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Related Experiment Video

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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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Published on: July 12, 2017

Second-harmonic generation induced by electric currents in GaAs.

Brian A Ruzicka1, Lalani K Werake, Guowei Xu

  • 1Department of Physics and Astronomy, The University of Kansas, Lawrence, Kansas 66045, USA.

Physical Review Letters
|March 10, 2012
PubMed
Summary
This summary is machine-generated.

Researchers discovered a new nonlinear optical effect where electric currents induce second-harmonic generation in GaAs crystals. This finding enables ultrafast, noninvasive current imaging and electrical control of optical properties.

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Published on: December 3, 2013

Area of Science:

  • Nonlinear Optics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Electric currents are fundamental to electronic devices.
  • Optical methods for current characterization are limited in speed and invasiveness.
  • Gallium Arsenide (GaAs) is a key semiconductor material.

Purpose of the Study:

  • To demonstrate a novel nonlinear optical effect linking electric currents and second-harmonic generation (SHG).
  • To explore the potential of this effect for current imaging and optical control.
  • To establish the relationship between current density and induced nonlinear susceptibility.

Main Methods:

  • Generating steady currents in doped GaAs by voltage application.
  • Inducing transient currents in undoped GaAs via ultrafast laser pulses.
  • Measuring the induced second-harmonic generation (SHG) of a probe laser pulse.

Main Results:

  • Demonstrated that both steady and transient electric currents induce SHG in GaAs.
  • Established that the induced second-order nonlinear susceptibility is directly proportional to current density.
  • Achieved real-time imaging of coherent plasma oscillations and spatial current distribution.

Conclusions:

  • A new nonlinear optical effect of electric currents has been discovered.
  • This effect offers a pathway for nondestructive, noninvasive, and ultrafast current imaging.
  • The phenomenon provides a mechanism for electrical control over the optical response of materials.