THz generation from graphite

Subpicosecond terahertz pulses are generated from the surfaces of graphite samples, when illuminated with femtosecond near-infrared laser pulses. Our experiments with highly oriented pyrolytic graphite samples suggest that the emission of THz radiation is caused by photoinduced transient charge carr...

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Bibliographic Details
Published in2009 34th International Conference on Infrared, Millimeter, and Terahertz Waves pp. 1 - 2
Main Authors Ramakrishnan, G., Chakkittakandy, R., Planken, P.C.M.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.09.2009
Subjects
Laser excitation
Optical pulse generation
Optical pulses
Optical surface waves
Polarization
Power generation
Radiation detectors
Surface emitting lasers
Ultrafast electronics
Ultrafast optics
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Summary:Subpicosecond terahertz pulses are generated from the surfaces of graphite samples, when illuminated with femtosecond near-infrared laser pulses. Our experiments with highly oriented pyrolytic graphite samples suggest that the emission of THz radiation is caused by photoinduced transient charge carrier movements along the c-axis of the crystal. This is further confirmed by studying the effects of an in-plane magnetic-field which deflects the photocurrent and thereby changes the THz polarization. The experimental results point to two possible generation mechanisms, carrier acceleration in the space charge layer near the graphite surface and/or the photo-Dember effect.
ISBN:1424454166
9781424454167
ISSN:2162-2027
DOI:10.1109/ICIMW.2009.5324648