“…The performance of the multiple-band absorption shows a significant dependence on the gap sizes, number, as well as the gap position in the rectangular patch. Compared with the existing design technologies of realizing multiple-band absorption [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28], the multiple-band absorption device has some superior features, especially it does not increase the transverse and longitudinal dimensions of the basic cell, so it can effectively avoid the coupling effect of the sub-structures in the large-sized co-planar design method and can avoid the timeconsuming fabrication steps and complex structure faced in the layered design approach. Therefore, the multiple-band terahertz metamaterial absorber should have a wide range of application prospects in the terahertz technology related fields, including terahertz imaging, terahertz detection, terahertz sensing, etc.…”

A Polarization-insensitive Dual-band Plasmonic Metamaterial Absorber for a Sensor Application

“…Recently, plasmonic metamaterials with their unordinary properties have obtained important progress due to their promising applications such as bio-sensor, absorbers, filters and photonic modulators [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Most of these applications greatly benefit from the unique properties of the sub-wavelength metallic structure supporting localized surface plasmonic resonance modes [16][17][18][19][20][21][22][23][24][25][26][27]. For these metamaterials devices, metamaterial absorbers have attracted much attention because of their excellent properties and wide applications [28][29][30][31].Generally, metamaterial absorber can be classified as broadband and narrowband type according to their different application requirements.…”