Measurement of dielectric constant and loss tangent of several common dielectrics by terahertz time domain spectroscopy

2021 ◽  
Author(s):  
Bowen Fan ◽  
ZhaoHang Peng ◽  
Wei Miao ◽  
Shengcai Shi
Keyword(s):  
Dielectric Constant ◽  
Loss Tangent ◽  
Time Domain ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy ◽  
Dielectric Constant And Loss

Far-infrared dielectric constant of porous silicon layers measured by terahertz time-domain spectroscopy

1998 ◽  
Vol 83 (11) ◽  
pp. 6007-6010 ◽  
Author(s):  
S. Labbé-Lavigne ◽  
S. Barret ◽  
F. Garet ◽  
L. Duvillaret ◽  
J.-L. Coutaz
Keyword(s):  
Dielectric Constant ◽  
Porous Silicon ◽  
Time Domain ◽  
Far Infrared ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy

scholarly journals Detection of Microplastic in Salts Using Terahertz Time-Domain Spectroscopy

Sensors ◽  
2021 ◽  
Vol 21 (9) ◽  
pp. 3161
Author(s):  
Jaeseung Im ◽  
Taewon Goo ◽  
Jugyoung Kim ◽  
Soobong Choi ◽  
Sung Ju Hong ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Refractive Index ◽  
Optical Properties ◽  
Time Domain ◽  
High Density Polyethylene ◽  
Volume Ratio ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy ◽  
Practical Applications ◽  
Effective Medium Model

We report on a prototypical study of the detection of microplastic embedded in table salts by using terahertz time-domain spectroscopy. In the experiment, high-density polyethylene (HDPE) of sizes from 150 to 400 μm are used as a representative microplastic and mixed with table salts. Analyzing terahertz transmittance with an effective medium model, we extract various optical properties such as refractive index, absorption coefficient, and real/imaginary parts of the dielectric constant of the mixture. Consequently, the optical properties exhibit volume-ratio-dependence in 0.1–0.5 THz regimes. Especially, the refractive index and the real part of the dielectric constant possess monotonic frequency dependence, meaning that the quantities can be relevant indicators for the detection of the microplastic in terms of practical applications. Our work proves that terahertz time-domain spectroscopy can pave a way to recognize microplastic mixed with salts and be expanded for detecting various micro-sized particles.

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