Design of carbon nanotube cold cathode electro-optical system with mesh grid structure

Carbon nanotube (CNT) which has excellent field emission characteristics can be an ideal cathode material for the field emission devices. Based on experimental test results, the field emission properties of large area carbon nanotube cold cathode are investigated using the three dimensional PIC simulation software. The impact on field emission characteristic and the pass rate of electron beam with different dimensions of planar mesh grid structure are studied. On this basis of optimized mesh grid structure, a sheet beam electron gun with carbon nanotube cold cathode is designed, whose compression ratio of area is 18 and the output current density is 14.9 A/cm2.