Results 61 to 70 of about 67,297 (277)

Wakefields in conducting waveguides with a lossy dielectric channel

Physical Review Accelerators and Beams, 2020
The resonant properties of the impedance of a two-layer circular metal-dielectric waveguide are investigated by taking into account the finite conductivity of the metallic pipe and the dissipation of the radiated energy in the dielectric layer.
M. I. Ivanyan, L. V. Aslyan, K. Floettmann, F. Lemery, V. M. Tsakanov   +4 more
doaj   +1 more source

Coupling characteristics between cylindrical hybrid plasmon waveguide and cylindrical silicon nanowire waveguide

AIP Advances, 2021
Cylindrical waveguides have a wide range of applications in photonic integrated circuits because of lower transmission losses. This paper proposes a directional coupler composed of a cylindrical silicon nanowire waveguide and a metal-based cylindrical ...
Jian-Ping Liu, Wei-Lin Wang, Fang Xie, Chen Li, Xia Zhou, Ji-Hai Yu, Si-Qi Li, Ling-Ling Wang   +7 more
doaj   +1 more source

Design of 2D TeraHertz band-gap photonic waveguides using an accelerated integral equation technique [PDF]

, 2009
This paper describes the application of the buffered block forward backward (BBFB) method to the problem of modeling 2D terahertz (THz) photonic band gap waveguides at the frequency of 3 THz.
Bogusevschi, Diana, Brennan, Conor, Degirmenci, Elif, Landais, Pascal   +3 more
core   +1 more source

Ultrathin, Stretchable, and 3D‐Printable Complementary Nanotubes–Polymer Composites for Multimodal Radiation Shielding in Extreme Environments

Advanced Materials, EarlyView.
A 3D‐printable dual‐mode radiation shielding material is introduced by combining boron nitride nanotubes and single‐walled carbon nanotubes in a stretchable PDMS matrix. The complementary nanotube network enables simultaneous attenuation of electromagnetic interference and neutron radiation while maintaining lightweight, mechanical resilience, and ...
Flandy, Kun Kim, Jaehyoung Ko, Daeun Kim, Daekwon Lee, Heesuk Rho, Sang Seok Lee, Dong Su Lee, Se Gyu Jang, Seokhoon Ahn, Seung‐Yeol Jeon, Dae‐Young Jeon, Yongho Joo   +12 more
wiley   +1 more source

PTFE-Based Circular Terahertz Dielectric Waveguides

Photonics
This paper presents the transmission characteristics of flexible solid circular dielectric waveguides in the terahertz frequency band. In this paper, we measured the electrical properties of certain polymers within 325–500 GHz.
Hao Li, Dehai Zhang, Haotian Zhu
doaj   +1 more source

MEASUREMENT OF FOAM PLASTICS PERMITTIVITY WITH THE RESONANCE METHOD USING A WAVEGUIDE-DIELECTRIC RESONATOR [PDF]

Радиофизика и электроника, 2016
The rapid development of electronic technology is characterized by continuous expanding the potentials of new types of created elements, devices and systems that use porous plastics.
R. I. Bilous, M. V. Vovnyuk, I. G. Skuratovskiy, O. I. Khazov, A. S. Shakhova   +4 more
doaj   +1 more source

Metamaterial Antennas Enhance MRI of the Eye and Occipital Brain

Advanced Materials, EarlyView.
A radiofrequency antenna platform comprising planar and bend configurations is developed, incorporating structurally integrated epsilon‐negative metamaterial unit cells to enhance MRI. These antennas enable high‐resolution in vivo human MRI of the eye, orbit, and occipital brain. Comprehensive validation, including simulations, phantom experiments, SAR,
Nandita Saha, Bilguun Nurzed, Mostafa Berangi, Andre Kuehne, Helmar Waiczies, Igor Fabian Tellez Ceja, Xiang Hu, Thomas Gladytz, Lisa Krenz, Dave Huebler, Beate Endemann, Claudia Brockmann, Ebba Beller, Oliver Stachs, Thoralf Niendorf   +14 more
wiley   +1 more source

Extension of an FFT-Based Beam Propagation Method to Plasmonic and Dielectric Waveguide Discontinuities and Junctions

Applied Sciences, 2019
We adapted a fast Fourier transform-based Beam Propagation Method (FFT-BPM) to investigate waveguide discontinuities in plasmonic waveguides. The adaptation of the FFT-BPM to treat transverse magnetic (TM) fields requires the circumvention of two major ...
Adel Shaaban, Yi-Chun Du, Lotfy Rabeh Gomaa   +2 more
doaj   +1 more source

Role of the Recombination Zone in Organic Light‐Emitting Devices

Advanced Materials, EarlyView.
This review summarizes the critical role of the recombination zone in organic light‐emitting diodes (OLEDs). We highlight that broadening the recombination zone in OLEDs based on emissive layers with balanced charge transport and high photoluminescence quantum yields provides a promising route toward achieving both long operational lifetime and high ...
Yungui Li, Karl Leo
wiley   +1 more source

Line Defect-Layered EBG Waveguides in Dielectric Substrates

International Journal of Antennas and Propagation, 2018
A dielectric-based multilayer structure composed of U-shaped rings (ML-UR) is used to develop a class of novel electromagnetic band gap (EBG) slab waveguide. The structure has two band gaps that narrow down as dielectric constant is increased.
Hassna Ouassal, Jafar Shaker, Langis Roy, Khelifa Hettak, Reza Chaharmir   +4 more
doaj   +1 more source