Strong Dispersive Propagation of Terahertz Wave: Time‐Domain Self‐Consistent Modeling of Metallic Wall Losses

2020 ◽  
Vol 3 (3) ◽  
pp. 1900218
Author(s):  
Zi‐Chao Gao ◽  
Chao‐Hai Du ◽  
Fan‐Hong Li ◽  
Shi Pan ◽  
Zi‐Wen Zhang ◽  
...  
Keyword(s):  
Time Domain ◽  
Terahertz Wave ◽  
Metallic Wall ◽  
Self Consistent ◽  
Wall Losses ◽  
Dispersive Propagation

Study on Detection of Insulator Defects in Time Domain Terahertz Wave

2018 ◽  
Author(s):  
Rui Wang ◽  
Zhonghao Zhang ◽  
Cuiru Yang ◽  
Zhangxiang Nie ◽  
Liming Wang ◽  
...  
Keyword(s):  
Time Domain ◽  
Terahertz Wave

scholarly journals Time Domain Spectroscopy/Imaging and Wireless Data Transfer Technologies with Terahertz Wave

2010 ◽  
Vol 19 (3) ◽  
pp. 12
Author(s):  
Mun Cheol PAEK ◽  
Min Hwan KWAK ◽  
Sungil KIM ◽  
Seung Beom KANG ◽  
Hancheol RYU ◽  
...  
Keyword(s):  
Time Domain ◽  
Data Transfer ◽  
Terahertz Wave ◽  
Wireless Data ◽  
Time Domain Spectroscopy

Properties of Bi and BiSb Nano-Dimensional Layers in Thz Frequency Range

2020 ◽  
Vol 312 ◽  
pp. 206-212
Author(s):  
Ivan L. Tkhorzhevskiy ◽  
Anton D. Zaitsev ◽  
Petr S. Demchenko ◽  
Dmitry V. Zykov ◽  
Aleksei V. Asach ◽  
...  
Keyword(s):  
Phase Shift ◽  
Time Domain ◽  
Terahertz Wave ◽  
Film Structure ◽  
Charge Carriers ◽  
Frequency Range ◽  
Terahertz Time Domain Spectroscopy ◽  
Antimony Content ◽  
Mobility Of Charge Carriers ◽  
Substrate Film

In the present paper we demonstrate and compare different properties of Bi and Bi1-xSbx thin films placed on polyimide (PI) substrate in frequency range from 0.2 to 1.0 THz. Bi films with a thickness of 40, 105 and 150 nm have been studied as well as 150 nm Bi1-xSbx solid solutions with Sb concentration of 5, 8, 12 and 15 %. An effective refractive index and permittivity of whole substrate/film structures have been derived by using terahertz time-domain spectroscopy (THz-TDS) method. These measurements have shown the positive phase shift in PI substrate with a thickness of 42 μm and revealed that it is barely transparent in studied frequency range, but the whole substrate/film structure provides the negative phase shift of terahertz wave. It was shown that the permittivity depends on mobility of charge carriers which is driven by film thickness and antimony content.

Research of Landmine Detection Using Terahertz Technology

2014 ◽  
Vol 644-650 ◽  
pp. 1313-1316 ◽  
Author(s):  
Qing Miao ◽  
Gao Wang ◽  
Yang Jun Li
Keyword(s):  
Time Domain ◽  
Major Part ◽  
Terahertz Wave ◽  
Landmine Detection ◽  
Terahertz Range ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy ◽  
Characteristic Spectrum ◽  
Terahertz Technology

The detection of landmines has become a hard task to deal with because of the diversity of landmines and the complexity of minefield. The development of terahertz technologies has provided a feasible way to detect the buried landmines. Landmines’ shell is usually made of ceramics, plastics, even wood and so on, which terahertz wave could penetrate them easily. The explosives are the major part of landmines. Many types of explosives have the characteristic spectrum in terahertz range, so it would be an effective method to detect landmines by measuring the spectrum of explosives with terahertz time-domain spectroscopy.

FABRICATION AND CHARACTERIZATION OF BROADBAND TERAHERTZ WIRE-GRID POLARIZER

2010 ◽  
Vol 19 (04) ◽  
pp. 827-833 ◽  
Author(s):  
Z. C. CHEN ◽  
M. H. HONG ◽  
T. C. CHONG
Keyword(s):  
Time Domain ◽  
Quartz Substrate ◽  
Terahertz Wave ◽  
Mean Value ◽  
Frequency Range ◽  
Terahertz Time Domain Spectroscopy ◽  
Free Standing ◽  
Wire Grid ◽  
The Wire ◽  
Wire Grid Polarizer

A wire-grid terahertz polarizer fabricated on quartz substrate working in broadband is demonstrated. The transmission spectra of the fabricated wire-grid polarizer are characterized by terahertz time domain spectroscopy, showing the good performance of this polarizer in the terahertz frequency range up to 3.5 THz. The transmission of the peak in the time domain is 80% when the incident terahertz wave polarization is perpendicular to the wire-grid. The transmission of the peak is lower than 10% when the incident polarization is parallel to the wire-grid. The polarization factor ranges from 0.92–0.99 with the mean value of 0.97 in the frequency range from 0.1 to 3.5 THz, which is better than that of the free-standing wire-grid polarizer.

Entropy and the Spontaneous Emission of Plasma Waves

1977 ◽  
Vol 3 (2) ◽  
pp. 174-177
Author(s):  
R. J. M. Grognard
Keyword(s):  
Time Domain ◽  
Solar Radio ◽  
Plasma Waves ◽  
Radio Bursts ◽  
Solar Radio Bursts ◽  
Self Consistent ◽  
The Time Domain ◽  
Astrophysical Research ◽  
Secular Terms ◽  
Domain Of Validity

The emission of plasma waves by beams of electrons travelling in a plasma is a phenomenon of critical importance in applied plasma physics (for instance in problems directly related to the achievement of controlled nuclear fusion) and also astrophysical research (e.g. in the theory of solar radio bursts). In principle, the mechanisms involved are all contained in the Boltzmann-Vlasov equation, where the field is the self-consistent electromagnetic field produced by the interaction between beam and plasma. Unfortunately this celebrated equation cannot be solved directly, because both the analytical and numerical methods that can deal with this equation are plagued by secular terms which restrict the time domain of validity of the solutions to a few thousand plasma periods. In all applications of interest this domain is far too small; indeed in all astrophysical cases it is quite negligible compared with the duration of the observed phenomena (it is even much shorter than the time resolution of present-day equipment, such as dynamic spectrographs).

Creation of Titania Artificial Interfaces with Geometric Patterns by Using Micro Stereolithography and Aqueous Solution Techniques

2012 ◽  
Vol 2012 (CICMT) ◽  
pp. 000117-000122
Author(s):  
Soshu Kirihara ◽  
Yousuke Itakura ◽  
Satoko Tasaki
Keyword(s):  
Time Domain ◽  
Anatase Phase ◽  
Far Infrared ◽  
Terahertz Wave ◽  
Terahertz Waves ◽  
Glass Substrates ◽  
Geometric Patterns ◽  
Water Solvent ◽  
Micro Patterning ◽  
Geometric Arrangements

Titania micro patterns with periodic arrangements were formed on glass substrates successfully for electromagnetic wave energy resonations and localizations in terahertz frequency ranges. Geometric arrangements of acryl polygon tablets with titania particles dispersions by using micro patterning stereolithography. Moreover, periodically arranged full titania tablets with anatase phase were created homogeneously though liquid phase crystal depositions of water solvent processes under micro templates fabricated by using the stereolithography system. The terahertz wave properties were measured and simulated by a using time domain spectroscopic system and finite difference time domain method. The terahertz waves having micrometer order wavelengths and belonging in far-infrared frequency ranges are expected to apply for various types of novel sensors which can detect micro cracks on materials surfaces, micro defects in electric devices, bacteria in foods, and cancer cells in human skins.

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