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Optical Engineering

Far-infrared transmission of diamond structure semiconductor single crystals--silicon and germanium
Author(s): Jason E. Peters; P. Darrell Ownby
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Paper Abstract

The current research demonstrates the effectiveness of silicon as a transmissive material for use within the far infrared wavelength range of 20 to 160 microns. This study involves samples with a wide range of resistivities and temperatures including: n-type Si of 4000, 2000, 160, 65, 12, and 2.6 ohm-cm and p-type Si of 500 and 60 ohm-cm within a temperature range of -100°C to 250°C, as well as n-type Ge of 39, 25, 14.5, 5.0, 2.5, and 0.5 ohm-cm within a temperature range of -100°C to 100°C. Far infrared absorption mechanisms are briefly discussed. The experimental transmission data are used to discuss the interaction between absorption by lattice resonance and free carrier mechanisms. The effect of room temperature resistivity on silicon's far infrared transmission characteristics is shown. The primary free carrier scattering mechanism, at elevated temperature, is shown to be acoustic phonons. Highly resistive silicon is found to be an excellent transmissive material in the far infrared. These results may be used to develop silicon and germanium optical systems in the far infrared range.

Paper Details

Date Published: 1 November 1999
PDF: 8 pages
Opt. Eng. 38(11) doi: 10.1117/1.602242
Published in: Optical Engineering Volume 38, Issue 11
Show Author Affiliations
Jason E. Peters, Univ. of Missouri/Rolla (United States)
P. Darrell Ownby, Univ. of Missouri/Rolla (United States)

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