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The subwavelength confinement of surface plasmon polaritons (SPPs) makes themattractive for various applications such as sensing, light generation and solarenergy conversion. Near-field microscopy associated with interferometricdetection allows to visualize both the amplitude and phase of SPPs. However,their full quantitative characterization in a reflection configuration ischallenging due to complex wave patterns arising from the interference betweenseveral excitation channels. Here, we present near-field measurements of SPPson large monocrystalline gold platelets in the visible spectral range. We studysystematically the influence of the incident angle of the exciting light on theSPPs launched by an atomic force microscope tip. We find that the amplitude andphase signals of these SPPs are best disentangled from other signals at grazingincident angle relative to the edge of the gold platelet. Furthermore, weintroduce a simple model to explain the phase shift observed between the SPPamplitude and phase profiles. Using this model, the wavelength and propagationlength of the tip-launched plasmons are retrieved by isolating and fittingtheir signals far from the platelets edges. Our experimental results are inexcellent agreement with theoretical models using gold refractive index values.The presented method to fully characterize the SPP complex wavevector couldenable the quantitative analysis of polaritons occurring in different materialsat visible wavelengths.

Quantitative near-field characterization of surface plasmon polaritons on monocrystalline gold platelets