Coherent and tunable radiation with power enhancement from surface plasmon polaritons<xref ref-type="fn" rid="cpb142701fn1">*</xref>

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

(a) The dispersion curves in the radiation region for SPCLS with 50 nm Ag film and 30 nm Ag film. (b) The dependencies of the radiation frequencies on the e-beam energy.