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Effects of extraneous surface charges on the enhanced Raman scattering from metallic nanoparticles
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View: Figures


Image of FIG. 1.
FIG. 1.

The SERS enhancement ratio of (a) radial and (b) tangential molecules near a silver sphere of the radius = 5 nm with surface charges: = 5 × 10 C, = 8.33 × 10 C, = 1.67 × 10 C, and = 2.5 × 10 C. The distance between the molecule and the sphere is fixed at = 5 nm.

Image of FIG. 2.
FIG. 2.

(a) The distance dependence of the SERS enhancement ratio for radial molecule near a silver sphere of radius = 5 nm with the surface charges: = 5 × 10 C and = 10 C. The solid and dashed curves represent the results with and without the image-field effects, respectively. The frequency for each curve is chosen to be at the respective resonance. (b) The ratio for the charged sphere with surface charges and to that for the uncharged sphere. The image-field effects are included.

Image of FIG. 3.
FIG. 3.

(a) The two strongest modes of the Raman spectrum of a free pyridine molecule at an incident wavelength of 357 nm as obtained in Ref. . (b) SERS spectrum of pyridine at a separation of 1 nm from a neutral ( = 0) and charged ( = 2.78 × 10 C and = 5.56 × 10 C) silver spheres of radius 5 nm at an incident wavelength 357 nm.

Image of FIG. 4.
FIG. 4.

The enhancement ratio of the 4th-power electric field, |/ |, at the position of the molecule near a neutral sphere of radius (a) = 5 nm and (b) = 10 nm at a distance = 5 nm. The results are obtained from the GN model and Mie theory as indicated in the figure.

Image of FIG. 5.
FIG. 5.

(a) Same as Fig. 4(b) , but including the MLWA results. (b) Same as Fig. 1(a) , but for a sphere of radius = 10 nm using the MLWA theory.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effects of extraneous surface charges on the enhanced Raman scattering from metallic nanoparticles