Terahertz time-domain spectroscopy technique for characterizing GaN thin film

2006 ◽  
Author(s):  
Tsong-Ru Tsai ◽  
Shi-Jie Chen ◽  
Chih-Fu Chang ◽  
Tai-Yuan Lin ◽  
Cheng-Chung Chi
Keyword(s):  
Thin Film ◽  
Time Domain ◽  
Spectroscopy Technique ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy

Soot Optical Properties in the Terahertz Spectra Domain

2012 ◽  
Vol 134 (7) ◽  
Author(s):  
Fei Wang ◽  
Ting Xu ◽  
Zhishen Qiang ◽  
Qunxing Huang ◽  
Dong Liu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Time Domain ◽  
Wavelength Region ◽  
Optical Methods ◽  
Optical Data ◽  
Refractive Indices ◽  
Spectroscopy Technique ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy ◽  
Combustion Diagnostics

For understanding and accurately modeling combustion, the important questions are what species are present in the flame, and the spatial distribution and temperature of these species. Traditional optical methods used only the electromagnetic waves in the wavelength region from the ultraviolet region up to the infrared. Terahertz time-domain spectroscopy technique can be used for the combustion research as a novel tool. However, for some sooty combustion environments, the strong absorption, spectral interference from soot scattering, and fluorescence from large molecules must be considered. The optical properties of soot in the terahertz domain are the main basic data for terahertz application. In this paper, the terahertz time-domain spectroscopy technique was used to study the optical properties of flame soot within 0.2–1.6 THz. The complex refractive indices of the soot were deduced by the fixed-point iteration method. In order to validate the results, the complex refractive indices of the soot from the four different fuel flames were deduced. It was found that the complex refractive indices in the terahertz domain of the soot from the different fuel flames are very close to each other. The comparisons of complex refractive indices between the visible–IR domain and the terahertz domain indicate that the value of absorption index in terahertz domain is smaller than in IR domain, which implies that the terahertz wave will penetrate the sooty flame with smaller absorption than the IR rays. The results can provide the basic optical data of flame soot for the application of terahertz time-domain spectroscopy technique in the optical combustion diagnostics and extend the optical combustion diagnostics application area.

Detecting mouse glioma tissues with a terahertz time-domain spectroscopy technique

2021 ◽  
Author(s):  
Yuansen Guo ◽  
Shi Wang ◽  
Tunan Chen ◽  
Hua Zhang ◽  
Dandan Li ◽  
...  
Keyword(s):  
Time Domain ◽  
Spectroscopy Technique ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy ◽  
Mouse Glioma

A DIELECTRIC PROPERTY ANALYSIS OF FERROELECTRIC THIN FILM USING TERAHERTZ TIME-DOMAIN SPECTROSCOPY

2007 ◽  
Vol 95 (1) ◽  
pp. 83-91 ◽  
Author(s):  
HAN-CHEOL RYU ◽  
MIN-HWAN KWAK ◽  
SEUNG-BEOM KANG ◽  
SE-YOUNG JEONG ◽  
MUN-CHEOL PAEK ◽  
...  
Keyword(s):  
Thin Film ◽  
Dielectric Property ◽  
Time Domain ◽  
Ferroelectric Thin Film ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy ◽  
Property Analysis

scholarly journals Multiscale understanding of electric polarization in poly(vinylidene fluoride)-based ferroelectric polymers

2020 ◽  
Vol 8 (46) ◽  
pp. 16436-16442 ◽  
Author(s):  
Nan Meng ◽  
Xintong Ren ◽  
Xiaojing Zhu ◽  
Jiyue Wu ◽  
Bin Yang ◽  
...  
Keyword(s):  
Time Domain ◽  
Vinylidene Fluoride ◽  
Impedance Analysis ◽  
Electric Polarization ◽  
Spectroscopy Technique ◽  
Terahertz Time Domain Spectroscopy ◽  
Ferroelectric Polymers ◽  
Time Domain Spectroscopy ◽  
Poly Vinylidene Fluoride

The electric polarization of ferroelectric polymers with tailored structures was studied using the terahertz time-domain spectroscopy technique combined with impedance analysis.

scholarly journals Limitation in thin-film sensing with transmission-mode terahertz time-domain spectroscopy

2014 ◽  
Vol 22 (1) ◽  
pp. 972 ◽  
Author(s):  
Withawat Withayachumnankul ◽  
John F. O’Hara ◽  
Wei Cao ◽  
Ibraheem Al-Naib ◽  
Weili Zhang
Keyword(s):  
Thin Film ◽  
Time Domain ◽  
Transmission Mode ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy

scholarly journals Characterization of Proton-Irradiated Polyaniline Nanoparticles Using Terahertz Thermal Spectroscopy

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 765
Author(s):  
Seung Jae Oh ◽  
Yoochan Hong ◽  
Ki-Young Jeong ◽  
Inhee Maeng ◽  
Jin-Suck Suh ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Proton Beam ◽  
Light Source ◽  
Time Domain ◽  
Infrared Light ◽  
Spectroscopy Technique ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy ◽  
Polyaniline Nanoparticles

In this study, we investigated the changes in the molecular structure of polyaniline (PANI) nanoparticles illuminated by a proton beam using terahertz (THz) thermal spectroscopy based on the terahertz time-domain spectroscopy technique. PANI nanoparticles in water were exposed to a proton beam of 35 MeV energy with a particle fluence of 1013 particles/cm2. The photothermal properties of this solution of PANI nanoparticles were characterized using THz thermal spectroscopy. We measured the changes in the amplitudes of the reflected THz pulses to identify the variations in temperature induced by the photothermal effects of the PANI nanoparticle solution. The amplitude of a reflected THz pulse of the PANI solution not exposed to the proton beam increased when illuminated by an infrared light source, whereas that of THz signals of the PANI solution exposed to the proton beam hardly exhibited any changes. This implies that the molecular structure of PANI nanoparticles can be varied by a proton beam with a particle fluence above 1013 particles/cm2.

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