Fabrication of micrometre-sized periodic gratings in free-standing metallic foils for laser-plasma experiments  

作　　者：C.C.Gheorghiu M.Cerchez E.Aktan R.Prasad F.Yilmaz N.Yilmaz D.Popa O.Willi V.Leca 

机构地区：[1]Extreme Light Infrastructure-Nuclear Physics,Horia Hulubei National Institute for Physics and Nuclear Engineering,077125 Magurele,Romania [2]Institut fur Laser-und Plasmaphysik,Heinrich-Heine-Universitat,40225 Diisseldorf,Germany

出　　处：《High Power Laser Science and Engineering》2022年第1期17-31,共15页高功率激光科学与工程（英文版）

基　　金：supported by the ELI-NP Phase Ⅱ project,co-financed by the Romanian Government and the European Union through the European Regional Development Fund-the Competitiveness Operational Programme(contract No.1/07.07.2016,COP,ID 1334);Funding from the National Program‘Installations and Strategic Objectives of National Interest’and‘Nucleu’project PN19060105 of the Romanian Government;funding from the European Union Framework Programme for Research and Innovation Horizon 2020 under grant agreement No.871161.

摘　　要：Engineered targets are expected to play a key role in future high-power laser experiments calling for joined, extensive knowledge in materials properties, engineering techniques and plasma physics. In this work, we propose a novel patterning procedure of self-supported 10 μm thick Au and Cu foils for obtaining micrometre-sized periodic gratings as targets for high-power laser applications. Accessible techniques were considered, by using cold rolling, electronbeam lithography and the Ar-ion milling process. The developed patterning procedure allows efficient control of the grating and foil surface on large area. Targets consisting of patterned regions of 450 μm × 450 μm, with 2 μm periodic gratings, were prepared on 25 mm × 25 mm Au and Cu free-standing foils, and preliminary investigations of the microtargets interacting with an ultrashort, relativistic laser pulse were performed. These test experiments demonstrated that,in certain conditions, the micro-gratings show enhanced laser energy absorption and higher efficiency in accelerating charge particle beams compared with planar thin foils of similar thickness.

关 键 词：laser driven plasmas on structured targets metallic foils micro-grating patterned targets 

分 类 号：TN249[电子电信—物理电子学]