Wideband dual polarized fractal metamaterial absorber for millimeter-wave bolometers

Review of Broadband Metamaterial Absorbers: From Principles, Design Strategies, and Tunable Properties to Functional Applications

“…This section focuses on some of the most extensive applications of BMAs, namely, energy harvesting, [72,525] photodetectors, [526][527][528][529][530][531][532][533][534][535] radar-IR dual stealth, [536][537] and bolometers. [538][539][540][541][542][543][544][545][546] Some other essential applications are also presented, including broadband manipulation of mechanical resonance, [547] noise absorbing, [548][549][550][551] imaging, [35,36,[552][553][554] and fabric wearable. [555][556][557][558][559][560] By systematically summarizing the applications of BMAs, the reader can quickly grasp the current hot spots of BMAs application research and simultaneously improve on the shortcomings and further broaden the application scopes of BMAs.…”

“…[599] All of these require a radiometer to ensure the smooth operation; thus, the combination of broadband, high absorption, polarization insensitive, wide-angle tolerance, and other excellent characteristics of BMAs could maximize the application potentials. [538][539][540][541][542][543][544][545][546] For example, using Si 3 N 4 , a microbolometer with an integrated IR BMA was proposed in the experiment with the structure shown in Figure 22a. [538] Figure 22b,c compare the performance of this device with that of a normal Si 3 N 4 absorber.…”

“…[ 599 ] All of these require a radiometer to ensure the smooth operation; thus, the combination of broadband, high absorption, polarization insensitive, wide‐angle tolerance, and other excellent characteristics of BMAs could maximize the application potentials. [ 538–546 ]…”

“…By integrating the split ring and metal disk, its absorption bandwidth, attributed to the coupling absorption peaks of different patterns, could be effectively increased, providing a solution for broadband THz sensing and real‐time imaging at room temperature. Additionally, a fractal MA with more than 84% absorption in the 100–1000 GHz range for millimeter‐wave bolometer applications was given, [ 546 ] it is based on the array of second‐order‐modified‐Sierpinski‐carpet on top of Si substrate. Its bolometer efficiency is proportional to absorption bandwidth and inversely proportional to the thickness of absorption layer, which coincides with the design concept of a thin absorption device having large bandwidth.…”

An ultra-broadband and wide-angle absorber based on a TiN metamaterial for solar harvesting

“…A metamaterial is an artificial material consisting of metallic and dielectric subwavelength structures arranged in a periodic array, 1,2 which has extraordinary electromagnetic properties not possessed by natural materials. Metamaterial perfect absorbers (MPAs) have been extensively studied in the past few years since they were first reported by Landy et al 3 It has been developed in numerous fields, including solar cells, 4,5 plasma sensors, 6–8 detectors, 9,10 radiothermometers, 11,12 thermal emitters, 13,14 and imaging devices. 15–17 By changing the structural parameters of the absorbers, the effective permittivity and permeability of the structural material can be adjusted to match the impedance with the incident medium, thus achieving perfect absorption of light.…”