Surface plasmon polaritons are the light of the nanoworld, with a broad spectrum of special properties. These properties open the field for a high number of applications, both in the fields of low and high intensities. In the present work localized plasmons (LSPP) have been resonantly excited by ultrashort (n.10fs), high intensity (up to n.10¹⁸ W/cm²) pulses of Ti:Sa lasers on gold nanoparticles, implanted into a transparent polymer. The laser shots created craters in the studied samples. The volume of these craters is presented as the function of the exciting laser intensity for the samples with and without resonant gold nanoparticles as well as the creation of deuterium in the nanoparticle seeded sample with Raman and LIBS spectroscopy. Preliminary data indicate significant energy production and also nuclear transmutation (hydrogen to deuterium), clearly proving the decisive role of the unique properties of the LSPP-s. BN seeded samples have also been studied, where the p¹¹B reaction has been observed by Thompson parabola measurements and by detecting α particles. Data obtained by other techniques ( mass spectrometry ) are also presented.