Simulation Study of Compact Carbon Nanotube Cold-cathode Oscillator

A compact carbon nanotube cold-cathode oscillator operating at terahertz band is designed by PIC simulation software in this paper. The cathode part is integrated with the high frequency structure. The field emission beam of the cold cathode is modulated by the high frequency field in the high frequency structure directly. The simulation results show that a peak output power of 3.4W is obtained at 140GHz, and the emission current modulation depth is 7.7% when the surface electric field strength of the cathode is 12V/μm.