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Updated: Jun 19, 2026

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Light-induced terahertz optical activity.

Natsuki Kanda1, Kuniaki Konishi, Makoto Kuwata-Gonokami

  • 1Department of Applied Physics, University of Tokyo and Core Research for Evolutional Science and Technology (CREST), 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

Optics Letters
|October 2, 2009
PubMed
Summary

We demonstrate a simple method to induce terahertz (THz) optical activity in semiconductors using photoexcited carriers and chiral masks. This technique enables THz polarization modulation for various scientific applications.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Semiconductor Physics

Background:

  • Chirality is crucial for understanding light-matter interactions.
  • Terahertz (THz) spectroscopy offers unique insights into material properties.
  • Inducing optical activity in the THz region remains a challenge.

Purpose of the Study:

  • To develop a novel method for inducing optical activity in the terahertz (THz) region.
  • To explore the use of photoexcited carriers and chiral nanostructures for THz polarization control.
  • To enable new THz polarization modulation techniques for diverse scientific fields.

Main Methods:

  • Fabrication of two-dimensional chiral metal masks on semiconductor substrates.
  • Photoexcitation of charge carriers within the semiconductor.

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  • Measurement of optical activity in the THz spectrum.

    • Main Results:

    • Demonstrated photoinducible optical activity in the THz range.
    • Attributed the induced activity to three-dimensional chirality from combined photocarriers and mask.
    • Confirmed the absence of optical activity without photoexcitation.

    Conclusions:

    • The proposed method offers a simple and effective way to achieve THz optical activity.
    • This technique paves the way for advanced THz polarization modulation.
    • Potential applications span biology, chemistry, and material sciences.