| Outline of Final Research Achievements |
The purpose of this study was to clarify the role of excitons in the generation of terahertz electromagnetic waves by difference frequency mixing using excitons in semiconductors. The semiconductor samples were fabricated at the University of Glasgow, which is an international collaborator, and optical measurements, including observation of terahertz electromagnetic waves, were performed at Kobe University. From the experimental results obtained by the modulation spectroscopy, the second harmonic generation using the ultrashort pulse, and so on, the effects of resonant excitation of a single exciton level could be clarified. On the other hand, the effect of excitation of two exciton levels is still unknown. This point will be clarified in future research.
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