Li Hui, Fan Wenhui, Liu Jia. Investigation on terahertz generation by controlling the laser spot size on photoconductive antenna[J]. Infrared and Laser Engineering, 2015, 44(2): 528-533.
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Li Hui, Fan Wenhui, Liu Jia. Investigation on terahertz generation by controlling the laser spot size on photoconductive antenna[J]. Infrared and Laser Engineering, 2015, 44(2): 528-533.
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Investigation on terahertz generation by controlling the laser spot size on photoconductive antenna
- 1.
State Key Laboratory of Transient Optics and Photonics,Xi'an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi'an 710119,China
- Received Date: 2014-06-11
- Rev Recd Date:
2014-07-13
- Publish Date:
2015-02-25
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Abstract
It was experimentally investigated that the laser spot size on photoconductive antenna (PCA) gap could have a great influence on terahertz (THz) generation. Moreover, the simulation on THz generation influenced by the laser power density was carried out, which was agreed well to the experiments. It is well demonstrated that the increase of laser power density on PCA gap can enhance THz generation. However, the intensity of THz radiation reached saturation while the laser power density exceeding a certain value. The laser power density increased further by focusing harder, but the THz radiation was getting weaker due to the smaller laser excited area on PCA gap.
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