BATOP GmbH was founded in 2003 and is a private innovative company affiliated with the University of Jena in Germany. BATOP's professional fields include low-temperature molecular beam epitaxy technology, dielectric sputtering coating, wafer processing, and chip installation technology. In the past few years, BATOP has become a world leading supplier of saturable absorbers for passive mode-locked lasers. Saturated absorption products combine a variety of different devices, fromSaturated Absorption Mirror (SAM) ™), toSaturated output mirror (SOC)And for use through applicationsSaturated Absorbent (SA)So far, saturable absorption products have covered the commonly used laser wavelength range of 800nm to 2.6 µ m. Another product series is used for terahertz emission and detectionTerahertz photoconductive antenna (PCA)BATOP not only provides single bandgap antennas, but also includes high-energy large slit cross antenna arrays integrated with microlenses and a complete terahertz spectrometer. The excitation wavelength of terahertz photoconductive antenna is between 800nm and 1550nm. BATOP leverages its strong research and development capabilities to continuously improve its products, and we are always with our customers to best meet their needs.

PCA - Photoconductive antenna for Terahertz waves

-> see poster:"PCA survey" (2 MB)(pdf),"Photomixing"(pdf)"THz antenna mounting options"(pdf),

PCA product list

Wavelength region 530 nm ... 860 nm:

Wavelength region 800 nm ... 1100 nm:

Wavelength region 1000 nm ... 1550 nm:

PCA - Photoconductive antenna as terahertz transmitter

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 electrical contacts of the transmitter antenna 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 theresonance condition. The gap of the transmitter antenna between the metallic contacts can be larger than the laser spot diameter.
The PCA can be accomplished with a hyperhemispherical or an aspheric siliconsubstrate lensto increase the extraction efficiency for THz waves.

PCA terahertz receiver
The PCA receiver has the same design as the transmitter. The optimal gap between the metallic contacts is about equal to the laser spot diameter. A current amplifier connected to the antenna contacts delivers a signal proportional to the terahertz electric field strength.

iPCA - large area interdigital photoconductive antenna
The iPCA is designated as high power THz transmitter, but can be used also as sensitive large area THz receiver. The interdigital antenna with a proprietary lens arrayconverts high power laser pulses up to mean power levels of 5 W with a high power conversion efficiency of ~ 10^-4into broadband THz pulses. More about iPCA ...

Trademark iPCA ™
iPCA is a trademark of BATOP GmbH registered under the number 30 2008 027 538 at the Deutsches Patent- und Markenamt in Germany.

Recommended use of PCAs

Type of antennaemitterdetectorlow THz frequenyhigh THz frequenylow optical powerhigh optical power PCA1 - butterfly antenna + ++ ++ - - + PCA2 - parallel line antenna ++ + - ++ + - PCA3 - bow-tie antenna + ++ + + + - iPCA - large area interdigital array ++ ++ - ++ - ++ PCA - finger gap antenna + + + + ++ - SPCA - logarithmic spiral antenna ++ ++ ++ - + -

http://www.batop.de/products/terahertz/photoconductive-antenna/photoconductive-terahertz-antenna.html

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