期刊
OPTICS EXPRESS
卷 17, 期 18, 页码 16092-16099出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.17.016092
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- Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)
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. (C) 2009 Optical Society of America
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