Generation and detection of terahertz pulsed radiation with photoconductive antennas and their application to imaging

  • Tani M
  • Herrmann M
  • Kono S
 et al. 
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We describe the basic properties of photoconductive (PC) antennas as emitters and detectors of
terahertz (THz) pulsed radiation. The efficiency of PC antennas is discussed, taking into account
the saturation effect due to field screening by photo-generated carriers. We show that maximum
emission efficiency under a constant pump power condition is achieved by adjusting the PC gap size
so that the pump intensity (power divided by PC area) is equal to the characteristic saturation
intensity. We also discuss the bandwidth of PC antennas and conclude that PC antennas are capable of
generating and detecting ultra-broad THz radiation beyond 10 THz when short enough laser pulses are
used. Our conclusion is demonstrated experimentally by detecting ultra-broadband THz radiation,
whose spectrum distributed up to 40 THz, with a PC antenna. As an example of applications of THz
pulsed radiation based on a PC emitter-detector system, results for the imaging of objects in
powders are presented and discussed.

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  • M. Tani

  • M. Herrmann

  • S. Kono

  • K. Sakai

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