Terahertz sensing by beryllium and silicon delta-doped GaAs/AlAs quantum wells

Details Terahertz sensing by beryllium and silicon delta-doped GaAs/AlAs quantum wells Terahertz sensing by beryllium and silicon delta-doped GaAs/AlAs quantum wells

2007-11-03

arxiv.org/abs/0711.0460v1

Physics

Condensed Matter

Materials Science

6 pages, 3 figures

Scientific paper

Selective sensing of terahertz (THz) radiation by beryllium and silicon delta-doped GaAs/AlAs multiple quantum wells (MQWs) is demonstrated. A sensitivity up to 0.3 V/W within 0.5{4.2 THz in silicon- and up to 1 V/W within 4.2-7.3 THz range in beryllium-doped MQWs at liquid helium temperatures is shown. The built-in electric fields as estimated from the observed Franz-Keldysh oscillations in photoreflectance spectra were found to be located close to the cap and buffer layers of MQWs and vary from 18 kV/cm up to 49 kV/cm depending on the structure design.

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