Improvement in the properties of glassy-carbon field-emission cells in forming spikes with a high aspect ratio via laser milling

Various opportunities to improve the quality with which an electron flow is formed by cathode arrays comprising multilayer planar structures with the vertical arrangement of autoemitters are investigated with the help of numerical simulation. It is demonstrated that field-emission cells with glassy carbon emitters shaped as smooth needles with aspect ratios of several hundreds and cathode arrays on their basis can be obtained using the efficient technology of microsized milling by laser radiation with nanosecond pulses. Field-emission cells with a vertically oriented ring blade-shaped emitter and emitters created by single spikes located on a circumference are comparatively analyzed.