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Large tolerance for incidence angle in Terahertz parametric detection.

Hyuga Inoue1, Sota Mine1, Kodo Kawase1

  • 1Department of Electronics, Graduate school of Engineering, Nagoya University, Furocho, Chikusa, Nagoya, 4648603, Japan.

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|July 2, 2025
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Summary
This summary is machine-generated.

Terahertz (THz) wave detection using LiNbO3 crystals does not require strict phase-matching conditions. This discovery allows for a significantly wider range of incidence angles, simplifying THz detection setups.

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Area of Science:

  • Optics and Photonics
  • Terahertz (THz) Science and Technology
  • Nonlinear Optics

Background:

  • Terahertz (THz) parametric detection relies on upconverting THz waves to near-infrared light in LiNbO3 crystals.
  • Conventional methods assume strict non-collinear phase-matching and precise angle control for THz detection.

Purpose of the Study:

  • To investigate the necessity of the non-collinear phase-matching condition for THz wave detection in LiNbO3 crystals.
  • To explore the incidence angle tolerance for THz detection, challenging existing assumptions.

Main Methods:

  • Experimental analysis of THz wave detection in LiNbO3 crystals across various incidence angles.
  • Comparison of incidence angle tolerance for THz generation versus THz detection.

Main Results:

  • THz waves can be detected in LiNbO3 crystals even without satisfying the non-collinear phase-matching condition.
  • A large incidence angle tolerance of approximately 116 degrees was achieved for THz detection, contrasting with the narrow tolerance for THz generation.

Conclusions:

  • The non-collinear phase-matching condition is not strictly required for THz wave detection in LiNbO3.
  • The findings eliminate the need for Si prism couplers and enable simplified optical setups for broader THz applications.