Thesis (MSc)--Stellenbosch University, 2012. / 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 being
investigated in the THz range. At the heart of THz usage is a THz spectroscopy system
necessary for the generation and detection of the THz radiation. In this thesis, we characterise
such a THz spectroscopy system. In our typical THz spectrometric system, we
make use of femtosecond (fs) laser technology and pump-probe principles for emission and
detection of THz radiation. Background about the principles of generation THz radiation
using fs triggered antennas and the principles of the spectroscopy technique and appropriate
literature references are presented. Using an assembled commercially available kit, we
reproduce known spectra in order to confirm correct functionality (for calibration) of the
assembled spectroscopy system and to gain experience in interpreting these spectra. By
introducing a suitable x - y scanning device we construct a crude THz imaging device to
illustrate the principle. / AFRIKAANSE OPSOMMING: Terahertsstraling word deesdae wyd in die sekuriteits, inligting-en-kommunikasie en biomediese
sektore aangewend. Die gepastheid van terahertsstraling (THz) vir ’n spesifieke
toepassings hang af van die eienskappe van die materiale wat ondersoek word. Vir die
uitvoer van sulke eksperimente word ’n THz-spektroskopie sisteem benodig vir die opwekking
en meting van THz-straling. In hierdie tesis word so ’n THz-spektroskopie sisteem
beskou en gekarakteriseer. In die sisteem word van ’n femtosekondelaser (fs) gebruik
gemaak in ’nn pomp-en-proef opstelling vir die uitstraling en meting van THz-straling. Die
beginsels rakende die opwekking van THz-straling, deur gebruik te maak van ’n antenna
wat deur ’n fs-laser geskakel word, asook die beginsels van die spektroskopiese tegniek, met
toepaslike verwysings, word in die tesis aangebied. Deur gebruik te maak van’n kommersiële
THz opstelling is bekende spektra gemeet om die korrekte funksionering (vir kalibrasie
doeleindes) na te gaan en om ondervinding op te doen in die interpretasie van hierdie spektra.
’n X-Y-translasie toestel is tot die opstelling bygevoeg om THz-afbeelding moontlik
te maak en sodoende hierdie beginsel te illustreer.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/71690 |
| Date | 12 1900 |
| Creators | Numan, Nagla Numan Ali |
| Contributors | Rohwer, Erich. G., Schwoerer, Heinrich P. H., Steenkamp, C. M., Neethling, Pieter H., Stellenbosch University. Faculty of Science. Dept. of Physics. |
| Publisher | Stellenbosch : Stellenbosch University |
| Source Sets | South African National ETD Portal |
| Language | en_ZA |
| Detected Language | Unknown |
| Type | Thesis |
| Format | xiii, 84 p. : ill. (some col.) |
| Rights | Stellenbosch University |
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