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HL: Fachverband Halbleiterphysik

HL 40: Plasmonics and nanooptics III

HL 40.11: Vortrag

Mittwoch, 24. März 2010, 13:00–13:15, H32

Efficient surface-plasmon-polariton excitation on nanoparticle structures by inclined incident light — •Andreas Seidel, Wei Cheng, Andrey Evlyukhin, Carsten Reinhardt, and Boris Chichkov — Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover

We study the features of local surface plasmon polariton (SPP) excitation on single and chains of gold nanoparticles positioned near a gold surface using a light beam under inclined incidence. It is shown that by tuning the incident angle and the parameters of the surface nanoparticle structure one could obtain symmetric or asymmetric excitations of SPP beams propagating along certain directions depending on the particle/chain distances. The reasons and conditions for this behaviour and efficiency of SPP excitation as a function of the incident angle are studied. It is demonstrate that the SPP excitation efficiency strongly depends on the incident angle. Adjusting the incident angle to the maximum field component perpendicular to the metal dielectric interface can lead to a large increase of SPP excitation efficiency. In the case of nanoparticle chains the symmetric or asymmetric patterns of the SPP distributions are the result of the interference of the scattered waves generated by each nanoparticle in a structure. The theoretical consideration is based on the Green*s function technique for the Maxwell equations of the total electric field and on the point-dipole approximation. Experimental investigation is realized by leakage radiation microscopy in real and reciprocal space.