Results 1 to 10 of about 38,934 (253)

2D Ray Tracing Analysis of a Dynamic Metasurface Antenna as a Smart Motion Detector

IEEE Access, 2019
We present a ray-tracing analysis of a smart motion detector based on a dynamically reconfigurable metasurface antenna (DMA). A DMA consists of an array of metamaterial radiators excited by a single-port waveguide or cavity.
Oren S. Mizrahi, Mohammadreza F. Imani, K. Parker Trofatter, Jonah N. Gollub, David R. Smith   +4 more
doaj   +1 more source

Detecting Motion in a Room Using a Dynamic Metasurface Antenna

IEEE Access, 2020
Sensing motion and distinguishing its source as human or nonhuman, with high precision, has tremendous applications in a variety of areas from health monitoring to energy efficiency.
Alexander X. Oesterling, Mohammadreza F. Imani, Oren S. Mizrahi, Jonah N. Gollub, David R. Smith   +4 more
doaj   +1 more source

Pomb@Co3O4-based composites for ultra-wideband microwave absorption: A multi-scale perspective from micro-, meso- and meta-structure

Materials & Design
Microwave absorbing materials (MAMs) are used to prevent electromagnetic pollution and enhance equipment stealth. However, their limited absorption intensity and narrow effective bandwidth restrict their applicability.
Guodong Han, Yudeng Wang, Zhaotang Liu, Song Zhao, Junxiang Zhou, Bo Feng, Sai Sui, Xiaoxia Tian, Jun Wang, 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

Second harmonic generation in amorphous silicon-on-silica metamaterial

APL Photonics, 2021
We demonstrate second harmonic generation by using an amorphous silicon metamaterial fabricated on the tip of an optical fiber that collects the generated light.
Jie Xu, Eric Plum, Vassili Savinov, Nikolay I. Zheludev   +3 more
doaj   +1 more source

Microwatt Volatile Optical Bistability via Nanomechanical Nonlinearity

Advanced Science, 2023
Metastable optically controlled devices (optical flip‐flops) are needed in data storage, signal processing, and displays. Although nonvolatile memory relying on phase transitions in chalcogenide glasses has been widely used for optical data storage ...
Dimitrios Papas, Jun‐Yu Ou, Eric Plum, Nikolay I. Zheludev   +3 more
doaj   +1 more source

Unlabeled Far‐Field Deeply Subwavelength Topological Microscopy (DSTM)

Advanced Science, 2021
A nonintrusive far‐field optical microscopy resolving structures at the nanometer scale would revolutionize biomedicine and nanotechnology but is not yet available.
Tanchao Pu, Jun‐Yu Ou, Vassili Savinov, Guanghui Yuan, Nikitas Papasimakis, Nikolay I. Zheludev   +5 more
doaj   +1 more source

Stimulator-multiplexing framework of microwave-infrared compatible reconfigurable metasurface integrated with LED array

Nanophotonics
Metasurface can accurately control and manipulate electromagnetic (EM) waves with high degree of freedom, which is mainly due to their subwavelength structures and functional arrangements.
Li Yuxi, Zhu Ruichao, Sui Sai, Cui Yina, Jia Yuxiang, Han Yajuan, Fu Xinmin, Feng Cunqian, Qu Shaobo, Wang Jiafu   +9 more
doaj   +1 more source

Software Calibration of a Frequency-Diverse, Multistatic, Computational Imaging System

IEEE Access, 2016
We demonstrate a technique for calibrating a frequency-diverse, multistatic, computational imaging system. A frequency-diverse aperture enables an image to be reconstructed primarily from a set of scattered field measurements taken over a band of ...
Okan Yurduseven, Jonah N. Gollub, Kenneth P. Trofatter, Daniel L. Marks, Alec Rose, David R. Smith   +5 more
doaj   +1 more source

Auxetic Systems Fabricated Using Mycelia-Based Composites

Journal of Manufacturing and Materials Processing
In an era of increasingly problematic global waste management, innovative materials can hold the key to a circular economy. Within such a context, this work aimed at manufacturing, potentially for the first time, auxetic material (i.e., materials with a ...
Claudia Cadinu, Ruben Gatt, Renald Blundell, Joseph N. Grima, Pierre-Sandre Farrugia   +4 more
doaj   +1 more source