Results 31 to 40 of about 27,248 (265)
An ultra-broadband flexible polarization-insensitive microwave metamaterial absorber
Materials Research Express, 2022 In this paper, an ultra-broadband flexible polarization-insensitive microwave metamaterial absorber is proposed, characterized, and fabricated. To achieve high broadband absorption, a two-layer periodic indium-tin-oxide (ITO) patches array printed on ...
Huihui Jing +6 more
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Crystals, 2020 We present a design of an ultra-broadband metamaterial absorber in the visible and near- infrared regions. The unit cell structure consists of a single layer of metallic truncated-pyramid resonator-dielectric-metal configuration, which results in a high ...
Phuc Toan Dang +8 more
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Micromachines, 2023 We propose a functionally tunable terahertz (THz) metamaterial absorber, which has the switching performance between broadband-narrowband and dual-broadband near-perfect absorption due to the phase transition of Vanadium dioxide (VO2) and the tunable ...
Jing Li +6 more
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Deciphering the broadband absorption of eumelanin in solution
, 2022 Abstract Melanin, a bio-polymer responsible for visible pigmentation in the human body, works as a protective layer in our skin by absorbing UV radiation and efficiently dissipating it into heat, preventing DNA damage. The primary structure of eumelanin, one of the two main forms of melanin, is presumed to be a co-polymer of 5,6-dihydroxyindole
Ekaterina I Izgorodina +3 more
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Materials & DesignThe development of sound-absorbing metamaterials/metastructures provides a new way to solve the problem of low-frequency and broadband sound absorption.
Dazuo Wang +4 more
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A New Broadband and Strong Absorption Performance FeCO3/RGO Microwave Absorption Nanocomposites [PDF]
Materials, 2019 A novel composite of FeCO3 nanoparticles, which are wrapped with reduced graphene oxide (RGO), is fabricated using a facile one-spot solvothermal method. The composite consists of a substrate of RGO and FeCO3 nanoparticles that are embedded in the RGO layers. The experimental results for the FeCO3/RGO composite reveal a minimum refection loss (−44.5 dB)
Huang, Wei +6 more
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Broadband nonreciprocal thermal emissivity and absorptivity
Light: Science & ApplicationsAbstractA body that violates Kirchhoff’s law of thermal radiation exhibits an inequality in its spectral directional absorptivity and emissivity. Achieving such an inequality is of fundamental interest as well as a prerequisite for achieving thermodynamic limits in photonic energy conversion1 and radiative cooling2.
Komron J. Shayegan +4 more
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Advanced Engineering Materials, EarlyView.This article presents the design, modeling, and characterization of air‐pressure–actuated programmable vibroacoustic metamaterials (PVAMM). The study focuses on leveraging air pressure to dynamically tune resonance frequencies for effective noise attenuation.
William Kaal +2 more
wiley +1 more source
Wide-band and narrow-band switchable terahertz absorber based on graphene
Results in Physics, 2023 A three-layer terahertz dual-function absorber with broadband absorption and narrowband absorption switching is proposed based on the special electrically tunable non-equilibrium optical response of graphene.
Yu-Yao Cheng +7 more
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General approach to perfect and broadband absorption in thin films [PDF]
Optics ExpressAbsorption of light in thin films is normally probabilistic. Here, we show that a film of any lossy material, with appropriate thickness, can achieve perfect absorption at any chosen wavelength. We derive the dispersion required to maintain perfect absorption across all wavelengths, show that real materials come close and demonstrate that even non ...
Baurzhan Salimzhanov, Eric Plum
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