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Low temperature and high magnetic field spectroscopic ellipsometry system.

Sheng-Kai Su1, Liang-Chen Li2, Yuen-Wuu Suen3

  • 1Department of Electronics Engineering and Institute of Electronics, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan.

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Summary

We developed a new spectral ellipsometer for near-infrared wavelengths, capable of operating in high magnetic fields and low temperatures. This instrument enables detailed studies of magneto-optical responses in materials.

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Area of Science:

  • Condensed Matter Physics
  • Optical Spectroscopy
  • Materials Science

Background:

  • Ellipsometry is a powerful technique for characterizing material optical properties.
  • Studying materials under extreme conditions (high magnetic fields, low temperatures) is crucial for understanding fundamental physics and developing new technologies.
  • Existing systems may have limitations in spectral range, magnetic field strength, or temperature control.

Purpose of the Study:

  • To design and implement a novel spectral ellipsometer for near-infrared wavelengths.
  • To enable measurements on samples subjected to high magnetic fields (up to 14 T) and low temperatures (~4.2 K).
  • To investigate the magneto-optical response of materials, including exciton transitions.

Main Methods:

  • A spectral ellipsometer was designed with optical components integrated into a probe for insertion into a helium dewar.
  • A polarizer-sample-(quarter-wave plate)-rotating analyzer configuration was used.
  • Dielectric mirrors and a piezo-driven goniometer facilitated light reflection and precise sample positioning.

Main Results:

  • The system successfully obtained simultaneous amplitude and phase ellipsometric spectra.
  • Helicity transformation near GaAs exciton transitions was observed in the phase spectra.
  • Significant magnetic field-induced shifts in these transitions were measured and modeled.

Conclusions:

  • The developed spectral ellipsometer is functional and accurate for near-infrared measurements under high magnetic fields and low temperatures.
  • The system allows for simultaneous acquisition of amplitude and phase data, revealing subtle optical phenomena.
  • This instrument is suitable for studying collective magneto-optical responses and exciton-polariton dynamics.