THz Radiaticn Source Through Periodically Modulated Structures
Final rept. Nov 96-Feb 99
TECHNISCHE UNIV VIENNA (AUSTRIA) INST FUER FESTKOERPERELEKTRONIK
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The main goal of the project was to investigate various possible mechanism for coherent THz radiation sources based on semiconductor devices A novel concept considers the occurrence of a current driven plasma instability CDPI in a confined plasma. In this case tunnel injection can be used to achieve an inverted electron distribution by injecting carriers selectively into higher quantum well states and maintaining an efficient extraction scheme. In this project we have demonstrated for the first time that these injection-extraction structures can be realized by MBE growth and characterized by transport experiments. Two types of structures have been processes into ridge like mesa structures which have demonstrated for the first time THz emission the energy of the confined plasmon. The observation of electrically excited plasmon emission from parabolic quantum well up to temperatures close to room temperature is milestone for further work. It demonstrates the stability of the plasmon oscillation process and its potential for practical radiation sources. Bunching of electrons has been achieved by the localization of electrons in Bloch oscillations, which is another concept towards the realization of coherent THz emission.
- Electrical and Electronic Equipment
- Plasma Physics and Magnetohydrodynamics
- Quantum Theory and Relativity