Surface plasmons at single nanoholes in Au-films
L. Yin, V. K. Vlasko-Vlasov, A. Rydh, J. Pearson, U. Welp, S.-H., Chang, S. K. Gray, G. C. Schatz, D. E. Brown, C. W. Kimball
TL;DR
This study investigates how isolated nanoholes in gold films generate surface plasmon polaritons, revealing their properties and how to manipulate near-field patterns using incident beam parameters.
Contribution
The paper demonstrates that nanoholes act as point sources of SPPs and shows how interference patterns can be used to determine SPP characteristics.
Findings
Holes act as point-like SPP sources
Interference patterns reveal SPP wavelength, phase, decay length
Near-field patterns are controllable via incident beam angle and polarization
Abstract
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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