Permittivity and Loss Characterization of Polymer Films for Terahertz Applications

Tsz ki Liu

doi:10.54097/hset.v15i.2219

Authors

Tsz ki Liu

DOI:

https://doi.org/10.54097/hset.v15i.2219

Keywords:

Terahertz Applications; Polymer Films; Dielectric Constant.

Abstract

With the development of science, terahertz (THz) technology has matured gradually. More attention has been given to THz technology in recent years due to its superiority for non-destructive testing. Dielectric polymers are widely used in electrical engineering because of their unique electrical properties. Spectral detection plays a vital role in studying the internal motion and micro-scale forces. THz time-domain spectroscopy (THz-TDS) is a powerful complement to other spectroscopy techniques because of its unique frequency band that energetically vibrates and rotates the polymer structure. Herein, we apply THz-TDS with an effective frequency of 0.1–1 THz at 55% relative humidity. TDS at 0.1–1 THz to conduct fundamental research on several commonly utilized dielectric non-polar and polar polymer films including PC, FTPE, PMMA, HDPE, PA6, PET, PP. In this study, the THz complex refractive index and dielectric constants of various polymer films are determined and compared with previously reported values. In addition, the loss mechanism of THz radiation in polymers is characterized by correlating the absorption coefficients of the materials with the loss tangents. Herein, we demonstrate that the sample preparation significantly impacts the loss behavior of polymer materials and quantify the effect of crosslinking on the dielectric constant across the entire frequency band. The findings presented herein are expected to contribute to the design and development of optical and electronic devices in the future.

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References

Peter H, Siegel. Terahertz Technology[J]. IEEE Transactions on microwave theory and techniques, 2002, 50(3): 910-920.

Dragoman D, Dragoman M. Review terahertz fields and applications [J]. Progress in Quantum Electronics, 2004, 28(1): 1-66.

M. Yin, S. Tang and M. Tong, "The application of terahertz spectroscopy to liquid petrochemicals detection: A review", Applied Spectroscopy Reviews, vol. 51, no. 5, pp. 379-396, 2016. Available: 10.1080/05704928.2016.1141291 [Accessed 10 April 2019].

M. Godon, J. Carlier and A. Bauer, "Laboratory studies of water vapor absorption in the atmospheric window at 213 GHz", Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 47, no. 4, pp. 275-285, 1992. Available: 10.1016/0022-4073(92)90146-u.

Bour Petr. A cluster model of liquid water and its IR spectroscopic response[J]. Chem. Phys. Letter. 2002, 365(14): 82-88.

Burda Kvetoslava, Bader K P, Schmid G H J. Anestimation of the size of the water cluster present at the cleavage site of the water splitting [J]. FEBS Letters, 2001, 491(15): 81-84.

Zhao Lin. Study on formation mechanism of prethermodenaturation new peak of protein[J]. ACTA Biophysica Sinica, 1999, 15(11): 627-630.

Martin van Exter, Ch. Fattinger, Grischkowsky. Terahertz time-domain spectroscopy of water vapor[J]. Optics Letters, 1989, 14(14): 1128-1130.

R. Alan Cheville, D.Grischkowsky. Observation of pure rotation absorption spectra in the v2 band of hot H2O in flames[J]. Optics Letters, 1998, 23(12): 531-533.

Takashi Arikawa, Kumiko Yamashita, Hikdeki Hirori. Complex dielectric constant of amino-acid solution revealed by THz time-domain attenuated total reflection technique[J]. OTST, 2005, 12(10): 11-33.

Wei Shi and Yujie J. Ding. Direct measurement of resonant frequencies for H2O in the range of 0.2-4.2 THz by frequency-tuning monochromatic THz source[J]. CLEO, 2004, 23(14): 1-12.

Y. Wang, et.al, “Restoration of terahertz signals distorted by atmospheric water vapor Absorption,” J. App. Phy. 105, 103105, 2009.

Jin Y S, Kim G J, Jeon S G. Terahertz dielectric properties of polymers [J]. Journal of the Korean Physical Society, 2006, 49(2): 513-517.

Fedulova EV, Nazarov MM, Angeluts AA, Kitai MS, Sokolov MI, and Shkurinov AP, Studying of dielectric properties of polymers in the terahertz frequency range. [J] Saratov Fall Meeting 2011: Optical Technologies in Biophysics and Medicine XIII, 2012.

Naftaly M, Miles RE. Terahertz time-domain spectroscopy for material characterization[J] Proc. IEEE, 2007, 95(8): 1658-1665.

Hejase J, Paladhi P, Chahal P. Corrections to terahertz characterization of dielectric substrates for component design and non-destructive evaluation of packages. IEEE Transactions on Components, Packaging and Manufacturing Technology. 2013, 3(2): 357-357.

Chang T, Zhang X, Zhang X, Cui H. Accurate determination of dielectric permittivity of polymers from 75 GHz to 16 THz using both S-parameters and transmission spectroscopy. Applied Optics. 2017, 56 (12): 3287.

Piesiewicz R, Jansen C, Wietzke S, Mittleman D, Koch M, Kürner T. Properties of building and plastic materials in the THz range. International Journal of Infrared and Millimeter Waves

Tajvidi M, Ebrahimi G. Water uptake and mechanical characteristics of natural filler-polypropylene composites[J]. Journal of Applied Polymer Science, 2003, 88(4): 941-946.