Affiliation: | aInstitute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan bNPO Akadempribor, Akademgorodok, Tashkent 700125, Uzbekistan cUniversité Pierre et Marie Curie, Centre de la National de la Recherche Scientifique, F75015 Paris, France |
Abstract: | The optical, structural, and nonlinear optical properties of silver nanoparticles prepared by laser ablation in various liquids were investigated at 397.5, 532, and 795 nm. The TEM and spectral measurements have shown temporal dynamics of size distribution of Ag nanoparticles in solutions. The thermal-induced self-defocusing dominated in the case of high pulse repetition rate as well as in the case of nanosecond pulses. In the case of low pulse repetition rate, the self-focusing (γ = 3 × 10−13 cm2 W−1) and saturated absorption (β = −1.5 × 10−9 cm W−1) of picosecond and femtosecond radiation were observed in these colloidal solutions. The nonlinear susceptibility of Ag nanoparticles ablated in water was measured to be 5 × 10−8 esu (at λ = 397.5 nm). |