Remote Spectral Identification in the THz Band with Reflection Spectroscopy in an Open Atmosphere

Abstract

Spectroscopy in the terahertz (THz) band has been discussed as a promising tool for identifying substances such as mold in food, narcotics, or explosive materials. Other than the technological limitations, the most important difficulty is the presence of water vapor in the atmosphere, which affects THz measurements. In this paper, we present a systematic approach to the challenging subject of remote identification. We start with a brief analysis of the technical capabilities of the THz components and report the choice of devices for designing an experimental setup for reflection spectroscopy. We follow with the presentation of the transmission THz spectrometer working in an open atmosphere. Research conducted on the transmission configuration provides findings that are implemented in the experimental setup working in a reflective configuration. The final phase is an experiment providing data measured in the reflection configuration with the presence of water vapor, allowing the use of spectra in the identification of the measured samples.

An artificially re-structured PEDOT:PSS/konjac glucomannan sponge toward high-performance electromagnetic interference shielding from gigahertz to terahertz bands

“…Up to now, fifth-generation (5G) communication has penetrated our daily life with high frequency of the gigahertz (GHz) range, while many researchers have imagined and many countries have planned 1–3 that sixth-generation (6G) communication will be dominated by terahertz (THz) bands and high-frequency GHz bands, so surrounding objects and human health will be widely impacted by much higher frequency electromagnetic waves (EMWs). In addition, THz technology has been diversely utilized in other futuristic fields, such as broadband spectroscopy, 4–6 intelligent imaging 7,8 and biological sensing. 9,10 Accordingly, the development of light as well as flexible materials possessing broadband, tunable and extremely high electromagnetic interference (EMI) shielding performance is of great significance.…”