Specific Features of Formation of Laser‐Induced Periodic Surface Structures on Ge 2 Sb 2 Te 5 Amorphous Thin Films under Illumination by Femtosecond Laser Pulses

2020 ◽  
Vol 257 (11) ◽  
pp. 1900617
Author(s):  
Sergey Kozyukhin ◽  
Mikhail Smayev ◽  
Vladimir Sigaev ◽  
Yuri Vorobyov ◽  
Yuliya Zaytseva ◽  
...  
Keyword(s):  
Thin Films ◽  
Femtosecond Laser ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Surface Structures ◽  
Periodic Surface ◽  
Amorphous Thin Films

scholarly journals Фемтосекундный лазерный отжиг многослойных тонкопленочных структур на основе аморфных германия и кремния

2020 ◽  
Vol 46 (11) ◽  
pp. 43
Author(s):  
А.В. Колчин ◽  
Д.В. Шулейко ◽  
А.В. Павликов ◽  
С.В. Заботнов ◽  
Л.А. Головань ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Amorphous Silicon ◽  
Laser Annealing ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Surface Structures ◽  
Multilayered Structures ◽  
Spectra Analysis ◽  
Periodic Surface ◽  
Silicon And Germanium

Femtosecond laser annealing of thin-film multilayered structures based on amorphous silicon and germanium were studied. The original samples were synthesized via plasma-enhanced deposition on glass substrate. Scanning electron microscopy revealed formation of periodic surface structures in the irradiated films. Raman spectra analysis revealed crystallization of amorphous germanium as a result of femtosecond laser pulses action, as well as fluence-dependent mixture of the germanium and silicon layers at absence of crystallization of the amorphous silicon layers.

scholarly journals Femtosecond Laser-Induced Periodic Surface Structures on 2D Ti-Fe Multilayer Condensates

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 316
Author(s):  
Oleksandr V. Kuznietsov ◽  
George D. Tsibidis ◽  
Anatoliy V. Demchishin ◽  
Anatoliy A. Demchishin ◽  
Volodymyr Babizhetskyy ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Intermetallic Compounds ◽  
Chemical Interaction ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Hydrogen Gas ◽  
Thin Layers ◽  
Surface Structures ◽  
Surface Pattern ◽  
Periodic Surface

2D Ti-Fe multilayer preparation has been attracting increased interest due to its ability to form intermetallic compounds between metallic titanium and metallic iron thin layers. In particular, the TiFe compound can absorb hydrogen gas at room temperature. We applied femtosecond laser pulses to heat Ti-Fe multilayer structures to promote the appearance of intermetallic compounds and generate surface nanostructuring. The surface pattern, known as Laser Induced Periodic Surface Structures (LIPSS), can accelerate the kinetics of chemical interaction between solid TiFe and gaseous hydrogen. The formation of LIPSS on Ti-Fe multilayered thin films were investigated using of scanning electron microscopy, photo-electron spectroscopy and X-ray diffraction. To explore the thermal response of the multiple layered structure and the mechanisms leading to surface patterning after irradiating the compound with single laser pulses, theoretical simulations were conducted to interpret the experimental observations.

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