532 nm激光照射碳纳米管光场致发射电子枪
Electron gun based on photo-field emission of carbon nanotubes irradiated by 532 nm laser
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摘要: 报道了碳纳米管光场致发射电子枪的初步研究结果。在532 nm激光照射下碳纳米管光场致发射电子枪在极间高压为27 kV时得到的最大的脉冲流强可以达到3.364 A，其脉冲电流发射密度可达6.728 A/cm2，对应脉冲电荷量为38.7 nC。碳纳米管的量子效率通过公式计算为3.73×10-5，给出了在532 nm激光照射下碳纳米管光场致发射电子枪发射电流随激光功率和极间电压的变化关系。Abstract: The paper reports the preliminary experiment results of the electron gun based on photo-field emission of carbon nanotubes(CNTs). The quantum efficiency of the CNTs was 3.73×10-5 under the irradiation of the laser with wavelength of 532 nm; the peak pulse current of 3.364 A, corresponding pulse charge of 30 nC were achieved in the experiment. The relation between the photo emission current of the CNTs and the laser power under different high voltage is given.
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Key words:
- electron gun /
- carbon nanotubes /
- photo-field emission /
- quantum efficiency
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