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THZ光导天线

PCA - Photoconductive antenna for Terahertz waves
-> see poster "Photoconductive antenna" (pdf) and "Photomixing" (pdf)
 
PCA product list  
  Wavelength region   530 nm ... 860 nm:   800 nm  
  Wavelength region   800 nm ... 1100 nm: 1060 nm  
  Wavelength region   1000 nm ... 1550 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 the resonance 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 silicon substrate lens to 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 array converts high power laser pulses up to mean power levels of 5 W with a high power conversion efficiency of ~ 10-4 into 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 antenna emitter detector broadband high power
PCA1 - butterfly antenna + ++ + +
PCA2 - parallel line antenna ++ + ++ -
PCA3 - bow-tie antenna + ++ + +
iPCA - large area interdigital antenna ++ + ++ ++

 


参考文献:

用飞秒激光触发GaAs光电导体产生THz电磁波的研究

报道了用半绝缘GaAs材料研制的光电导偶极天线在飞秒激光脉冲触发下辐射THz电磁波的实验结果.GaAs光电导偶极芯片的两个欧姆接触电极间隙为3mm,采用Si3N4薄膜绝缘保护,在540V直流偏置下被波长800nm,脉宽14fs,重复频率75MHz,平均功率130mW的飞秒激光脉冲触发时产生THz电磁波.用电光取样测量得到了THz电磁脉冲的时域波形和频谱分布.THz电磁波的辐射峰值位于0.5THz左右,频谱宽度大于2THz,脉冲宽度约为1ps.

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