Results 51 to 60 of about 75,153 (270)

Metamaterials for Ballistic Electrons [PDF]

, 2007
The paper presents a metamaterial for ballistic electrons, which consists of a quantum barrier formed in a semiconductor with negative effective electron mass.
D. Dragoman, Dragoman M., M. Dragoman
core   +2 more sources

Separable metamaterials: analytical ab-initio homogenization and chirality

, 2016
We investigate the ab-initio homogenization of separable metamaterials with factorized dielectric permittivity profile which can be achieved through suitable grey-scale permittivity design techniques.
Ciattoni, Alessandro, Rago, Domenico, Rizza, Carlo   +2 more
core   +1 more source

Four definitions of magnetic permeability for periodic metamaterials [PDF]

, 2019
We state and compare four different definitions of magnetic permeability for periodic, artificial media, or metamaterials. The connection between them, and properties in general, are discussed in detail, including causality, passivity, symmetry ...
Dirdal, Christopher A., Hågenvik, Hans Olaf, Skaar, Johannes   +2 more
core   +3 more sources

Long-metallic-strip array with parasitic rings: an efficient metasurface for dual-broadband electromagnetic window at large angles

Nanophotonics
The long-metallic-strip (LMS) array proposed by J. B. Pendry has been widely studied in electromagnetic windows. However, it could only work for the single-band window, not the dual-band one, due to the plasma-like oscillation attenuating with increasing
Li Tiefu, Chen Jinwei, Jia Yuxiang, Fu Xinmin, Han Yajuan, Yang Jie, Liu Zhaotang, Ding Chang, Feng Cunqian, Wang Jiafu   +9 more
doaj   +1 more source

Terahertz metamaterials on free-standing highly-flexible polyimide substrates

, 2008
We have fabricated resonant terahertz metamaterials on free standing polyimide substrates. The low-loss polyimide substrates can be as thin as 5.5 micron yielding robust large-area metamaterials which are easily wrapped into cylinders with a radius of a ...
A C Strikwerda, C M Bingham, Hu Tao, K Fan, R D Averitt, W J Padilla, Williams G P, Xin Zhang, Zhang X-C   +8 more
core   +1 more source

What Do Large Language Models Know About Materials?

Advanced Engineering Materials, EarlyView.
If large language models (LLMs) are to be used inside the material discovery and engineering process, they must be benchmarked for the accurateness of intrinsic material knowledge. The current work introduces 1) a reasoning process through the processing–structure–property–performance chain and 2) a tool for benchmarking knowledge of LLMs concerning ...
Adrian Ehrenhofer, Thomas Wallmersperger, Gianaurelio Cuniberti   +2 more
wiley   +1 more source

A New Type Microwave Absorption Materials: Metal–Organic‐Frameworks (MOFs) Used as Non‐Conductive Material Combination with P‐C‐800

Advanced Electronic Materials
Metal–Organic‐Frameworks (MOFs) are commonly used as microwave‐absorbing materials after pyrolysis treatment. Rare researchers treat MOFs as non‐conductive materials and use them as absorbing materials directly.
Guodong Han, Song Zhao, Sai Sui, Bo Feng, Yudeng Wang, Junxiang Zhou, Zhuolun Li, Xiaoxia Tian, Yuxiang Jia, Jiafu Wang, Shaobo Qu   +10 more
doaj   +1 more source

Time-varying optical vortices enabled by time-modulated metasurfaces

Nanophotonics, 2020
In this paper, generation of optical vortices with time-varying orbital angular momentum (OAM) and topological charge is theoretically demonstrated based on time-modulated metasurfaces with a linearly azimuthal frequency gradient.
Barati Sedeh Hooman, Salary Mohammad Mahdi, Mosallaei Hossein   +2 more
doaj   +1 more source

Nonlinear terahertz devices utilizing semiconducting plasmonic metamaterials

, 2015
The development of responsive metamaterials has enabled the realization of compact tunable photonic devices capable of manipulating the amplitude, polarization, wave vector, and frequency of light. Integration of semiconductors into the active regions of
Averitt, Richard D., Bank, Seth R., Fan, Kebin, Keiser, George R., Maddox, Scott J., Seren, Huseyin R., Zhang, Jingdi, Zhang, Xin, Zhao, Xiaoguang   +8 more
core   +1 more source

Quantum levitation by left-handed metamaterials [PDF]

, 2007
Left-handed metamaterials make perfect lenses that image classical electromagnetic fields with significantly higher resolution than the diffraction limit. Here we consider the quantum physics of such devices.
Casimir H B G, Grigorenko A N, Henkel C, Jackson J D, Knöll L, Lamoreaux S K, Landau L D, Landau L D, Landau L D, Leonhardt U, Leonhardt U, Leonhardt U, Leonhardt U, Luks A, Milonni P W, Milonni P W, Prudnikov A P, Rodriguez A, Thomas G Philbin, Ulf Leonhardt, Veselago V   +20 more
core   +6 more sources