Results 61 to 70 of about 71,675 (317)
Slanted-eye featured forbidden bands in a water channel with undulated sidewalls
Results in Physics, 2021 Resonances induced by structure periodicity can always lead to frequency gaps, which are forbidden bands of propagating waves. Besides the traditional Bragg gaps, non-Bragg gaps have been found in periodic waveguides for years, which have been proved to ...
Bo-Yang Ma +4 more
doaj +1 more source
Bulletin of the South Ural State University. Ser. Computer Technologies, Automatic Control & Radioelectronics, 2016 The dipole antenna providing 13% bandwidth with VSWR lower than 1.15 is considered in the paper. The antenna is characterized by its compactness, mechanical durability, low aerodynamic resistance. The antenna can be executed both in tubular, and in microstrip design. © 2013 EurAAP.
VOYTOVICH N.I., ERSHOV A.V.
openaire +5 more sources
Orbital Geometry‐Governed Response of Pressure‐Tunable Quantum Defects in hBN
Advanced Functional Materials, EarlyView.Defects in hBN act as ultrasensitive quantum manometers when the energy of the intradefect optical transitions is modified by lattice compression. The orbital geometry of the electron wave functions governs how electron hopping and Coulomb interactions react uniquely to the reduction of the van der Waals gap and in‐plane compression, leading to robust ...
Magdalena Grzeszczyk +6 more
wiley +1 more source
Manipulation of double acoustic defect states based on connection phase mismatching
Results in Physics, 2021 Defects in periodic structures always lead to the defect states, which can modulate the physical or chemical properties of materials to realize devices with very high performance.
Huan Liu +4 more
doaj +1 more source
Unraveling the Electronic Structure of Silicon Vacancy Centers in 4H‐SiC
Advanced Functional Materials, EarlyView.The electronic structure of the silicon vacancy in 4H‐SiC is probed via transient absorption spectroscopy, uncovering previously inaccessible excited states of the quartet and doublet spin channels, including the V2' transition. In combination with theoretical analysis, a comprehensive picture of the electronic structure is established.
Ali Tayefeh Younesi +9 more
wiley +1 more source
Temperature tuning of defect state induced by the periodic cavities between the phononic crystals
AIP Advances, 2021 The defect state in periodic structures usually leads to a pass band in the forbidden bandgap and energy localization at the position of geometric change.
Huan Liu +5 more
doaj +1 more source
Chiral Phase Change Nanomaterials
Advanced Functional Materials, EarlyView.This work demonstrates reversible, non‐volatile phase transitions in chiral Ge2${\rm Ge}_2$Sb2${\rm Sb}_2$Te5${\rm Te}_5$ (GST) nanohelices for high‐speed optical modulation of chirality and dynamic control of the state of polarization (SOP). The chiral nanostructures are fabricated using a highly directional, wafer‐scale physical vapor deposition ...
Joshua A. Burrow +11 more
wiley +1 more source
Advanced Functional Materials, EarlyView.A dye‐based photoinitiator acting as a structure‐directing element, guides the formation of a cholesteric polymer network that behaves as a chirped photonic structure with dissipative chiral coupling. Photopolymerization freezes a depth‐dependent helical pitch, broadening the Bragg resonance spectrum.
Alfredo Mazzulla +2 more
wiley +1 more source
Reconfigurable wideband patch antenna for cognitive radio
, 2009 Cognitive radio communication is envisaged to be a new paradigm of methodologies for enhancing the performance of radio communication systems through the efficient utilization of radio spectrum.
AbuTarboush, HF +14 more
core +1 more source
An IR-UWB photonic distribution system [PDF]
, 2008 Experimental results are presented for a novel distribution system for an impulse radio ultra-wideband (UWB) radio signals employing a gain-switched laser.
Barry, Liam P. +7 more
core +1 more source