Nanjing University 体等离激元的光学性质 介质的光学性质的重要表征折射率系数n,消光系数K 复数介电函数 ()=81+i82 8,=n2-K2,62=2nK and "-店G++)时 K=万(6+(e2+)月 n and E.are not independent Dielectric Superlattice Laboratory Nat.Lab.Microstructures Dr.Tao Li taoli@nju.edu.cn
Nanjing University 介质的光学性质的重要表征折射率系数n, 消光系数κ 1 2 复数介电函数 ε( ) ωε ε = +i 2 2 1 2 n n , 2 and ε κε κ =− = 1 1 2 2 2 2 1 12 1 ( ( )) 2 and n = ++ ε εε 1 1 2 2 2 2 1 12 2 1 ( ( )). 2 κ ε εε = −+ + 1 12 r n and are not independent % ε% Dielectric Superlattice Laboratory Nat. Lab. Microstructures Dr. Tao Li taoli@nju.edu.cn
Nanjing University 根据Drude模型 frequency (0)=1- 0 方=E, wave vector n is imaginary for o<op -@p positive for o>ap zero for @=@p Plasma frequency 1.0 金属的反射率 0.8 0.6 0.4 + R= 0.2 0.0 0 @ Dielectrie Superlattice Laboratory Nat.Lab.Microstructures Dr.Tao Li taoli@nju.edu.cn
Nanjing University 根据Drude模型 2 ω r n % = ε 2 () 1 ωP ε ω ω = − r p n is imaginary for positive for ω ω ω ω < > % p p positive for zero for ω ω ω ω > = Plasma frequency 金属的反射率 2 . 1 ~ 1 ~ 2 + − = n n R Dielectric Superlattice Laboratory Nat. Lab. Microstructures Dr. Tao Li taoli@nju.edu.cn