Objective
The purpose of this project is to provide the physical background for developing new receiving techniques in millimetre (MM) and submillimetre (SMM) wavelength range suitable for radioastronomy, laser diagnostic, and environmental research. The phenomena to be used are Bloch oscillations in short-period semiconducting superlattices and non-equilibrium quasi-particle photoresponse of superconducting films. Detection and mixing of MM and SMM radiation with semiconducting Esaki-Tsu superlattices and with thin structured low- and high-temperature superconducting films as well as the possibility to generate MM electromagnetic radiation by means of negative differential effect due to Bloch oscillations in superlattices will be investigated.
Due to extensive experience in molecular beam epitaxy growth of short-period semiconducting superlattices the team from St. Petersburg will provide a reliable technological basis for the semiconducting part of the project. It will be accompanied with microstructuring and MM wave characterization techniques highly developed in Nizhny Novgorod. Superconducting films of high quality will be produced in Regensburg and will be structured in Moscow. A theoretical basis for studying dc and transient characteristics of superlattices will be developed in Regensburg. The Moscow group is well experienced in the study and applications of fast non-equilibrium kinetic phenomena in thin superconducting films. This team will aim to work on the SMM mixing experiments and the characterization of superconducting films.
Finally, the high level of Regensburg and Pisa groups in terahertz spectroscopy and also in generation and detection of picosecond terahertz radiation pulses will allow the capabilities of several laboratories to be concentrated on a topic of actuality in the field of both basic and applied research and to achieve the following goals: to determine the spectral dependence of the response to terahertz radiation of short-period semiconducting superlattices; to increase the generation efficiency at MM wavelengths and the frequency band of Esaki-Tsu semiconducting oscillators; and to obtain experimentally the performance of a superconducting film mixer.
Fields of science (EuroSciVoc)
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Programme(s)
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Topic(s)
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Funding Scheme
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Coordinator
93053 Regensburg
Germany
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