Related Experiment Video
Updated: Jan 1, 2026

Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
Published on: September 26, 2014
Origin of pseudo-dispersion in non-dispersive media by terahertz time-domain spectroscopy
Abstract:
We report the false appearance of dispersion in non-dispersive materials when measured by terahertz time-domain spectroscopy. This occurs when the material is measured in reflection geometry and has a bulk metal interface opposite to the incident interface, for example, when a substrate is supported by a metal stage with the THz light incident on it from above. We explain this effect in terms of the frequency-dependent response of the material when it is represented by a shorted transmission line model.
Related Concept Videos
IR Spectrometers
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
IR Absorption Frequency: Delocalization
In IR...
Distribution and Dispersion

