Propagation and diffraction of locally excited surface plasmons.
With the use of optical near-field techniques, it is now possible to excite or observe surface plasmons with high lateral resolution. A theoretical study is presented of surface plasmon excitation by near-field optical probes and the influence of well-defined structures on surface plasmon propagation and surface plasmon detection in the far field. The generation and the diffraction of the surface plasmon is calculated by using a theoretical scheme founded upon a first-order perturbation expansion of the Rayleigh-Fano method. A very good agreement is obtained between numerical and experimental results. The theoretical tools used should prove a useful guideline for future experiments of nanooptics with surface plasmons.
Baida
F I
FI
Centre National de la Recherche Scientifique, Université de Franche-Comté, Besançon, France. fbaida@univ-fcomte.fr
Van Labeke
D
D
Bouhelier
A
A
Huser
T
T
Pohl
D W
DW