NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2014, 5 (5), P. 650-658
OPTICAL MICRO-STRUCTURING OF METAL FILMS ON THE SURFACE OF DIELECTRIC MATERIALS: PROSPECTS OF SHAPING BY NON-DIFFRACTING OPTICAL BEAMS
R. Drampyan – Institute for Physical Research, National Academy of Sciences of Armenia, 0203, Ashtarak-2; Armenian – Russian (Slavonic) University, H. Emin str. 123, 0051, Yerevan, Armenia; rafael.drampyan@gmail.com
T. Vartanyan – National Research University of Information Technologies, Mechanics and Optics, St. Petersburg, Russia; Tigran.Vartanyan@mail.ru
The technique of optical micro-structuring of metal lms based on processes of metal atoms adsorption on the surface of crystalline substrate and simultaneous controllable photo-stimulated desorption of atoms by non-uniform laser beam illumination is presented. The experiments were performed for sodium atom deposition on a sapphire substrate. The sapphire substrate was illuminated through a commercial linear mire with a pitch of 10 μm by a 440 nm laser beam with 1W/cm2 intensity. This provides the nonuniform spatial distribution of the illumination intensity over the sapphire surface and optical control of sodium atom deposition on the sapphire substrate, preventing the nucleation and growth of the granular fi lm in the illuminated areas. Experiments showed that the mire pattern was well reproduced in the sodium deposits, thus creating the microstructured metallic lm with few tens nm thickness. The novel suggestion to use nondi racting optical beams for high contrast microstructuring of surface metal lm is presented.
Keywords: metal nanoparticle, adsorption, desorption, laser controlled growth, non-di racting optical beams.
PACS 32.80.Lg, 34.50.Dy, 81.16.Mk