Brewster's angle

Nanoparticle

Fresnel equations

Materials science

Refractive index

Infrared

Layer (electronics)

Particle physics

Brewster

Absorption (acoustics)

Metamaterial

Surface plasmon

Wavelength

Magnesium fluoride

Surface plasmon resonance

Tunable metamaterials

Physical chemistry

Polarization (electrochemistry)

Physics

Wideband

Nanotechnology

Metamaterial absorber

Optics

Resonance (particle physics)

Molar absorptivity

Composite material

Plasmon

Chemistry

Optoelectronics

Optics Express

In this study, we designed a novel ultra-wideband (UWB) absorber and numerically analyzed it to demonstrate that its light absorptivity was greater than 90% in the wavelength range of visible light and near-infrared (405-1505 nm). The structure of proposed novel UWB absorber consisted of four layers of films, including silica, titanium, magnesium fluoride, and aluminium, and the upper silica and titanium layers had rectangular cubes in them. For that, the excitations of propagating surface plasmon resonance (PSPR), local surface plasmon resonance (LSPR), and the resonance of Fabry-Perot (FP) cavity were generated at the same time and combined to reach the effect of perfect absorption and ultra-wideband. The proposed absorber had an average absorptivity of 95.14% in the wavelength range of 405 ∼ 1505 nm when the light was under normal incidence. In addition, the UWB absorber was large incident angle insensitive and polarization-independent. The absorber proposed in the paper had great prospects in the fields of thermal electronic equipment, solar power generation, and perfect cloaking.

Numerical analysis of an ultra-wideband metamaterial absorber with high absorptivity from visible light to near-infrared