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Pump beam diameter dependent terahertz generation from surface emitters - experiment and simulation

: Theuer, M.; Imhof, C.; Torosyan, G.; Ellrich, F.; Zengerle, R.; Beigang, R.


Institute of Electrical and Electronics Engineers -IEEE-; IEEE Microwave Theory and Techniques Society:
33rd International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2008. Vol.2 : 16th International Conference on Terahertz Electronics; 15.-19.9.2008 Pasadena, California, USA
New York, NY: IEEE, 2008
ISBN: 978-1-4244-2120-6
ISBN: 978-1-4244-2119-0
International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz) <33, 2008, Pasadena/Calif.>
International Conference on Terahertz Electronics <16, 2008, Pasadena/Calif.>
Fraunhofer IPM ()

We report on tershertz wave generation using transient photoconductivity induced by femtosecond laser pulses in semiconductor surfaces. In particular the dependence of terahertz emission characteristics on pump pulse parameters like diameter and input angle is investigated in detail both experimentally and theoretically. It is shown that the emission in forward (quasi-optical reflection) as well as in backward direction (back to the laser) is strongly depending on the diameter of the pump beam on the semiconductor. This is explained in terms of Huygens' principle of fundamental waves together with a Hertzian dipole model. The emission properties are simulated using CST MICROWAVE STUDIO (R) and compared with experimental results.