Biomedical Engineering Reference
In-Depth Information
Figure 11.10
Magnitude of electric field propagated to different planes
using fractional Fourier transform. Propagation distance for panels (a-k)
are 10 nm, 43 nm, 78 nm, 107 nm, 188 nm, 0.457
μ
m, 0.606
μ
m, 0.836
μ
m,
1.95
μ
m, 2.68
μ
m and 6.5
μ
m, respectively. Panel (l) shows the analytical
far-field in log
10
scale. The structure is excited by a normally incident plane
wave at 1550 nm.
to realize optical torques and novel tweezers on the basis of planar
plasmonicnanostructures.Moreover,dependingonthepropagation
distance, we have observed a characteristic oscillation between
the formation of ring-like structures and the inversion of the
field intensity patterns with respect to the spiral geometry. We
