Terahertz (THz) spectroscopy

[摘要] ENGLISH ABSTRACT: Terahertz radiation is currently used in security, information and communication technology(ICT), and biomedical sciences among others. The usability of terahertz (THz)radiation, in many of its applications depends on characteristics of the materials beinginvestigated in the THz range. At the heart of THz usage is a THz spectroscopy systemnecessary for the generation and detection of the THz radiation. In this thesis, we characterisesuch a THz spectroscopy system. In our typical THz spectrometric system, wemake use of femtosecond (fs) laser technology and pump-probe principles for emission anddetection of THz radiation. Background about the principles of generation THz radiationusing fs triggered antennas and the principles of the spectroscopy technique and appropriateliterature references are presented. Using an assembled commercially available kit, wereproduce known spectra in order to confirm correct functionality (for calibration) of theassembled spectroscopy system and to gain experience in interpreting these spectra. Byintroducing a suitable x - y scanning device we construct a crude THz imaging device toillustrate the principle.

[发布机构] Stellenbosch University