The temperature-dependent spectral properties of filter substrate materials in the far-infrared (6–40 μm)

  • Gary Hawkins, Roger Hunneman
  • Infrared Physics & Technology, January 2004, Elsevier
  • DOI: 10.1016/s1350-4495(03)00180-4

Infrared Filter Material Properties

What is it about?

This paper presents the experimental results on the low temperature absorption and dispersion properties for a variety of frequently used infrared filter substrate materials.

Why is it important?

It is a necessary requirement in infrared radiometry and spectrometry to have effective and precise filtering for the elimination of unwanted broadband radiation. Detailed knowledge of the temperature dependent spectral characteristics of both the layer and substrate materials is therefore clearly necessary for the successful design and fabrication of high performance filters for use at cryogenic temperatures.


Dr Gary J Hawkins
University of Reading

By combining the absorption calculations with the real part of the refractive index, a complete model of the complex refractive index has been derived and verified for low temperature use (300–50 K) for a selection of differing infrared materials.

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The following have contributed to this page: Dr Gary J Hawkins