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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

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Terahertz generation from graphite.

Gopakumar Ramakrishnan¹, Reshmi Chakkittakandy, Paul C M Planken

¹Optics Research Group, Department of Imaging Science and Technology, Faculty of Applied SciencesDelft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands. G.Ramakrishnan@tudelft.nl

|September 3, 2009

Summary

This summary is machine-generated.

Researchers observed subpicosecond terahertz (THz) pulse generation from graphite using femtosecond lasers. This unexpected nonlinear optical effect is attributed to a transient photocurrent along the crystal

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Area of Science:

Nonlinear Optics
Condensed Matter Physics
Materials Science

Background:

Graphite's centrosymmetric structure typically precludes nonlinear optical effects.
Terahertz (THz) pulse generation is crucial for various spectroscopic and imaging applications.

Purpose of the Study:

Investigate the unexpected generation of THz pulses from graphite.
Elucidate the underlying mechanism of THz radiation from graphite surfaces.

Main Methods:

Illumination of graphite surfaces with femtosecond near-infrared laser pulses.
Experimental analysis using highly oriented pyrolytic graphite crystals.
Investigation of magnetic-field induced changes in THz electric-field polarization.

Main Results:

Observed generation of subpicosecond THz pulses from graphite.
Identified transient photocurrent along the c-axis (normal to graphene planes) as the generation mechanism.
Demonstrated THz emission from various graphite forms, including pencil drawings.

Conclusions:

The study reveals a novel pathway for THz pulse generation in graphite.
Transient photocurrent is the primary mechanism, despite graphite's inversion symmetry.
This finding broadens the scope of materials for THz generation.