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The European Physical Journal D
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The financial support of CONCyTEG grant 09-04-K662-072,
CONACyT grant 49482, and PROMEP are acknowledged.
F. Castillo thanks to CONACYT for the PhD scholarship
(221405). Authors thanks to Q.F.B. Ma. de Lourdes Gonz´alez
Gonza´lez (IF-UASLP) for technical support in the synthesis of
gold and silica particles; M.C. Claudia El´ıas Alfaro and Ing.
Fernando Rodr´ıguez Ju´arez, from (IMUASLP), for her advis-
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