Journal
APPLIED PHYSICS LETTERS
Volume 85, Issue 3, Pages 467-469Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1773362
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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. (C) 2004 American Institute of Physics.
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