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Micro lens coupled large area photoconductive switch for powerful THz emission

: Matthäus, G.; Hohmuth, R.; Voitsch, M.; Richter, W.; Riehemann, S.; Notni, G.; Nolte, S.; Tünnermann, A.


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. Online proceedings : 16th International Conference on Terahertz Electronics; 15.-19.9.2008 Pasadena, California, USA
New York, NY: IEEE, 2008
ISBN: 978-1-4244-2119-0
ISBN: 978-1-4244-2120-6
Art. 4665625
International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz) <33, 2008, Pasadena/Calif.>
Conference Paper
Fraunhofer IOF ()

Powerful THz emission based on a finger electrode photoconductive switch attached to a micro lens array is presented. A hexagonal packed lens array directs the incident pump light into specified electrode gaps, yielding only constructive interference in the THz far-field. Using a Ti:Sapphire system operating at 80 MHz with 150 fs pulses and 3 W maximum optical excitation, 0.28 mW THz average power is obtained. The maximum IR-to-THz conversion efficiency is 1.3×10-4.