Modulation of Infrared by Free Carrier Absorption
- 1 April 1964
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 35 (4), 1243-1248
- https://doi.org/10.1063/1.1713602
Abstract
The phenomenon of free carrier absorption in germanium has been utilized to modulate infrared radiation. Criteria are established which provide bases for judging and comparing modulator performance. By solving the small‐signal continuity equation for the spatial and temporal distribution of excess holes, expressions are obtained which relate the modulator performance to the fundamental electro‐optical properties of the modulator material. Modulators have been fabricated having modulation bandwidths in the range 105 to 106 cps. Experimentally determined modulator characteristics are compared with theoretical predictions.Keywords
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