scholarly journals High-Performance Radiation Design of a Planar Bow-tie Antenna Combined with a Dielectric Lens and Cascaded Matching Layers at Terahertz Frequency

2018 ◽  
Vol 9 (3) ◽  
pp. 589 ◽  
Author(s):  
Catur Apriono ◽  
Arie Pangesti Aji ◽  
Teguh Wahyudi ◽  
Fitri Zulkifli ◽  
Eko Tjipto Rahardjo
Keyword(s):  
High Performance ◽  
Terahertz Frequency ◽  
Dielectric Lens ◽  
Bow Tie

Printed Electrode for High-Performance Bow-Tie Antenna by Photonic Sintering Process

2021 ◽  
Vol 21 (12) ◽  
pp. 5881-5889
Author(s):  
Hyun Jin Nam ◽  
Ji-Hun Yuk ◽  
Kyu Song ◽  
Young Sun Kim ◽  
Su-Yong Nam ◽  
...  
Keyword(s):  
Human Body ◽  
High Performance ◽  
High Efficiency ◽  
Electronic Device ◽  
Flexible Electronic Device ◽  
Ag Particles ◽  
Conductive Fillers ◽  
Electrode Characteristics ◽  
Photonic Sintering ◽  
Bow Tie

Recently, flexible electronic device technology has evolved beyond curved devices with the development of flexible/stretchable devices that can be crumpled or stretched. Both elasticity and durability are essential for these devices, which should have high-conductivity for antennas and repeatability for sensors. In addition, electronic-skins, which can have a direct impact on the human-body, should be harmless to the human-body and should not be deformed by contact with sweat or organic matter. In this study, PDMS substrates were used to satisfy the above conditions. PDMS is used to fabricate human-friendly, flexible/stretchable substrates, and it has excellent repeat durability characteristics. To improve the adhesion of these PDMS films and electrodes, conductive paste was produced based on PDMS resins of the same properties. In addition, two types of Ag particles were selected as conductive fillers because the electrode characteristics of the antenna application requires excellent conductivity, and conductive paste were produced using flake Ag, which could affect conductivity, and Ag nanoparticles that affect stretchability and repeatability. The paste was applied using a high-efficiency printing technique. The printed electrodes were cured in a thermal oven. For higher conductivity, photonic-sintering was carried out during post-processing. As a result, 1.1117×106 (S/m) had excellent conductivity, performed well in repeated tensile-durability experiments of 30% to 100 times, and produced a bow-tie antenna for the above electrodes. As a result of tensing up to 35% through a Network-Analyzer, there was no performance change in the resonance-frequency or return-loss values, and excellent electrodes were developed that would achieve excellent performance even if they are applied in the sub-frequency area of 5G-antennas in the future.

scholarly journals The MBE growth and optimization of high performance terahertz frequency quantum cascade lasers

2015 ◽  
Vol 23 (3) ◽  
pp. 2720 ◽  
Author(s):  
L. H. Li ◽  
J. X. Zhu ◽  
L. Chen ◽  
A. G. Davies ◽  
E. H. Linfield
Keyword(s):  
High Performance ◽  
Quantum Cascade Lasers ◽  
Terahertz Frequency ◽  
Mbe Growth ◽  
Quantum Cascade ◽  
Cascade Lasers

scholarly journals Gated Bow-Tie Diode for Microwave to Sub-Terahertz Detection

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 829 ◽  
Author(s):  
Steponas Ašmontas ◽  
Maksimas Anbinderis ◽  
Aurimas Čerškus ◽  
Jonas Gradauskas ◽  
Algirdas Sužiedėlis ◽  
...  
Keyword(s):  
Hot Electrons ◽  
Voltage Sensitivity ◽  
Terahertz Frequency ◽  
Remarkable Effect ◽  
Terahertz Detection ◽  
Radiation Sensor ◽  
Asymmetrical Shape ◽  
Wide Contact ◽  
Magnitude Increase ◽  
Bow Tie

We propose a new design microwave radiation sensor based on a selectively doped semiconductor structure of asymmetrical shape (so-called bow-tie diode). The novelty of the design comes down to the gating of the active layer of the diode above different regions of the two-dimensional electron channel. The gate influences the sensing properties of the bow-tie diode depending on the nature of voltage detected across the ungated one as well as on the location of the gate in regard to the diode contacts. When the gate is located by the wide contact, the voltage sensitivity increases ten times as compared to the case of the ungated diode, and the detected voltage holds the same polarity of the thermoelectric electromotive force of hot electrons in an asymmetrically shaped n-n+ junction. Another remarkable effect of the gate placed by the wide contact is weak dependence of the detected voltage on frequency which makes such a microwave diode to be a proper candidate for the detection of electromagnetic radiation in the microwave and sub-terahertz frequency range. When the gate is situated beside the narrow contact, the two orders of sensitivity magnitude increase are valid in the microwaves but the voltage sensitivity is strongly frequency-dependent for higher frequencies.

scholarly journals Surface Wave Enhanced Sensing in the Terahertz Spectral Range: Modalities, Materials, and Perspectives

Sensors ◽  
2019 ◽  
Vol 19 (24) ◽  
pp. 5505 ◽  
Author(s):  
Mathieu Poulin ◽  
Steven Giannacopoulos ◽  
Maksim Skorobogatiy
Keyword(s):  
Surface Wave ◽  
Spectral Range ◽  
High Performance ◽  
Terahertz Frequency ◽  
Wave Localization ◽  
Artificial Materials ◽  
Naturally Occurring ◽  
High K ◽  
Non Destructive ◽  
Plasmon Polaritons

The terahertz spectral range (frequencies of 0.1–10 THz) has recently emerged as the next frontier in non-destructive imaging and sensing. Here, we review amplitude-based and phase-based sensing modalities in the context of the surface wave enhanced sensing in the terahertz frequency band. A variety of surface waves are considered including surface plasmon polaritons on metals, semiconductors, and zero gap materials, surface phonon polaritons on polaritonic materials, Zenneck waves on high-k dielectrics, as well as spoof surface plasmons and spoof Zenneck waves on structured interfaces. Special attention is paid to the trade-off between surface wave localization and sensor sensitivity. Furthermore, a detailed theoretical analysis of the surface wave optical properties as well as the sensitivity of sensors based on such waves is supplemented with many examples related to naturally occurring and artificial materials. We believe our review can be of interest to scientists pursuing research in novel high-performance sensor designs operating at frequencies beyond the visible/IR band.

A High Performance Energy Analyzer for Use in Electron Scanning Microscopy

1969 ◽  
Vol 27 ◽  
pp. 14-15
Author(s):  
A. V. Crewe ◽  
M. Isaacson ◽  
D. Johnson
Keyword(s):  
High Performance ◽  
Vertical Plane ◽  
Median Plane ◽  
Electron Gun ◽  
Uniform Field ◽  
Loss Mechanism ◽  
Electron Scanning Microscopy ◽  
Sector Type ◽  
Double Focusing ◽  
Electron Energy Loss

A double focusing magnetic spectrometer has been constructed for use with a field emission electron gun scanning microscope in order to study the electron energy loss mechanism in thin specimens. It is of the uniform field sector type with curved pole pieces. The shape of the pole pieces is determined by requiring that all particles be focused to a point at the image slit (point 1). The resultant shape gives perfect focusing in the median plane (Fig. 1) and first order focusing in the vertical plane (Fig. 2).

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