Coherent and tunable radiation with power enhancement from surface plasmon polaritons*
Gong Sen†, Zhong Ren-Bin, Hu Min, Chen Xiao-Xing, Zhang Ping, Zhao Tao, Liu Sheng-Gang
       
The power intensity ratios on the vacuum/film interface of the excited SPPs and the incident waves from e-beam at the SPPs’ operating frequency: (a) dependencies of the power intensity ratio on e-beam energy for SPCLS with 30 nm and 50 nm Ag films; (b) dependence of the power intensity ratio on Ag film thickness for fixed e-beam energy β = 0.5.