Biomedical Engineering Reference
In-Depth Information
Figure 14.11
The magnitude of the
θ
-component of the electric field of
the super-resonant spherical Ag-based CNP for (a)
z
-oriented and (b)
x
-
orientedEHDs.ThecorrespondingresultsforthepassiveAg-basedCNPare
found in (c) and (d). The EHD is inside the nano-core at 12 nm along the
positive
x
-axis. The results are shown in the
xy
-plane in a circular region of
aradiusof90nm.ThecurvesrepresentingthesphericalsurfacesoftheCNP
are likewise shown in all figures.
In addition to the above near-field results, we next show the
directivity, as calculated from (14.9), for the Ag-based CNP. This is
shown in Fig. 14.12 for lossless and passive (
κ
=
0) and super-
resonant (
κ
=−
0.245) Ag-based CNP in the case of a
z
-oriented
EHD being located inside the nano-core at 12 nm along the positive
x
-axis. Specifically, the E-plane (
xz
-plane) pattern results are shown
in Fig. 14.12a and the H-plane (
xy
-plane) pattern results are shown
in Fig. 14.12b. Despite the large levels of the NRR reported in Fig.
14.10b, the directivity of the super-resonant state, which is clearly
dipolar, is not enhanced relative to that of an isolated
z
-oriented
