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We developed a broadband-tunable terahertz circular polarizer for magneto-optical measurements. This device enables rapid switching between left- and right-handed polarization states for advanced THz spectroscopy.

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Area of Science:

  • Terahertz (THz) Science and Technology
  • Optics and Photonics
  • Condensed Matter Physics

Background:

  • Magneto-optical measurements require precise control of light polarization.
  • Existing circular polarizers may lack broadband tunability or rapid switching capabilities.
  • Terahertz spectroscopy offers unique insights into material properties.

Purpose of the Study:

  • To design, construct, and test a broadband-tunable terahertz circular polarizer.
  • To enable efficient magneto-optical measurements in the terahertz range.
  • To develop a versatile polarization control method for THz applications.

Main Methods:

  • Utilized a wire-grid polarizer combined with a parallel translation mirror for tunable retardance.
  • Employed phase-sensitive detection with a lock-in amplifier and rotating analyzer.
  • Tested the device with a far-infrared/THz laser source (0.25–7.5 THz).

Main Results:

  • Achieved broadband tunability across 0.25–7.5 THz.
  • Demonstrated rapid switching between left- and right-handed circular polarization states (seconds).
  • Successfully applied the polarizer to probe magneto-optical properties of a 2D electron gas.

Conclusions:

  • The developed terahertz circular polarizer is effective for broadband magneto-optical measurements.
  • The phase-sensitive detection method offers robustness, even with imprecise component positioning.
  • This technology advances THz spectroscopy for condensed matter research.