Terahertz time-domain spectroscopic data of different polymers with different thicknesses

<p>Terahertz time-domain spectroscopy can be used for the extraction of electrical properties from materials. The extraction of the parameters can be done either in reflection or transmission geometry. To determine the exact type of material, the sample’s thickness and incidence angle of the radiation must be well known. However, the differentiation between materials can be realised by using a neural network. To address this question, multiple terahertz time-domain spectroscopic transmission measurements of 16 polymers were done with different thicknesses.</p>
<b>Methods</b>
<p>This dataset consists of terahertz time-domain spectroscopy (THz-TDS) measurements performed on 16 different polymer types with different thicknesses. For each polymer, 3 square sets of samples were fabricated using a fused deposition modeling 3D printer. Two of the sample sets have thicknesses of 1 mm and 5 mm. The third sample set contains 4 thicknesses: 1 mm, 2 mm, 3 mm, and 4 mm and is referred to as verification. For a measurement, all samples of one type were placed in a sample holder. This sample holder was raster scanned in the focusing spot of a terahertz transmission setup. A THz-TDS trace was recorded for each position. Six measurements were made for each sample type.</p>
<p>For each measurement, an .hdf file was created containing the measured THz-TDS traces and a label of the areas with the material of the sample. The corresponding material name can be found in the "Labels.csv" file. The terahertz spectrometer used to record the THz-TDS traces was the TeraK15 from the manufacturer Menlo Systems. Planoconvex TPX lenses were used to focus the terahertz radiation to a point.</p>