SPR(表面等离子体共振 )is a collective oscillation of conduction band electrons can not be excited in metal by ordinary plane wave light due to momentum mismatching of the SPR dispersion relation and the excitation light photon。
为什么对于平面波,光子与色散关系什么的不匹配,解释这个就行了(如果可以请帮忙翻译下)。