3. Examples of components and functions
3.1 Photomixing for the generation of modulated THz signals
Photomixing is the technique of coupling two optical waves of different frequencies in a photodetector.
For example, if we illuminate a photo-mixer with two infrared lasers (e.g. 1,550.12 nm and 1,553.32 nm, giving 193.0 THz and 193.4 THz respectively), we'll create, among the current components in the photodiode, a current oscillating at 193.4 – 193.0 = 0.4 THz = 400 GHz. This current can then be radiated, if required, by an antenna matched to this frequency.
The difficulty lies in the design of the photomixing component, which must have an extremely high bandwidth. Photomixing components include photo-conductors and photodiodes. In the...
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Examples of components and functions
THz transmission links
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