Artificial surface plasmon radiator based on F-P cavity loading and control method

The invention discloses an artificial surface plasmon radiator based on F-P cavity loading and a control method. A metal grating and a Fabry-Perot F-P cavity are used, an electron beam passes throughthe gap between the metal grating and the Fabry-Perot, SSP is excited on the surface of the metal grating, the SSP is amplified through the interaction of SSP and free electron beam-wave interaction,when a power flow reaches a mirror of the F-P cavity, a part of power flow is reflected back into the F-P cavity, the beam-wave interaction continues, the remaining part of the power flow is outputtedfrom the F-P cavity and the metal grating, and the artificial surface plasmon radiator is achieved through a regenerative amplification mechanism. In the present invention, the F-P cavity effectivelyprolongs an interaction distance, and the high interaction efficiency can be obtained in a short interaction circuit, especially in an on-chip terahertz source system with weak electron beam current.The artificial surface plasm