Abstract
Steady-state absorption and transient nonlinear response of copper nanoparticle composites in LiNbO 3 were investigated in the visible range. Negative ion implantation at 60 keV was applied to fabricate the Cu nanoparticles in the insulators. The surface plasmon band in steady-state absorption spectra in LiNbO 3 resulted from formation of nanoparticles and showed a broadening and shift to red in comparison with the band in amorphous SiO 2 and MgO · 2.4(Al 2O 3). Transient absorption was measured with the technique of pump–probe femtosecond spectroscopy. The transient bleaching band also shifted with the steady-state plasmon peak and recovered within a picosecond. The transient spectrum of the composites in LiNbO 3, reflects the energy transfer in nanoparticles, overlaps with the optical damage in the matrix. The electron–phonon coupling constant of Cu nanoparticles in LiNbO 3 yielded a value of g=2.4×10 16 W/m 3 K.
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