In this paper, a three-layered frequency-selective absorber (FSA) that can efficiently absorb electromagnetic waves (EM) in double-band is proposed. The proposed structure designed so signals reflected from the frequency selective ground plane are located at 2.4 and 5.5 GHz (ISM UNII bands) absorbed by front resistive layers. Simulation results show not only blocks transmission desired bands bu...

Perfect metamaterial absorber (PMA) can intercept electromagnetic wave harmful for body in Wi-Fi, cell phones and home appliances that we are daily using and provide stealth function that military fighter, tank and warship can avoid radar detection. We reported new concept of water droplet-based PMA absorbing perfectly electromagnetic wave with water, an eco-friendly material which is very plen...

We present the results of a BeppoSAX observation of the nearby spiral galaxy NGC 4945 in the 0.1–200 keV energy band. The nuclear X-ray emission emerges above '7 keV, through an absorber with column density NH ∼ a few 1024 cm−2. Its remarkable variability (doubling/halving timescale ∼104 s) is not associated with any appreciable spectral changes, ruling out variations of the interposed absorber...

Plasmonics offer an exciting way to mediate the interaction between light and matter, allowing strong field enhancement and confinement, large absorption and scattering at resonance. However, simultaneous realization of ultra-narrow band perfect absorption and electromagnetic field enhancement is challenging due to the intrinsic high optical losses and radiative damping in metals. Here, we prop...

Alloying nickel oxide (NiO) with lithium oxide (Li2O) at high Li concentrations may reduce NiO's band gap and expand its use as a light absorber in photocatalytic and tandem dye-sensitized solar cell technologies. In this work, we evaluate the viability of this alloy as a p-type hole transport material. We use embedded cluster models, along with unrestricted Hartree-Fock and complete active spa...

Light absorption is a fundamental optical process playing significantly important role in wide variety of applications ranging from photovoltaics to photothermal therapy. Semiconductors have well-defined absorption bands with low-energy edge dictated by the band gap energy, therefore it is rather challenging to tune the absorption bandwidth of semiconductors. However, resonant absorbers based o...

Multiband Absorber In article number 2000734 by Guangsheng Deng, Jun Yang, and co-workers, a multiband absorber based on three-dimensional (3D) frequency selective structures (FSSs) is presented. Four standing closed loops intersecting with lateral split loop in each cell, as shown the bottom of picture, generate multi-band perfect electromagnetic wave absorption. The proposed structure, which ...