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Related Experiment Video

Updated: Jun 13, 2026

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Prism-coupled Cherenkov phase-matched terahertz wave generation using a DAST crystal.

Koji Suizu1, Takayuki Shibuya, Hirohisa Uchida

  • 1Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan. suizu@nuee.nagoya-u.ac.jp

Optics Express
|April 15, 2010
PubMed
Summary

A new prism-coupled Cherenkov phase-matching (PCC-PM) method enables efficient terahertz (THz) wave generation. This technique overcomes crystal absorption limitations, allowing tunable THz-wave sources with various nonlinear crystals.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Quantum Electronics

Background:

  • Terahertz (THz) wave generation via nonlinear frequency conversion is crucial for high-power sources.
  • Strong THz absorption in nonlinear crystals limits efficiency and tunability.
  • Cherenkov phase-matching is a promising technique to overcome these limitations.

Purpose of the Study:

  • To propose and demonstrate a novel prism-coupled Cherenkov phase-matching (PCC-PM) method for THz-wave generation.
  • To overcome the limitations of crystal absorption and phase-matching conditions in THz-wave emitters.
  • To enable the use of a wider range of nonlinear crystals and pump sources for THz generation.

Main Methods:

  • Development of the prism-coupled Cherenkov phase-matching (PCC-PM) technique.

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  • Coupling a prism with suitable refractive index to a nonlinear crystal.
  • Demonstration using the organic crystal 4-dimethylamino-N-metyl-4-stilbazolium tosylate (DAST) and a silicon (Si) prism coupler.

    • Main Results:

    • Successful THz-wave generation using the PCC-PM method.
    • Achieved tunable THz-wave radiation from 0.1 to 10 THz.
    • Observed no significant absorption features from the nonlinear crystal.
    • Demonstrated pump wavelength independence (1300-1450 nm) for THz spectra.

    Conclusions:

    • The PCC-PM method effectively overcomes crystal absorption issues in THz-wave generation.
    • This technique allows for efficient and widely tunable THz radiation.
    • The method shows promise for broad applicability with various nonlinear crystals and pump sources.