Biomedical Engineering Reference
In-Depth Information
Figure 15.9
(a) Illustration of the plasmon excitation at position 1,
propagation and outcoupling at position 2. (b) Experimental emission
spectra from the nanorods at the left end of the nanowire (red markers),
and recorded at the opposite end of the nanowire for P- (blue markers) and
S- (black markers) polarization. The black dashed line shows the calculated
wavelength dispersion for the transmitted light with P-polarization. The
emission in P-polarization at the opposite nanowire end (blue) can be
well reproduced by convoluting the nanowire transmission (black dashed)
with the nanorod emission (red). P and S polarization refer to parallel and
perpendicular directions with respect to the long axis of the nanowire,
respectively.
near-field emission intensity distribution of the nanorods, as
illustrated in Fig. 15.8 b, which results in effective coupling for
nanorodsorientedalongthelongaxisofthenanowire.Furthermore
the nanorod absorption and emission is known to be significantly
enhanced in parallel polarization [52, 54, 56]. Comparing the
emission intensities between positions 1 and 2 (i.e., of the light
emitted by the rods and the light transmitted and collected at
the other nanowire end) we obtain a reduction of a factor 80,
which is reasonable considering the following rough estimation: (i)
