Nanjing University Basic Principle Considering the plasmon frequency &(o)=1-0 ⊙ 01 i=ve, wave vector >op,n is real =p 0=0p,n=0 o<op,n is imaginary Plasma frequency 1.0 Optical reflectivity 0.8 0.6 0.4 (n+1)2+K2 0.2 0.0 0 /p Dieletrie Superlantice Laboratory Nat.Lab.Microstructures Dr.Tao Li taoli@nju.edu.cnNanjing University Considering the plasmon 2 2 () 1 ωP ε ω ω = − , r p n ε ω ω = > % n is real , , p p ω ω ω ω = < Plasma frequency n=0 n is imaginary Optical reflectivity 1 ( 1) ~ 2 2 2 + κ . ( 1) ( 1) 1 ~ 1 2 2 + + κ − + κ = + − = n n n n R Dielectric Superlattice Laboratory Nat. Lab. Microstructures Dr. Tao Li taoli@nju.edu.cn