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Spectral bandwidth and phase effects of resonantly excited ultrafast surface plasmon pulses
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Calculated (Ref. 14) (solid line) and measured (filled circles) reflectivity of a femtosecond laser pulse of a gold film in the vicinity of the SPP coupling angle . Inset: schematic of the prism configuration. (b) Calculated and (c) measured reflectivity as a function of photon energy and incidence angle.

Image of FIG. 2.
FIG. 2.

(a) Spectra of reflected femtosecond laser pulses at different incidence angles. (b) Comparison of scattered SPP pulse spectrum (black line), incident pulse spectrum (dashed line), reflected pulse spectrum at optimal SPP coupling angle (green line), and difference spectrum (square markers) between incident and reflected pulse spectra. (c) Spectral bandwidth (FWHM) of the SPP excitation by prism coupling for gold films (orange line) and silver films (black line).

Image of FIG. 3.
FIG. 3.

(a) The measured phase (red solid line) of the reflected pulse at resonant SPP excitation is extracted by Fourier analysis from the spectral interferogram (black line). As a comparison we show the calculated phase of the reflected field (red dashed line) and the SPP field (blue dashed line). A spectrally flat offset was added to the measured and calculated phases to overlap them. IAC of the reflected pulse (b) under SPP excitation condition, indicating satellite pulses that are absent in (c), the reference IAC taken in the TIR configuration.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Spectral bandwidth and phase effects of resonantly excited ultrafast surface plasmon pulses