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Excitation of surface plasmons

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(1)

Excitation of surface plasmons

0

( ) ( )

m d

sp sp

m d

k n k

c

   

  

        

p

d 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

2p

bp bp

k n k

c

 

        

2

( )

2 p

m

i

   

 

(2)

Excitation of surface plasmons

(3)

n

h

(4)
(5)
(6)
(7)
(8)

 

r( ) 2 2p 2 2p 2 i 3 2p 2

i

   

     

     

   

          

Note: R does to zero at resonance when   

i rad

(9)
(10)

//,d

sp

kkmG

d metal

//,d d

sin

d

sin

k k

c

   

 

d d

c k

//,

sp d

kkmG

//,d d

sin

kk

k

d

G

k

sp

(11)
(12)
(13)
(14)

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