Excitation of surface plasmons
0
( ) ( )
m d
sp sp
m d
k n k
c
pd p
1
Re k
real kx real kz
imaginary kx real kz
real kx
imaginary kz
0 d
c k
Bound modes Radiative modes
Quasi-bound modes
Dielectric: d
Metal: x m = m'+ m"
z
'm > 0)
d < 'm < 0)
('m < d)
2 2 2 2
p c kbp
2
0
1
2pbp bp
k n k
c
2( )
2 pm
i
Excitation of surface plasmons
n
h
r( ) 2 2p 2 2p 2 i 3 2p 2i
Note: R does to zero at resonance when
i rad//,d
spk k mG
d metal
//,d d
sin
dsin
k k
c
d d
c k
//,
sp d
k k mG
//,d d