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Tunable cavity-enhanced terahertz frequency-domain optical Hall effect.

Sean Knight1, Stefan Schöche2, Philipp Kühne3

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A new tunable cavity-enhanced terahertz optical Hall effect technique boosts signal detection. This method enhances optical signatures for analyzing free charge carrier properties in thin films without superconducting magnets.

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Area of Science:

  • Terahertz (THz) spectroscopy
  • Condensed matter physics
  • Optical metrology

Background:

  • The optical Hall effect (OHE) is crucial for characterizing conductive materials.
  • Enhancing OHE signal detection is vital for precise analysis of thin films.
  • Existing methods often require complex or expensive equipment, such as superconducting magnets.

Purpose of the Study:

  • To develop and demonstrate a tunable cavity-enhanced terahertz frequency-domain optical Hall effect (OHE) technique.
  • To enhance the optical signatures produced by the OHE in semi-transparent conductive layers.
  • To enable efficient extraction of free charge carrier properties without superconducting magnets.

Main Methods:

  • Utilized a tunable Fabry-Pérot resonator cavity, including at least one fixed and one tunable resonator.
  • Employed cavity tuning, specifically adjusting external cavity thickness, to shift constructive interference frequencies.
  • Integrated permanent magnets for the external magnetic field and as a reflective surface for the tunable cavity.

Main Results:

  • Achieved substantial enhancement of OHE optical signatures in conductive layer structures.
  • Demonstrated signal enhancement exceeding one order of magnitude for specific polarization components.
  • Successfully studied high electron mobility transistor (HEMT) structures and epitaxial graphene.

Conclusions:

  • The tunable cavity-enhanced THz-OHE technique significantly improves signal detection.
  • This method provides an independent measurement condition through external cavity thickness.
  • The technique offers a cost-effective alternative for characterizing free charge carrier properties in thin films.