Comparison of optical limiting in silver and gold nanoparticles obtained by pulsed laser ablation

Optical limiting (OL) phenomenon is investigated experimentally using gold (Au) and silver (Ag)nanoparticles (NPs) suspensions in water, in low intensity regime. The efficiency of limiting increased with a decreasein the particle size. In addition, results based on the effects of laser intensity, aperture size, concentration, and size of Auand Ag NPs are presented. The nonlinear optical response of thermo optic origin exhibited by NPs at low CW laserpowers was studied. Both self-defocusing (scattering) and self-focusing effects can be used for optical limiter.

کلیدواژه ها:

Optical limiting ، Nanoparticles ، Refractive index ، Absorption coefficient