Results 71 to 80 of about 1,192 (198)
Terahertz wavefront engineering using a hard-coded metasurface
Optical and Quantum Electronics, 2023 During the past few years, coding metamaterials (MM) drew significant attention, where the far-field scattering/transmission pattern of the electromagnetic wave (particularly in the THz regime) can be encoded into a single or few-bit digitized phase-response of the metasurface, thereby enabling a full digital control.
Noori, Aileen +6 more
openaire +2 more sources
Advanced Science, EarlyView.Photonic time crystals (PTCs) are systems in which electromagnetic parameters are modulated periodically in time, producing momentum bandgaps via temporal scattering rather than spatial Bragg processes. This review examines the theoretical frameworks, modeling, and computational tools for time‐varying media, and summarizes experimental demonstrations ...
Ranjan Kumar Patel +3 more
wiley +1 more source
Reconfigurable phase-modulated metasurfaces via rotating adjustable resistor
Results in Physics, 2023 Reconfigurable metasurfaces have enriched metasurface design with a wide range of application prospects. However, traditional reconfigurable phase-modulated metasurfaces primarily rely on active devices such as diodes to change the resonant response ...
Yuxi Li +9 more
doaj +1 more source
Advanced Science, EarlyView.A programmable 2048‐element circular ultrasound array combined with a compact acoustic lens produces a thin “sound sheet” over a large field of view, and records echoes with wide angular diversity across the ring aperture. Coherence‐enhanced beamforming converts full‐matrix data into high‐contrast tomographic slices, delivering near‐diffraction‐limited
Qiu‐De Zhang +11 more
wiley +1 more source
A Smart Metasurface for Electromagnetic Manipulation Based on Speech Recognition
Engineering, 2023 In this work, we propose and realize a smart metasurface for programming electromagnetic (EM) manipulations based on human speech recognition. The smart metasurface platform is composed of a digital coding metasurface, a speech-recognition module, a ...
Lin Bai +7 more
doaj +1 more source
Study of Free‐Space Optical Quantum Network: Review and Prospectives
Advanced Science, EarlyView.Free from the constraints of fiber connections, free‐space quantum network enables longer and more flexible quantum network connections. This review summarizes and comparatively analyzes free‐space quantum network experiments based on ground stations, satellites, and mobile platforms.
Hua‐Ying Liu, Zhenda Xie, Shining Zhu
wiley +1 more source
Helicity-switched hologram utilizing a polarization-free multi-bit coding metasurface
, 2020 International audienceIn this work, a polarization-free coding metasurface is proposed to manipulate circularly polarized waves. Compared to a Pancharatnam-Berry phase metasurface, the proposed design not only allows for overcoming anti-symmetrical ...
Jin, Ming +6 more
core +1 more source
Advanced Science, EarlyView.A nano‐plasma device enables watt‐level on‐chip THz generation through picosecond switching triggered by secondary electron emission avalanche. An ultra‐dense electron sheet initiates nano‐plasma formation within a ∼100 nm gap, driving rapid energy release into an integrated resonator.
Guangyu Sun +4 more
wiley +1 more source
Coding metasurface to reduce RCS
, 2020 Reducing RCS is mainly relevant many militaries in the world as they seek to improve their stealth technology. There have been many methods that are created to reduce RCS, however these various methods have their limitations.
Ho, Desmond Zheng Nam
core +1 more source
Intelligent metasurface with frequency recognition for adaptive manipulation of electromagnetic wave
Nanophotonics, 2022 Due to the strong ability of recognizing electromagnetic (EM) environment and adaptively control of EM waves, the intelligent metasurfaces have received great attention recently.
Wang Hai Peng +10 more
doaj +1 more source