Title :
Multichannel THz line detection by a microlens array excited photoconductive antenna array
Author :
Pradarutti, B. ; Müller, R. ; Matthäus, G. ; Freese, W. ; Riehemann, S. ; Notni, G. ; Nolte, S. ; Tünnermann, A.
Author_Institution :
Fraunhofer Inst. for Appl. Opt. & Precision Eng. (IOF), Jena
Abstract :
We present multichannel THz ultrashort pulse detection by a photoconductive antenna array consisting of 16 photoconductive antennas. The efficient excitation of the photoconductive antennas has been realized by a microlens array which creates 16 single spots from the exciting fs-laser beam. The detected THz signal/noise ratio has been improved by an order of magnitude in comparison to an excitation by a line focus.
Keywords :
high-speed optical techniques; laser beams; lens antennas; microlenses; microwave photonics; photoconducting devices; submillimetre wave antennas; submillimetre wave detectors; femtosecond-laser beam; microlens array; multichannel THz line detection; multichannel THz ultrashort pulse detection; photoconductive antenna array; Antenna arrays; Focusing; Laser excitation; Lenses; Microoptics; Optical arrays; Photoconductivity; Pulse amplifiers; Semiconductor device noise; Signal to noise ratio;
Conference_Titel :
Infrared, Millimeter and Terahertz Waves, 2008. IRMMW-THz 2008. 33rd International Conference on
Conference_Location :
Pasadena, CA
Print_ISBN :
978-1-4244-2119-0
Electronic_ISBN :
978-1-4244-2120-6
DOI :
10.1109/ICIMW.2008.4665819
