Biomedical Engineering Reference
In-Depth Information
Figure 14.16
Magnitude (color) and direction (arrows) of the power
flow density for Case 1(a) and 3(b) excitations of the Ag-based CNP
corresponding to the respective dips in the NRR shown in Fig. 14.15. The
correspondingresultsfortheEHD(s)radiatinginfreespaceonlyareshown
in (c) and (d). The results are shown in the
xy
-plane in a circular region
of a radious of 90 nm. In all cases the respective EHDs are located at their
respectiveplacesinthe
xy
-planeat
r
s
=
40nm.Thecurvesrepresentingthe
spherical surfaces of the CNP are likewise shown in (a)and (b).
The ability of the active CNP to significantly suppress the
radiation of EHDs offers an interesting route toward the jamming of
quantum emitters/nano-antennas for a variety of applications, for
example,bio-sensors.Thismaybeofparticularinterestinbiological
fluorescentarraystosuppresstheemissionofcertainemissionlines
whileenhancing that of other, desired, lines.
14.4 Conclusion
Properly designed passive and active spherical CNPs consisting
of a silica nano-core alone or impregnated with gain medium,
