Surface plasmons at single nanoholes in Au-films

Details Surface plasmons at single nanoholes in Au-films Surface plasmons at single nanoholes in Au-films

2004-01-21

arxiv.org/abs/cond-mat/0401390v1

Physics

Condensed Matter

Materials Science

12 pages, 3 figures

Scientific paper

10.1063/1.1773362

The generation of surface plasmon polaritons (SPP's) at isolated nanoholes in 100 nm thick Au films is studied using near-field scanning optical microscopy (NSOM). Finite-difference time-domain calculations, some explicitly including a model of the NSOM tip, are used to interpret the results. We find the holes act as point-like sources of SPP's and demonstrate that interference between SPP's and a directly transmitted wave allows for 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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