Experimental investigation of radiation from the interaction of an electron beam and a conducting grating

Abstract

Recent experimental results on the radiation generated from an electron beam passing closely over a conducting grating are presented. The most striking results are that the output power is 4 orders of magnitude more intense than that predicted by the Smith-Purcell explanation and that the output power increases exponentially with the beam thickness until it saturates at a thickness of a 1000 times the grating period. The recent theoretical model of Chang and McDaniel [Phys. Rev. Lett. 63, 1066 (1989); J. Opt. Soc. Am. B 7, 239 (1990)] is shown to compare favorably with these results.

Free-Electron-Driven Multi-Frequency Terahertz Radiation on a Super-Grating Structure

“…The relation between the radiation direction and frequency can be obtained according to the wave vector matching method as shown in (3) (see appendix B), which is identical to the SPR relation [20], [21].…”