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Generation of terahertz radiation by mixing fundamental and second harmonic light in laser generated plasmas is very promising for nonlinear spectroscopy and remote sensing applications. The exact origin of this very intense THz light is still not yet fully understood. Currently, there are two models being discussed in literature, namely a four-wave mixing, and a microscopic polarization model. This...
The generation of terahertz radiation within subwavelength waveguides is studied in time- and frequency-domain. Such waveguide emitters enable the efficient launching of terahertz waves within compact terahertz optical systems.
Terahertz (THz) waveguide emitters are presented as an alternative to conventional THz generation using, e.g. a photoconductive switch. Especially their ability to launch THz waves in subwavelength size waveguides is studied and the emitters are demonstrated to be useful THz sources to explore nanofabricated devices such as microcavity quantum cascade lasers.
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