Surface plasmons at single nanoholes in Au films

Yin, L.; Vlasko-Vlasov, V.K.; Rydh, A.; Pearson, J.; Welp, U.; Chang, S.-H.; Gray, S.K.; Schatz, G.C.; Brown, D.B.; Kimball, C.W.
July 2004
Applied Physics Letters;7/19/2004, Vol. 85 Issue 3, p467
Academic Journal
The generation of surface plasmon polaritons (SPPs) at isolated nanoholes in 100 nm thick Au films is studied using near-field scanning optical microscopy. Finite-difference time-domain calculations, some explicitly including a model of the scanning tip, are used to interpret the results. We find the holes act as point-like sources of SPPs and demonstrate that the interference between the SPP and a directly transmitted wave allows determination of the wavelength, phase, and decay length of the SPP. The near-field intensity patterns can be manipulated by varying the angle and polarization of the incident beam.


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