Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1538415 | Optics Communications | 2010 | 4 Pages |
Silver nanoparticles have been prepared using hydrogen gas as the reducing agent for silver nitrate and poly(vinyl pyrrolidone) as the capping agent; the reaction was carried out at 70 °C for 3 h. The size of the nanoparticles was found to be about 20 nm as analyzed using transmission electron micrographs. The X-ray diffraction pattern revealed the face-centered cubic (fcc) structure of silver nanoparticles. The linear absorption of Ag nanoparticles, α, is obtained about 3.71 cm−1. The non-linear refractive indices of silver nanoparticles were defined by the z-scan technique using CW He–Ne laser (λ = 632.8 nm) at different incident intensities. The magnitude of non-linear refractive index (n2) was measured to be in the order of 10−7 (cm2/W) with a negative sign. Therefore self-defocusing phenomena is taking placed for Ag nanoparticles.