Studies on electron beam devices using a micro emitter

利用碳纳米管制备了微发射器，并对其在毫米波和亚毫米波电子束器件中的应用进行了测试。首先，我们制作了一个环形发射区的发射极。由于碳纳米管细丝的不均匀性，发射极的电子发射被限制在100nA以内。采用控制良好的均匀碳纳米管细丝制备了第二极体。发射电流高达60uA，但在发射中观察到耗散不均匀的发射模式。假定非必要发射的原因是电场的集中和发射区边缘蚁丝的不均匀性。研究了抑制非必要辐射的方法。

Micro emitters using carbon nanotube were fabricated and tested for application to electron beam devices in millimeter and sub-millimeter region. First of all we fabricated an emitter with ring emitting area. The electron emission from the emitter was limited up to 100nA due to ununiformity of cnt filaments. The second emitter was fabricated by using well controlled uniform cnt filamnets. The emission current up to 60uA was obtained, but dissipative ununiform emission patterns were observed in the emission. The cause of unnecessary emission was presumed that the concentration of the electric field and ununiformity of the ant filaments in the edge of the emitting area. The method of suppressing the unnecessary emission was examined.