Print Email Facebook Twitter Terahertz generation from graphite Title Terahertz generation from graphite Author Ramakrishnan, G. Chakkittakandy, R. Planken, P.C.M. Faculty Applied Sciences Department Imaging Science and Technology Date 2009-08-26 Abstract Generation of subpicosecond terahertz pulses is observed when graphite surfaces are illuminated with femtosecond near-infrared laser pulses. The nonlinear optical generation of THz pulses from graphite is unexpected since, in principle, the material possesses a centre of inversion symmetry. Experiments with highly oriented pyrolytic graphite crystals suggest that the THz radiation is generated by a transient photocurrent in a direction normal to the graphene planes, along the c-axis of the crystal. This is supported by magnetic-field induced changes in the THz electric-field polarization, and consequently, the direction of the photocurrent. We show that other forms of graphite, such as a pencil drawing on paper, are also capable of emitting THz pulses. Subject optical propertiesspectroscopyfar infraredspectroscopyteraherzultrafast phenomena To reference this document use: http://resolver.tudelft.nl/uuid:c0d70419-230e-4f71-9861-8c16386a4111 DOI https://doi.org/10.1364/OE.17.016092 Publisher Optical Society of America ISSN 1094-4087 Source http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-18-16092 Source Optics Express, 17 (18), 2009 Part of collection Institutional Repository Document type journal article Rights (c) 2009 Optical Society of America Files PDF Planken_2009.pdf 230.59 KB Close viewer /islandora/object/uuid:c0d70419-230e-4f71-9861-8c16386a4111/datastream/OBJ/view