Biomedical Engineering Reference
In-Depth Information
Figure 9.16
Distribution of the Poynting vector
|
S
|
and singular points for
a nanowire with size parameter q
=
0.1 and
ε
r
=−
1: (a) isotropic cylinder
ε
t
=−
1; (b) and anisotropic ones
ε
t
=−
1.0065, (c)
ε
t
=−
1.0067835, and
(d)
ε
t
=−
1.0071, respectively.
9.7 Concluding Remarks
ScalingoftheFanoresonancesinnanostructureshasbeendiscussed
in a few papers, see for example Refs. [2, 10, 22, 23]. Typically, the
pronouncedFanoresonancecanbeobservedforthestructureswith
the size parameter of the order of unity. In practice, the smallest
experimentally realized plasmonic structures demonstrating Fano
resonances have the characteristic size of 100 nm and above
[10]. A challenge with the Fano resonance scaling has a deep
physical reason related to different resonant frequencies of the
interfering resonances, which lead to a strong suppression of the
Fano resonance for nanostructures with small values of the size
parameter.
Here, we have studied the scaling of the Fano resonance for the
nanostructures with spherical and cylindrical symmetries. We have
