Results 101 to 110 of about 27,230 (299)

Metasurface-Enabled Antiparallel Dual-Beam Rectangular-Waveguide Antenna

, 2020
We propose a metasurface structure integrated at the aperture of a flanged rectangular waveguide to produce dual-beam radiation. The dual beams are anti-parallel in an orientation and perpendicular to the boresight direction. The metasurface is backed by
Wayne Rowe (18031822), Md. Rokunuzzaman Robel (20051391), Asif Ahmed (20064312)   +2 more
core  

Liquid‐Crystal‐Based Reconfigurable Intelligent Surface for 7 GHz Mobile Communication

Advanced Materials Technologies, EarlyView.
The glass‐based liquid‐crystal reconfigurable intelligent surface (LC‐RIS) integrates active‐matrix driving and blind‐greedy phase optimization within a 5G‐NR OFDM framework. This enables continuously tunable and autonomous enhancement of wireless coverage. Leveraging the transparency and manufacturability of liquid crystal panels, it is ideally suited
Tien‐Lun Ting, Yuh‐Chyi Chang, Yi‐Chan Hung, Cheng‐Yuan Hsiao, Chao‐Kai Wen, Tsung‐Hsien Lin   +5 more
wiley   +1 more source

Metasurfaced Reverberation Chamber

Scientific Reports, 2018
The concept of metasurfaced reverberation chamber (RC) is introduced in this paper. It is shown that by coating the chamber wall with a rotating 1-bit random coding metasurface, it is possible to enlarge the test zone of the RC while maintaining the ...
Hengyi Sun, Zhuo Li, Changqing Gu, Qian Xu, Xinlei Chen, Yunhe Sun, Shengchen Lu, Ferran Martin   +7 more
doaj   +1 more source

Photoluminescence Reshaping via Structural Confinement and Local Density of Optical States Control in Ir(III)‐Doped Biodegradable Metasurfaces

Advanced Materials Technologies, EarlyView.
Phosphorescent biodegradable metasurface showing vibronic selection and spectral photoluminescence narrowing. Anti‐correlation between experimental LDOS and measured lifetimes. ABSTRACT Metasurfaces incorporating phosphorescent emitters offer a route to engineer radiative and vibronic processes beyond chemical design.
Vincenzo Caligiuri, Andrea Smeriglio, Svetlana Siprova, Olga Favale, Francesca Leone, Roberto Termine, Debora Policastro, Alessandra Crispini, Attilio Golemme, Nicolas Godbert, Iolinda Aiello, Antonio De Luca   +11 more
wiley   +1 more source

Luminescent hyperbolic metasurfaces [PDF]

Nature Communications, 2017
AbstractWhen engineered on scales much smaller than the operating wavelength, metal-semiconductor nanostructures exhibit properties unobtainable in nature. Namely, a uniaxial optical metamaterial described by a hyperbolic dispersion relation can simultaneously behave as a reflective metal and an absorptive or emissive semiconductor for electromagnetic ...
Smalley, JST, Vallini, F, Montoya, SA, Ferrari, L, Shahin, S, Riley, CT, Kanté, B, Fullerton, EE, Liu, Z, Fainman, Y   +9 more
openaire   +5 more sources

Metasurface-based planar microlenses for SPAD pixels

In this paper we present two design generations of metasurface-based planar microlenses implemented on Front-Side Illumination SPAD pixels. This kind of microlens is an alternative to conventional reflow microlens.
Jérôme Vaillant (18237763), Alain Ostrovsky (18237769), Lilian Masarotto (18237775), Lucie Dilhan (18237766), Mickaël Cavelier (18237781), Romain Paquet (18237778), Quentin Abadie (18237772), Cyril Bellegarde (18237784)   +7 more
core   +1 more source

Polaritonic Materials: A Comparative Study on the Relaxation Kinetics in Fabry–Perot versus Plasmonic Cavities

Advanced Optical Materials, EarlyView.
Comparing Fabry–Perot and plasmonic nanorod cavities reveals how the number of dark states dictates polariton relaxation. The high number of dark states results in a polaritonic bottleneck, while reducing the number of dark states enables to measure the polaritonic decay.
Nicola Peruffo, Jack M. Woolley, Rahul Bhuyan, Raj Pandya, James Lloyd‐Hughes, Karl Börjesson   +5 more
wiley   +1 more source

Reconfigurable metasurface based on graphene optical antennas for dynamic beam steering

Sustainable Engineering and Innovation
Metasurface represents a transformative advancement in photonics due to its exotic abilities to control electromagnetic wave properties.
Zahraa J. Abdulkareem, Tagreed K. Hamad, Taha A. Elwi   +2 more
doaj   +1 more source

Two‐Dimensional Isotropic Spatial Differentiation Through Complete Polarization Control

Advanced Optical Materials, EarlyView.
This work enables two‐dimensional isotropic spatial differentiation at planar interfaces over a wide range of incident angles by extending the output polarization from linear to elliptical. The choice of incident angle can be used to balance broader spectral response at low angles and higher edge‐detection efficiency at larger angles.
Doyoon Lee, Minkyung Kim
wiley   +1 more source

Theoretical study on dynamical planar-chirality switching in checkerboard-like metasurfaces

EPJ Applied Metamaterials, 2017
In this paper, we show that the handedness of a planar chiral checkerboard-like metasurface can be dynamically switched by modulating the local sheet impedance of the metasurface structure.
Urade Yoshiro, Nakata Yosuke, Nakanishi Toshihiro, Kitano Masao   +3 more
doaj   +1 more source