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This study demonstrates the analysis of anisotropic pore structures of highly porous pharmaceutical powder compacts by combining terahertz time-domain spectroscopy and in-situ measurements of the liquid penetration using terahertz pulsed imaging.
We describe time-domain terahertz spectroscopy measurements of the frequency-dependent conductivity in MnSi thin films. We find that at low temperatures and frequencies, the scattering rate is proportional to both the square of the temperature and the square of the frequency, as predicted Fermi liquid theory. Unlike measurements on many other systems, the prefactors for each functional dependence...
This work presents the performance analysis of a compact electrical permittivity sensor based on monopoles-coupled Split Ring Resonator to measure the dielectric properties changes in liquids. The sensor was designed and fabricated on standard FR4 substrate with a dielectric constant εr=4.4 with 1.56 mm of thickness and the optimized dimension of 35 × 50 mm2. Simulation results are made using finite...
Precise temperature-control is necessary for many spectroscopic measurements. We present the temperature-dependent complex THz refractive index of liquid samples measured in a flowcell, analysed by a numerical method that allows simultaneous extraction of the sample's thickness to verify the temperature-stability of the cell.
Liquid water is a strong absorber in THz range, making the presence of water a nuisance when collecting measurements within this frequency regime. Here, we experimentally demonstrate the generation of broadband THz waves from liquid water with a femtosecond laser. The signal is obtained when a high-intensity laser beam is focused within a water film. This THz signal is distinguished from the signal...
We demonstrate an active tunable filter with channel add-drop functionality by employing electronically reconfigurable liquid metals in the gap between two waveguides to dynamically modify the coupling.
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...
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