Structural radar absorber has important application in stealth field for its ability to effectively absorb incoming wave and bear the load at same time. Metasurface absorbers can achieve nearly-perfect absorption of wave, have characteristics light weight thin structure, but their bandwidth are usually narrow. To solve this problem, a new method broadening metasurface is proposed work. With var...

A frequency magnetically tunable perfect absorber based on graphene in the terahertz (THz) region is proposed. The performance analysed using 4 × transfer matrix method, demonstrating that absorption of proposed for a left-handed circularly polarized (LCP) wave can be dynamically tuned by varying external static bias magnetic field three ranges (0.95–2.2 THz, 4.15–5.4 and 7.3–8.55 THz). Due to ...

Infrared detection technology has important applications in laser ranging, imaging, night vision, and other fields. Furthermore, recent studies have proven that hot carriers which are generated by surface plasmon decay can be exploited for photodetection to get beyond semiconductors’ bandgap restriction. In this study, silicon nanopillars (NPs) gold film at the top bottom of were designed gener...

Abstract We propose a wide-angle metamaterial absorber with more than 90% absorption in the far-infrared (F-IR) and terahertz (THz) regimes. Our metal-dielectric consists of phase change layer (Ge 2 Sb Te 5 ), dielectric spacer (MgF bottom refractory metal (TiN). numerically designed structure by finite-difference time-domain simulation method demonstrated perfect spectral range from 10 μ m to ...

Black phosphorus (BP) as a novel class of two-dimension (2D) materials has recently attracted enormous attention as a result of its unique physical and chemical features. The remarkably strong light-matter interaction and tunable direct band-gap at a wide range make it an ideal candidate especially in the mid-infrared wavelength region as the saturable absorber (SA). In this paper, the simple a...

The phase response of a commercial saturable absorber based on semiconductor quantum wells embedded in a resonant cavity is investigated. The nonlinear absorption change is accompanied by a variation of the spectral phase characteristic. Also, a nonlinear change in the refractive index of the material, induced by the modified carrier density, produces a weak shift in the resonant wavelength of ...

In such a device concept, the effi ciency of thin fi lm solar devices can be enhanced by orthogonalizing the light absorption and carrier collection processes, especially for the material systems that exhibit low minority carrier lifetimes. [ 7 ] In addition, surface refl ectance is reduced and the absorption is enhanced, thus improving the overall conversion effi ciency. One route for fabricat...