Design of ultra-broadband absorption enhancement in plasmonic absorber by interaction resonance of multi-plasmon modes and Fabry-Perot mode

Abstract

This paper shows a strategy to realize ultra-broadband absorption of multi-spectral coverage. A vertical cascaded plasmonic absorber constructed by multilayer helical metallic nanostructure wrapped in a pyramid-shaped dielectric jacket is presented and investigated by numerical simulations. By premeditated planning of the scale proportions of the spirals and the dimension size of the pyramid-shaped dielectric, more than 90% of absorption is realized in 189-3896 nm, an ultra-wide spectral range that basically covers the bands of near-ultraviolet, visible light, and near-infrared. The excitation mechanism of electromagnetic resonance and the formation process of light trapping are both included in the investigation through the analysis of electromagnetic field distribution. The localized surface plasmon mode in the metallic nano-spiral and the Fabry-Perot cavity mode with the gap plasmon resonance in the dielectric gap cooperatively make a significant contribution to reduce the reflection and form the ultra-broadband absorption. The simulation results show that the proposed absorber is basically insensitive to the incident angle and polarization angle, which basically keeps more than 90% absorption within the incident angle of ± 80 °. Such a specific implementation idea can also be applied to the terahertz region by modifying the geometrical size of the structure. This presented design implies new viability to develop the broadband photodetectors, solar cells, and thermal emitters.

Ultra-broadband infrared metamaterial absorber based on MDMDM structure for optical sensing

“…Landy et al (2008) first proposed and implemented an experimental MPA in the microwave band. Subsequent research has resulted in the utilization of MPAs in various light wavebands: microwave (Zhang et al, 2019); ultraviolet (Zeng et al, 2021;Mehrabi et al, 2022;Takashima et al, 2022;Wang et al, 2022); visible (Yu et al, 2020a;Liu et al, 2020;Issah et al, 2021); infrared (Enoch et al, 2004;Wu et al, 2020a;Zhou et al, 2021;Shi et al, 2022;Wang et al, 2024); terahertz (Cong et al, 2015;Wang et al, 2019;Wu, 2020;Zheng et al, 2022). Due to the ultra-thin structure, broadband and high absorption capacities, MPAs have been widely used in imaging (Diem et al, 2009;Tittl et al, 2015;Zhang et al, 2024), sensing (Sabah et al, 2018), and solar energy collection (Yu et al, 2020b;Lin et al, 2020).…”

Spatially selective narrow band and broadband absorption in Ag/SiO2/Ag based trilayer thin films by oblique angle deposition of SiO2 layer

“…Most of the optical absorbers are based on the principles of plasmonic resonances, Fabry-Perot cavity resonances, lossy media, metamaterials, and meta-surfaces etc [1][2][3][4]. Absorbers based on surface plasmon resonance are polarization dependent, angle sensitive, and difficult to excite due to requirement of phase matching conditions [5].…”

Three‐dimensional printed fractaldielectric‐resonator‐basedbroadband microwave absorber

“…In addition, fractal loops of any order can be used as FSS to achieve broadband characteristics. 13 Moreover, high loss materials 14 and multilayer construction [15][16][17][18][19] are also used in absorber designs to increase bandwidth, but this results in high cost and volume. In 2008, Landy et al proposed perfect metamaterial absorber (PMA) based on metamaterial.…”