Nanjing University Basic Principle P According to Equations D=E+P,J= Ot We get the dielectric function of metal 8(K.@)-1+io(K.@) 8o0 For a spatially local response,(K=0,)=( From wave equation VxXE= o"D K-c(K) Generic dispersion relation Dielectric Superlattice Laboratory Nat.Lab.Microstructures Dr.Tao Li taoli@nju.edu.cnNanjing University According to Equations ε ∂ =+ = P According to Equations D EP J We get the dielectric function of metal 0 , t =+ = ε ∂ D EP J 0 (,) (,)1 iσ ω ε ω ε ω = + K K 0 For a spatially local response, ε ( 0, ) ( ) K = = ω εω 2 ∂ D From wave equation 0 2 t μ ∂ ∇ ×∇× = − ∂ D E 2 2 ω 2 K (,) c ω = ε K ω Generic dispersion relation Dielectric Superlattice Laboratory Nat. Lab. Microstructures Dr. Tao Li taoli@nju.edu.cn Generic dispersion relation