Results 31 to 40 of about 1,349 (239)

Active steering of cathodoluminescence through a generalized Smith–Purcell effect [PDF]

Light: Science & Applications
Optical metasurfaces can shape the near fields of energetic electrons, enabling Smith–Purcell (SP) emission. We introduce a generalized SP effect relying on finite periodic arrays whose elements possess individually tunable polarizabilities, allowing us ...
Eduardo J. C. Dias, A. Rodríguez Echarri, Theis P. Rasmussen, F. Javier García de Abajo, Joel D. Cox   +4 more
doaj   +2 more sources

Programmable Acoustic Metasurfaces [PDF]

Advanced Functional Materials, 2019
AbstractMetasurfaces open up unprecedented potential for wave engineering using subwavelength sheets. However, a severe limitation of current acoustic metasurfaces is their poor reconfigurability to achieve distinct functions on demand. Here a programmable acoustic metasurface that contains an array of tunable subwavelength unit cells to break the ...
Zhenhua Tian, Chen Shen, Junfei Li, Eric Reit, Yuyang Gu, Hai Fu, Steven A. Cummer, Tony Jun Huang   +7 more
openaire   +3 more sources

Metasurface‐Programmable Wireless Network‐On‐Chip

Advanced Science, 2022
AbstractThis paper introduces the concept of smart radio environments, currently intensely studied for wireless communication in metasurface‐programmable meter‐scaled environments (e.g., inside rooms), on the chip scale. Wireless networks‐on‐chips (WNoCs) are a candidate technology to improve inter‐core communication on chips but current proposals are ...
Imani, Mohammadreza, Abadal Cavallé, Sergi, Del Hougne, Philipp   +2 more
openaire   +6 more sources

An Optically-Programmable Absorbing Metasurface [PDF]

2018 IEEE International Symposium on Circuits and Systems (ISCAS), 2018
A tunable metasurface absorber is presented in this work using an optically-programmable capacitor as the tuning element. The tuning element does not employ conventional semiconductor technologies to operate but rather a bases its tuning by changing the optomechanical properties of its dielectric, poly disperse red 1 acrylate (PDR1A).
Kossifos, K. M., Antoniades, Marco A., Georgiou, Julius, Jaafar, A. H., Kemp, N. T., Kossifos, K. M., Antoniades, Marco A., Georgiou, Julius, Jaafar, A. H., Kemp, N. T.   +9 more
openaire   +4 more sources

Programmable diffractive deep neural networks enabled by integrated rewritable metasurfaces. [PDF]

Sci Rep
Photonic neural networks capable of rapid programming are indispensable to realize many functionalities. Phase change technology can provide nonvolatile programmability in photonic neural networks.
Zarei S.
europepmc   +2 more sources

Programmable Metasurface Antenna for Electromagnetic Torso Scanning [PDF]

IEEE Access, 2020
A wideband beam-switching metasurface antenna using programmable unit-cells is proposed for electromagnetic torso scanning. The design aims at changing the intensity of the electric field inside the torso without any mechanical movements and thus enables fast electronic scanning of the torso.
Amin Darvazehban, Sasan Ahdi Rezaeieh, Amin M. Abbosh   +2 more
openaire   +5 more sources

Dynamic Programmable Wireless Environment with UAV-mounted Static Metasurfaces [PDF]

, 2022
Reconfigurable intelligent surfaces (RISs) are artificial planar structures able to offer a unique way of manipulating propagated wireless signals. Commonly composed of a number of reconfigurable passive cell components and basic electronic circuits ...
Tyrovolas, Dimitrios, Karagiannidis, George K., Liaskos, Christos, Papadopoulos, Alexandros, Ioannidis, Sotiris, Diamantoulakis, Panagiotis, Kantartzis, Nikolaos, Tegos, Sotiris, Pitilakis, Alexandros, Tsiolaridou, Ageliki, Mekikis, Prodromos-Vasileios   +10 more
core   +4 more sources

Design of a Wide-Angle and Polarization-Free 1-Bit Programmable Metasurface

Frontiers in Materials, 2022
Programmable metasurfaces have the powerful capability of controlling electromagnetic (EM) waves by coding the digital state of each meta-atom. However, conventional programmable metasurface units are difficult to maintain stable controllability under ...
Lu Liu, Yi Fei Huang, Hao Chi Zhang
doaj   +1 more source

Transistor-loaded nonmagnetic nonreciprocal metasurfaces [PDF]

, 2021
Reciprocal metasurfaces represent prominent compact structures for bidirectional and frequency-invariant transformation of electromagnetic waves. However, their application to modern wireless communication are limited due to their reciprocal response and
Taravati, Sajjad, Eleftheriades, George V.   +1 more
core   +1 more source

Highly integrated programmable metasurface for multifunctions in reflections and transmissions

APL Materials, 2022
Programmable manipulations on both reflections and transmissions usually require multi-layer metasurfaces, numerous active components, and control circuits, leading to a larger profile, complicated bias circuit design, and higher cost.
Qian Ma, Qiao Ru Hong, Xinxin Gao, Qiang Xiao, Lei Chen, Tie Jun Cui   +5 more
doaj   +1 more source