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Related Experiment Videos

Millimeter-wave achromatic half-wave plate.

Shaul Hanany1, Johannes Hubmayr, Bradley R Johnson

  • 1School of Physics and Astronomy, University of Minnesota, 116 Church Street, SE, Minneapolis, Minnesota 55455, USA. hanany@physics.umn.edu

Applied Optics
|August 4, 2005
PubMed
Summary

We developed an achromatic half-wave plate (AHWP) for millimeter wavelengths. This sapphire plate stack achieves 96% modulation efficiency, significantly improving upon single plates for astrophysical polarimetry.

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Area of Science:

  • Optics and Photonics
  • Astrophysical Instrumentation
  • Materials Science

Background:

  • Millimeter-wave astronomy requires precise polarization measurements.
  • Existing wave plates often suffer from chromatic aberrations, limiting broadband applications.
  • Sapphire is a suitable birefringent material for millimeter wavelengths.

Purpose of the Study:

  • To design and construct an achromatic half-wave plate (AHWP) for the millimeter wavelength band.
  • To evaluate the performance of the AHWP in terms of modulation efficiency.
  • To assess the AHWP's suitability for astrophysical broadband polarimetry.

Main Methods:

  • Constructed an AHWP using a stack of three a-cut sapphire plates.
  • Rotated the optical axis of the middle plate by 50.5 degrees relative to the outer plates.

Related Experiment Videos

  • Measured modulation efficiency at 110 GHz and analyzed its dependence on incidence angle.

    • Main Results:

    • Achieved a measured modulation efficiency of 96 ± 1.5% at 110 GHz.
    • Demonstrated significantly higher efficiency compared to a single sapphire plate (43 ± 4%).
    • Observed constant modulation efficiency for incidence angles from 0 to 15 degrees.

    Conclusions:

    • The constructed sapphire AHWP effectively corrects for chromatic aberrations in the millimeter band.
    • The high and stable modulation efficiency makes it ideal for broadband astrophysical polarimetry.
    • The design principles discussed are crucial for future millimeter-wave polarimetric instrument development.