12-15 July 2011
Saint George Hotel
Africa/Johannesburg timezone

Time-domain Terahertz Spectroscopy: Principles and applications

14 Jul 2011, 13:45
15m
Acro4

Acro4

Oral Presentation Track C - Lasers, Optics and Spectroscopy LOS

Speaker

Dr Pieter Neethling (Laser Research Institute, University of Stellenbosch)

Description

Time-domain terahertz (TD-THz) spectroscopy has emerged as a valuable tool for studying material properties in the THz region of the electromagnetic spectrum. Many classes of materials exhibit characteristic absorption signatures in this previously unstudied portion of the electromagnetic spectrum. This opens up the possibility for non-destructive and non-invasive testing and analysis of materials which previously have proven difficult. Time domain T Hz spectroscopy entails measuring the electric field of the generated THz pulse in the time domain, and extracting the spectral information from the pulse through a Fourier Transform. Two main mechanisms for generating short, broadband THz pulses have emerged namely optical rectification in a nonlinear crystal of a femtosecond laser pulse and THz generation from a photo-conductive antenna (PCA). Recently, a photo-conductive antenna TD-THz setup has been established at the Laser Research Institute, University of Stellenbosch. This presentation will focus on the basic principles of operation and on the layout of the setup as well as the possible applications envisaged using the setup.

Level (Hons, MSc, <br> &nbsp; PhD, other)? other
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)? No
Consider for a student <br> &nbsp; award (Yes / No)? No

Primary author

Dr Pieter Neethling (Laser Research Institute, University of Stellenbosch)

Co-authors

Dr Christine Steenkamp (Laser Research Institute, University of Stellenbosch) Prof. Erich Rohwer (Laser Research Institute, University of Stellenbosch) Ms Nagla Numan (Laser Research Institute, University of Stellenbosch)

Presentation Materials

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