Results 241 to 250 of about 70,968 (286)

Terahertz Channel Modeling, Estimation and Localization in RIS‐Assisted Systems

Advanced Electronic Materials, EarlyView.
Reconfigurable intelligent surfaces have become a recent intensive research focus. Based on practical applications, channel strategies for RIS‐assisted terahertz wireless communication systems are categorized into three different types: channel modeling, channel estimation, and channel localization.
Hongjing Wang, Weipeng Wang, Xuan Cong, Shiyu Wang, Gao Li, Sen Gong, Lin Huang, Hongxin Zeng, Yaxin Zhang, Ziqiang Yang   +9 more
wiley   +1 more source

Enhanced High Dimensionality and the Information Processing Capacity in Interfered Spin Wave‐Based Reservoir Computing, Achieved With Eight Detectors

Advanced Electronic Materials, EarlyView.
Physical reservoir computing (PRC) based on spin wave interference has demonstrated high computational performance, yet room for improvement remains. In this study, we fabricated this concept PRC with eight detectors and evaluated the impact of the number of detectors using a chaotic time series prediction task.
Sota Hikasa, Wataru Namiki, Daiki Nishioka, Maki Nishimura, Ryo Iguchi, Kazuya Terabe, Takashi Tsuchiya   +6 more
wiley   +1 more source

Recent Advances in Programmable Metasurfaces and Meta‐Devices

Advanced Electronic Materials, EarlyView.
Programmable metasurfaces enable various novel functionalities by dynamically tuning electromagnetic wavefronts. This article provides a comprehensive review of recent advances in microwave and terahertz programmable metasurfaces, covering electrical, thermal, optical, and mechanical control mechanisms.
Linda Shao, Chong He, Nan Wang, Liming Si, Weiren Zhu   +4 more
wiley   +1 more source

Non‐volatile Sliding Ferroelectric Memory Effect in Ultrathin γ‐InSe

Advanced Electronic Materials, EarlyView.
Room‐temperature sliding ferroelectricity in γ‐InSe enables a two‐dimensional FeFET with a 6.8 V memory window, above 104 conductance modulation, longer than 10‐years retention and above 103 cycles fatigue resistance. An ultrathin (4.8 nm) γ‐InSe ferroelectric tunnel junction exhibits reversible high/low resistance switching with TER of 105 at room ...
Yue Li, Luoyang Ding, Zhixiong Li, Feng Chen, Xiaoyao Weng, Min Zhu, Siyuan Wan, Yangbo Zhou   +7 more
wiley   +1 more source

In Situ Measurement of Oxygen Vacancy Dynamics and Surface Exchange Reactions in Oxide Electrode under Solid Electrochemical Cell Operating Conditions

Advanced Energy Materials, EarlyView.
This study establishes an in situ electrochemical framework using dense bulk electrodes to identify defect chemistry and surface kinetics. While oxygen vacancy concentration is derived via bias modulation, surface exchange coefficients are quantified at open circuit voltage conditions to isolate kinetics.
Taeyun Kim, Jinsil Lee, Hee Jung Park, Ji Haeng Yu, José M. Serra, Jong Hoon Joo   +5 more
wiley   +1 more source

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Self-focusing vortex beams

Optics Letters, 2021
A class of wide-stationary optical sources with a specially designed degree of coherence profile is introduced for radiating spectral densities with a vortex whose core’s location and size can be controlled at a specified range. This is achieved by modeling of the source coherence state as a combination of a helicoidal separable phase and a Cartesian ...
Zhangrong Mei, Olga Korotkova, Daomu Zhao, Yonghua Mao   +3 more
openaire   +2 more sources

Engineering synthesized vortex beams

Proceedings of the 2022 Conference on Lasers and Electro-Optics Pacific Rim, 2022
We propose an effective scheme to engineer the light tubes of vortex beams with predetermined geometries and controllable intensity profiles. This is beneficial to a broad range of applications such as particle trapping and micromachining.
Na Xiao, Chen Xie, François Courvoisier, Minglie Hu   +3 more
openaire   +1 more source

Vortex Beam Shaping

SPIE Proceedings, 2006
A novel method for tuning the orbital angular momentum (OAM) content of a vortex beam is presented. This approach makes use of the shaping of the odd and even components of the helical phase profile associated to the vortex. A relative azimuthal shift of the components results in the harmonic variation of the magnitude of the OAM density of the ...
C. López-Mariscal, J. C. Gutiérrez-Vega   +1 more
openaire   +1 more source

Hollow vortex beams

Journal of the Optical Society of America A, 2008
Hollow beam formation of radially and azimuthally polarized vortex beams, which has arbitrary topological charge, is analytically discussed under the strong focusing condition. The expressions for the electric fields of the focused vector-vortex beams are obtained based on a vector diffraction theory.
Shunichi, Sato, Yuichi, Kozawa
openaire   +2 more sources

Atom vortex beams

Physical Review A, 2014
The concept that all de Broglie particles can form vortex beams is analyzed for neutral atoms. It is shown how atoms diffracted from a suitably constructed optical mask configuration employing light of $l$ units of orbital angular momentum and at far-off resonance with an atomic transition can lead to the generation of a discrete set of atom vortex ...
V. E. Lembessis, D. Ellinas, M. Babiker, O. Al-Dossary   +3 more
openaire   +1 more source