The terahertz range is one of the last sections of the electromagnetic spectrum – which extends from radio waves through optical applications right up to X-ray radiation – that is still rarely used in everyday life. The radiation is difficult to generate and until now this was only possible to a limited extent. Yet it has the potential for numerous applications.
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Ref: Tunable Circularly Polarized Terahertz Radiation from Magnetized Gas Plasma. Physical Review Letters (2015) | DOI: 10.1103/PhysRevLett.114.253901