Numerical Study of Ultra-Broadband Metamaterial Perfect Absorber Based on Four-Corner Star Array

Abstract

In recent years, research on solar absorbers provides a significant breakthrough to solve the energy crisis. A perfect solar absorber based on a four-corner star array is designed and the absorption performance is analyzed numerically. The results show that the absorber reaches more than 90% of the full band in the range of 400–2000 nm. In particular, the absorption efficiency of the continuous more than 95% of the bandwidth reached 1391 nm, and the average absorption efficiency of the whole study band is more than 98%, and the loss of the solar spectrum only accounted for 2.7%. At the same time, the absorption efficiency can be adjusted by changing the geometric structure of the absorber. In addition, due to the perfect symmetry of the structure, it has an excellent insensitivity of the incident angle and polarization angle. In general, the proposed solar absorber has exciting prospects in solar energy collection and utilization, photothermal conversion and other related fields.

Structures, principles, and properties of metamaterial perfect absorbers

“…Therefore, the ultra-wideband absorption of this model is a combination of different microstructures and higher-order resonance modes. Cheng et al 51 proposed to increase the absorption bandwidth by increasing the resonance mechanism. The structure is a quadrangular star array.…”

Optimizing the design of ultra-broadband perfect absorber based on hexagonal lattice of titanium (Ti) parabolic nanoarrays

“…In addition, titanium is not as pricey as precious metals. Ti exhibits good plasmonic resonance and significant intrinsic loss in the visible (VIS) to near-infrared (NIR) range, which is conducive to the amplification of plasmonic absorption in this spectral range [23,25]. The requirements of solar thermal photovoltaic systems can be met by these features.…”

Tunable ultrawideband perfect absorber based on vanadium dioxide

“…These devices have contributed to the development of the application of metamaterials. Absorbers, as one of the extremely important types, have potential applications in solar thermal energy harvesting, 6 optical switching, 7 electromagnetic stealth, 8 etc. After the emergence of tunable single-peak narrow-band absorbers, 9 double-band, 10 multiband, 11 and broadband absorbers 12 have become the hot research topics in recent years.…”