Optical anisotropy of highly oriented pyrolytic graphite. Effect of surface preparation

Zanini, Margherita; Grubisic, D.; Fischer, J. E.

doi:10.1002/pssb.2220900116

Cited by 24 publications

(4 citation statements)

References 17 publications

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“…As mentioned earlier, a possible underlying mechanism for the generation of THz radiation is a transient charge movement along the c-axis of the crystal. The conductivity of graphite along the c-axis is known to be at least three orders of magnitude smaller than the conductivity along the graphene planes [2][3][4][5]. A preferred charge movement along the c-axis, following an ultrafast excitation of graphite, has not been reported in literature to our knowledge.…”

Section: Edge-plane Surface Illuminationmentioning

confidence: 99%

“…Different graphene planes in graphite are attached to each other by weak van der Waals forces. Thermal, electrical and optical properties of graphite parallel and perpendicular to these graphene layers are known to be different [2,3]. This peculiar structure gives graphite unique qualities which are widely made use of in its different applications [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Terahertz generation from graphite

2009

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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.

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Section: Edge-plane Surface Illuminationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Terahertz generation from graphite

2009

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“…From direct measurements of the reflectivity for light polarized along the c-axis, Venghaus [13] obtained the value e = 5.4. This value has been recently contested by Zanini et al [14] who established that e is lower than 3.2.…”

mentioning

confidence: 95%

Band structure model and electrostatic effects in third and fourth stages of graphite acceptor compounds

Blinowski

Rigaux

1980

J. Phys. France

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The model of independent graphite subsystems is extended to describe the electronic states in stages 3 and 4 of GAC. The electrostatic effects related to the nonequivalence of the internal and external graphite layers are proved to induce a non uniform charge distribution in the system, and also to modify drastically the band structure. Interband optical transitions are analysed within this model. With a charge transfer coefficient comparable to the value obtained for lowest stages of GAC, the expected energies of the intervalence transitions are close to the energies of the reflectivity structures observed experimentally

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“…HOPG exhibits an anisotropy similar to graphite and is cleavable. Because of the anisotropy, many of its physical properties, including thermal, electrical, and optical properties [46], are different in different directions, as for example, along and perpendicular to the basal plane (Table 1.1). HOPG normally shows weak ferromagnetism due to the presence of magnetic impurities associated with the HOPG synthesis process.…”

Section: Hopgmentioning

confidence: 99%