Ultra-broadband metamaterial absorber based on all-metal nanostructures

Abstract

In this paper, we propose an ultra-broadband metamaterial absorber based on the connected cylindrical holes (CCHs). The designed structure can achieve more than 90% absorptivity under normal incidence, ranging from ultraviolet to near-infrared (i.e. from 300 nm to 1260 nm), and the peak absorption is up to 99.73%. The excitation of surface plasmon resonance combined with air-slots modes leads to this broadband absorption. For both the TE and TM polarizations, the polarization insensitivity and angle insensitivity are discussed. In order to clearly figure out the physical absorption mechanism, the distribution of electric and magnetic fields is analyzed. In addition, we also demonstrate that the nanostructures absorption performance can be turned by structural parameters. This ultra-broadband metamaterial absorber has application prospects in solar cells, infrared detection and conversion of photovolatics.

Visible to near-infrared polarization-independent large-incidence-angle ultra-broadband absorber

“…It solves Maxwell's equations, ensuring the dependability and precision of numerical results for numerous studies. After the FDTD method to compute the absorption spectra and optimize the structure's parameters in this study [24][25][26][27][28][29].…”

Broadband near unity absorption meta-structure for solar thermophotovoltaic systems and optical window applications

“…Although the proposed absorber achieves an average absorption of 94% over the wavelength range of 500 to 1800 nm, its absorption properties are lower in the visible spectrum, which contains 44.7% visible waves. Qi et al 45 proposed a three-layered meta-structure unit cell with an interconnected cylindrical hole (CCH) shaped resonator layer, which achieved 90% average absorption with normal incidence from UV to near-infrared (300 nm to 1260 nm) and 99.73% maximum absorption. Yu et al 46 suggested a three-layered meta-structure (W–SiO 2 –Au) unit cell with a window-shaped resonator that absorbed 90% of the light from 166.8 to 1926.6 nm.…”

Polarization and angular insensitive bendable metamaterial absorber for UV to NIR range

“…An ultra-wideband MMA with a nanodisk shaped resonator made of Ti gave a mean absorption of 94% in the visible and near-infrared range 33 . In the absorption band of 960 nm from visible to near-infrared, a single-layer MMA presented an average absorption of more than 90% 34 . A four-layer ultra-broadband Ti resonator-based solar radiation absorber working in the UV to NIR range demonstrated an average absorption of 92.7% 35 .…”