Biomedical Engineering Reference
In-Depth Information
Figure 8.5
Shared circulating powerflow of the even SPP mode in a MIM
plasmon slot waveguide. (a) Schematic of the MIM waveguide and the
coordinate system. (b) The dispersion characteristics of the SPP modes
supported by the structure in (a). The red curve is the dispersion branch
corresponding to the even mode. (c,d) The electric (c) and magnetic field
componentsoftheevenSPPmode.(e)Thetime-averagedopticalpowerflow
in the MIM waveguide. (f) The corresponding instantaneous powerflow at
t
=
=
×
10
15
rads.
0. All field distributions were calculated at
w
4.974
are plotted in Figs. 8.4b and 8.5b. The dispersion characteristics
are obtained by solving the matrix equation with the appropriate
boundary conditions on both metal-dielectric interfaces:
k
2
ε
1
k
1
ε
2
Oddmode : tanh(
k
1
a
)
=−
(8.8)
k
1
ε
2
k
2
ε
1
Evenmode : tanh(
k
1
a
)
=−
(8.9)
Dispersion relations (8.8) and (8.9) correspond to the modes
with tangential electric field distributions that are either symmetric
