5649

5649

بررسي ميدان الكتريكي در برهم كنش ليزرهاي فمتوثانيه با اهداف فلزي

كارشناسي ارشد

فيزيك

مهر 1385

مهر 1385

دكتر مهديه

Abstract High intensity lasers interacting matters and plasmas have been interested for many years. Laser-produced plasmas are attractive compact x-ray sources. Recently some experimental results have shown that hard x-ray emission from plasmas produced by intense laser pulses on optically polished targets can be enhanced if nano-particle coated targets exposed to such intense laser beams. In this work we have modeled the local enhancement by spherical nanoparticles. Using “Rayleigh” theory and “Drude-Lorentz” model the scattering cross section have been calculated. The results show that field enhancement has a resonance behavior and depends strongly on particle size and geometry of nano-particles.