ИСТИНА

In this paper we would like to present composite structure based on porous quartz with silver nanoparticles prepared by different methods. Such structures could be used for SERS- investigations (Surface enhanced Raman scattering) to define small quantities if substances. In such experiments molecules of investigated substance should be close to metallic nanoparticles which concentrate the incident electromagnetic field in small area near them. Main application of this structure may be the enhancement of Raman-signal and second harmonic (SH) signal, because the intensity of both signals is proportional to the local field factor which depends on the size, form, origin and arrangement of nanoparticles. For characterization of the enhancement it is better to study second harmonic generation in this structure, because only one of the scattered or incident field is enhanced while both raman frequencies (stokes and anti-stokes) are in the range of enhancement. This range depends on the location of the localized surface plasmon resonance (LSPR).