Ge:Ga is a widely used detector material for applications at terahertz frequencies. Its response ranges from about 40 /spl mu/m -120 /spl mu/m. If a compressive force is applied to the crystal the response shifts to about 100 /spl mu/m - 240 /spl mu/m. We report on a long wavelength, sub-terahertz response >300 /spl mu/m. This response can be attributed to transitions from excited Ga states into the valence band. The results indicate that a cascade type of relaxation exists in Ge:Ga at 4.5 K.
Sub-terahertz response of stressed and unstressed Ge:Ga photoconductive detectors
2004-01-01
132783 byte
Conference paper
Electronic Resource
English
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