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Photoconductive THz Antenna
-> see poster "Photoconductive antenna" (pdf) and
"Photomixing" (pdf) |
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| > PCA - Photoconductive antenna as terahertz transmitter | Types of PCA | ||||||||||||||||||||||||||
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A photoconductive antenna, consisting of a low temperature grown GaAs or InGaAs
film covered with metallic contacts can be used as an optical excited broadband
terahertz emitter for time domain measurements or as photomixer. Typically an alternating voltage
is supplied to the contacts to allow a lock-in measurement. There are at least
two important antenna parameters: the length l and the gap distance g. The length
l determines the prefered emitted frequency at the
resonance condition. The gap between the metallic contacts can be larger than
the laser spot diameter.
> PCA terahertz detector
>
iPCA - large area interdigital photoconductive antenna
> Trademark iPCA™ |
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![]() PCA2 Broadband antenna with long parallel metal lines for optical excitation power levels up to ~ 30 mW |
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![]() iPCA Large area interdigital antenna with high power conversion efficiency for optical excitation power levels up to ~ 5 W and high THz output power |
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| > Recommended use of PCAs | |||||||||||||||||||||||||||
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