Abstract:
Electromagnetic radiation in the terahertz frequency range, occupying the spectral region between optical infrared and microwave radiation, is of interest for numerous diagnostic applications in various fields of science and technology. To build terahertz diagnostic systems, various types of radiation sources are required. This review considers schemes for the generation of terahertz radiation in semiconductors and semiconductor structures based both on quantum optical transitions between different energy levels in the system and generation schemes not directly related to quantum transitions, which can be attributed to classical schemes.
Keywords:optical transitions, lasers, light-emitting diodes, ultrashort optical pulses, fast dipole moment, fast photocurrent.
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