Dual band Vis-IR absorber using bismuth based helical metamaterial surface

Abstract

In this study authors worked to attain a metamaterial absorber for visible and infrared region using bismuth as its main constituent material. Proposed absorber would be used for various applications; solar cell, communication etc. To model the metamaterial surface, two different sets of materials are used to observe and compare the absorption, having metal-insulator-metal structure to observe the metamaterial. It is observed that proposed metamaterial layer having Al/TiO2/Bi, displays high absorption for two bands in different wavelength region with wide bandwidth. Absorption peaks are observed at 510 nm and 1590 nm. However, apart from the peaks, absorption is not less than 0.5 a.u. anywhere in the absorption spectrum, which depicts that this absorber can be used for whole wavelength range varies from 200 to 2500 nm. Designed absorber in this study also ensures the easy fabrication of the metamaterial surface due to its less complex design and small geometry, which ensures the stability of three dimensional structure.

High Absorptivity and Ultra-Wideband Solar Absorber Based on Ti-Al2O3 Cross Elliptical Disk Arrays

“…Among them, more than 99% high absorption is achieved at 547.7 nm, 702.2 nm and 1092.3 nm. A comparison with some recent solar absorbers is shown in Table 1 [8,[35][36][37][38][39][40], the proposed absorber clearly obtained the widest absorption bandwidth. The finite difference time domain method is used in the simulation with 3D FDTD solutions software [29,30].…”

“…Spectral Region with Absorption More than 90% Pattern Materials [8] 200-1000 nm (800 nm) Alternate stacked Au/Cr/Graphene/TMDs [35] 300-1015 nm (715 nm) Wavy surface Indium tin oxide-Ge-Cu [36] 400-850 nm (450 nm) Cubes Au/MoS 2 [37] 250-1100 nm (850 nm) Disk and Nanoparticles Au/HfO 2 [38] 287-628 nm (341 nm) Disk Si/Ni [39] 380-760 nm (475 nm) Half-cylinder air cavity TiO 2 [40] 200-2500 nm (peak absorbance lower than 90% In order to verify the utilization effect of our high absorptivity absorber on solar en ergy, we used the AM1.5 solar radiation spectrum to simulate the lighting conditions o the real environment, and calculated the performance of the proposed absorber in the ac tual situation. The calculation method of solar energy absorption efficiency is referred to in this equation [41][42][43]:…”

“…Through the electromagnetic field distribution diagram, we can intuitively understand the physical mechanism of the ultra-wideband perfect absorption of the absorber, and optimize the structure according to its distribution. This method has often been used in previous studies [40][41][42][43][44][45]. We calculated the electric and magnetic field distribution to explore the physical mechanism of our solar absorber at three resonance wavelengths, 547.7 nm, 702.2 nm and 1092.3 nm, as presented in Figures 4 and 5.…”

“…More than 90% [8] 200-1000 nm (800 nm) Alternate stacked Au/Cr/Graphene/TMDs [35] 300-1015 nm (715 nm) Wavy surface Indium tin oxide-Ge-Cu [36] 400-850 nm (450 nm) Cubes Au/MoS2 [37] 250-1100 nm (850 nm) Disk and Nanoparticles Au/HfO2 [38] 287-628 nm (341 nm) Disk Si/Ni [39] 380-760 nm (475 nm) Half-cylinder air cavity TiO2 [40] 200-2500 nm (peak absorbance lower than 90%) Helical Bismuth Proposed 385-1765 nm (1380 nm) Cross elliptical disk Ti/Al2O3…”

Switchable Dual-Functional Metasurface for THz Absorption and Electromagnetically Induced Transparency

“…Ding et al proposed a metasurface switch between a wideband absorber and a reflective half wave plate [27]. Relevant applications include metamaterial absorber [29] realized in visible and near infrared bands, upper material photoluminescence forming absorber [30], absorption transmission measurement in closed environment [31] and nano-imprinted metasurface [32]. However, some proposed structure neglect to protect the VO 2 materials from oxidation [12,[26][27][28].…”