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Coloring fluorescence emission with silver nanowires
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Scheme of the experimental setup: A glass slide with an immobilized silver nanowire on top is covered with R6G molecules. The 532 nm laser beam is focused and positioned on the wire, exciting R6G molecules. Part of the fluorescence emission couple into plasmons propagating along the wire. The color of the emission at the distal ends of the wire depends on the propagation distance. Panels (b) and (c) show dark field and bright field optical images of the nanowire, respectively, while (d) shows fluorescence color images of the same nanowire as a function of laser spot position. The color of the emitting ends can be efficiently tuned from yellow-green to reddish by varying the position of the exciting beam (the most intense spot on the image). In the row at the bottom of panel (d) a magnified view of the region around the distal nanowire end outlined with a square is shown. The scale bar corresponds to length.

Image of FIG. 2.
FIG. 2.

Fluorescence spectra collected from the right emitting end of the wire as a function of the laser spot position along the wire. The spectra were collected by means of a fiber aligned at the image plane of the microscope. The area from which the spectra were collected is outlined with the blue circle on the image. The white bar at the left upper corner corresponds to length.

Image of FIG. 3.
FIG. 3.

(top) Logarithm of fluorescence intensity as a function of distance between the excitation spot and the emitting wire end (from the data in Fig. 2) and corresponding linear fits. (bottom) Plasmon propagation length for 550, 600, 650, and 700 nm extracted from the fits.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Coloring fluorescence emission with silver nanowires