Refractive index is an important optical parameter that can be used to characterize the
physicochemical properties of pharmaceutical solids. The complexity of most drugs and …

Measurements of optical constants at terahertz—or T-ray—frequencies have been
performed extensively using terahertz time-domain spectroscopy (THz-TDS). Spectrometers …

We present a simple algorithm for removing or reducing spurious oscillations in the THz
spectra which result from secondary reflection peaks in samples or optical elements. The …

Terahertz imaging is becoming a biological imaging modality in its own right, alongside the
more mature infrared and X-ray techniques. Nevertheless, extraction of hyperspectral …

Terahertz Time-Domain Spectroscopy (THz-TDS) has been a powerful tool for material
characterization. The Fabry-Perot (FP) effect caused by the multiple reflections within the …

Water vapor noise in the air affects the accuracy of optical parameters extracted from
terahertz (THz) time-domain spectroscopy. In this paper, a numerical method was proposed …

Measurement precision is often required in the process of material parameter extraction.
This fact is applicable to terahertz time-domain spectroscopy (THz-TDS), which is able to …

We present three techniques of calibrating frequency and spectral profile measurements of
terahertz time-domain spectrometers. The first utilizes the etalon effect generated by multiple …

The reliability of material characterization with terahertz (THz) waves is typically
compromised by irrelevant signals present in the THz measurements. These are well …

Algorithms are described which allow a significant reduction of the effects of multiple pulses,
which originate from pulse reflections within terahertz (THz) emitters. The algorithms are …