TY - JOUR A1 - Beckmann, Jörg A1 - Marchetti, B. A1 - von Chrzanowski, Lars S. A1 - Ritter, E. A1 - Puskar, L. A1 - Aziz, E. F. A1 - Schade, U. T1 - Optical constants of harmful and highly energetic liquids for application to THz screening systems JF - IEEE Transactions on Terahertz Science and Technology N2 - The far-infrared (IR) optical constants of a set of hazardous and flammable liquids have been obtained by means of spectroscopic ellipsometry in attenuated total reflection configuration over a broad spectral range. Such liquids recently became of considerable concern for transportation security measures worldwide. Their optical identification at check-in gates can only become possible if the characteristic spectra are already known. The refractive indices and the extinction coefficients reported here contribute to a spectroscopic data base in the far-IR and terahertz (THz) spectral regions and may support modeling the performance of THz screening systems on liquids for airports and other security sensitive areas. Examples of several container material/liquid systems are discussed. From the measured optical constants typical THz waveforms are calculated and discussed. KW - liquids material characterization KW - Ellipsometry KW - FT-IR spectroscopy KW - THz time-domain spectroscopy (THz-TDS) PY - 2016 DO - https://doi.org/10.1109/TTHZ.2016.2547319 SN - 2156-342X VL - 2016 / Vol. PP IS - 99 SP - 1 EP - 12 PB - IEEE - Inst. Electrical Electronics Engineers Inc CY - New York, NY, USA AN - OPUS4-36366 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schade, U. A1 - Ritter, E. A1 - Aziz, E. F. A1 - Puskar, L. A1 - Beckmann, Jörg T1 - Spectroscopic ellipsometry on liquids in the far infrared T2 - International Conference of Infrared Millimeter AND THz waves N2 - The far infrared refractive indices and the extinction coefficients of liquids can be obtained by means of spectroscopic ellipsometry in attenuated total reflection configuration. Such optical constants will contribute to a spectroscopic data base in the far infrared and terahertz spectral regions. The experimental implementation and the calibration procedure of the method are described in detail. The temperature dependency of the optical constants for water over a broad spectral range is exemplarily presented. T2 - 42nd International Conference on Infrared, Millimeter and THz Waves CY - Cancun, Mexico DA - 27.08.2017 KW - Ellipsometry KW - Far Infrared KW - ATR KW - Attenuated total reflection KW - Calibration KW - Extinction coefficients KW - Refractive index measurement KW - Spectroscopic ellipsometry KW - Far infrared refractive index KW - Terahertz spectral region KW - Optical constant KW - Attenuated total reflection configuration KW - Liquid extinction coefficient KW - Optical refraction KW - Optical variables control KW - Optical reflection KW - Liquids KW - Optical films KW - Optical polarization KW - Optical variables measurement PY - 2017 UR - http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8066931&isnumber=8066832 DO - https://doi.org/10.1109/IRMMW-THz.2017.8066931 SN - 2162-2035 SP - MD.1.5-1 EP - MD.1.5-2 PB - IEEE CY - Danvers AN - OPUS4-42028 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -