Refractive Index at THz Frequencies of Various Plastics

Folks, William R.; Pandey, Sidhartha K.; Boreman, Glenn D.

doi:10.1364/otst.2007.md10

Cited by 14 publications

(8 citation statements)

References 8 publications

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“…For the pure PE samples (#2 and #3), the measured refractive index n of 1.54, displayed in Fig. 2(b), is in good agreement with literature values for bulk HDPE (1.534 to 1.546 at 1 THz) [39,[42][43][44]. Also a refractive index of 1.45 to 1.46 for the pure PTFE pellets (#7-10) shown in Fig.…”

Section: Low-absorbing Micro-powderssupporting

confidence: 87%

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Characterization of Micro-Powders for the Fabrication of Compression Molded THz Lenses

Scherger

Wietzke

Scheller

et al. 2011

J Infrared Milli Terahz Waves

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We investigate different micro-powders that can be used as base materials for THz lenses fabricated by compression molding. For this application materials with a very weak THz absorbance and low dispersion are required. By measuring the THz absorption coefficient and refractive index of pellets pressed from the different micro-powders, we identify several materials that are well suited for the fabrication of compression molded THz lenses (CMLs). In addition, a considerable range of the refractive index is covered by the samples, which will allow for the fabrication of CMLs with different focal lengths for one and the same lens design.

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Section: Low-absorbing Micro-powderssupporting

confidence: 87%

“…Also a refractive index of 1.45 to 1.46 for the pure PTFE pellets (#7-10) shown in Fig. 3(b)) matches the results reported for bulk PTFE (1.43 to 1.45 at 1 THz) [39,42,44]. Therefore, these samples can be estimated as equal to bulk material with respect to their THz dielectric parameters.…”

Section: Low-absorbing Micro-powderssupporting

confidence: 81%

Characterization of Micro-Powders for the Fabrication of Compression Molded THz Lenses

Scherger

Wietzke

Scheller

et al. 2011

J Infrared Milli Terahz Waves

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show abstract

“…The refractive index m in the THz regime is already available for many materials from the literature [16,19,20,21]. It can also be measured using THz spectroscopy and bulk samples [22].…”

Section: Discussionmentioning

confidence: 99%

Particle characterization using THz spectroscopy

2015

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THz extinction spectroscopy extends UV-Vis and NIR-spectroscopy to characterize particles from fine powders and dust to sand, grains and granulated materials. We extract particle sizes from the spectral position of the first peak of the interference structure and size distributions from the visibility of the fine ripple structure in the measured extinction spectra. As such, we can demonstrate a route for a quick determination of these parameters from single measurements.Comment: 6 pages, 6 figure

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“…There are some polymer materials, such as polymethylpentene (known as TPX), polyethylene (PE), COP, PS, and polytetrafluoroethylene, that are transparent in the THz region [19,20]. From these candidates, we chose a low-density PE because of the relatively small absorption coefficient and the easiness of the drawing process.…”

Section: Design and Fabricationmentioning

confidence: 99%

Fabrication method of small-diameter hollow waveguides for terahertz waves

2012

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To develop a thin and flexible hollow waveguide for terahertz (THz) waves that can be applied to endoscopic applications, a new (to our knowledge) fabrication method is proposed in which thin polymer tubing is first drawn and then a silver layer is formed on the outside of the tubing. By using this method, a thick dielectric layer, which was difficult to form by liquid-phase deposition, is easily obtained with high accuracy in the thickness. A transmission loss at 1.5 THz measured by a Fourier transform IR spectrometer was 3.0 dB for a 50 cm long, 1 mm innerdiameter waveguide. It is shown that the transmission losses are not affected by the bending of the waveguide when the bending radius is larger than around 10 cm.

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Refractive Index at THz Frequencies of Various Plastics

Abstract: We measure the refractive index via a minimum deviation prism technique of various plastics from 70-290µm (1-4THz) using a tunable terahertz gas laser. We find these plastics have indices varying from 1.43-1.61 over this range.

Cited by 14 publications

References 8 publications

Characterization of Micro-Powders for the Fabrication of Compression Molded THz Lenses

Characterization of Micro-Powders for the Fabrication of Compression Molded THz Lenses

Particle characterization using THz spectroscopy

Fabrication method of small-diameter hollow waveguides for terahertz waves

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