scholarly journals Impact of Pre-Patterned Structures on Features of Laser-Induced Periodic Surface Structures

Molecules ◽  
2021 ◽  
Vol 26 (23) ◽  
pp. 7330
Author(s):  
Stella Maragkaki ◽  
Panagiotis C. Lingos ◽  
George D. Tsibidis ◽  
George Deligeorgis ◽  
Emmanuel Stratakis
Keyword(s):  
Laser Pulses ◽  
Laser Wavelength ◽  
Femtosecond Laser Pulses ◽  
Surface Structures ◽  
Periodic Pattern ◽  
Patterned Surfaces ◽  
Periodic Surface ◽  
Multi Scale ◽  
Patterned Structures ◽  
The Impact

The efficiency of light coupling to surface plasmon polariton (SPP) represents a very important issue in plasmonics and laser fabrication of topographies in various solids. To illustrate the role of pre-patterned surfaces and impact of laser polarisation in the excitation of electromagnetic modes and periodic pattern formation, Nickel surfaces are irradiated with femtosecond laser pulses of polarisation perpendicular or parallel to the orientation of the pre-pattern ridges. Experimental results indicate that for polarisation parallel to the ridges, laser induced periodic surface structures (LIPSS) are formed perpendicularly to the pre-pattern with a frequency that is independent of the distance between the ridges and periodicities close to the wavelength of the excited SPP. By contrast, for polarisation perpendicular to the pre-pattern, the periodicities of the LIPSS are closely correlated to the distance between the ridges for pre-pattern distance larger than the laser wavelength. The experimental observations are interpreted through a multi-scale physical model in which the impact of the interference of the electromagnetic modes is revealed.

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 Monitoring of Evolving Laser Induced Periodic Surface Structures

2019 ◽  
Vol 9 (17) ◽  
pp. 3636
Author(s):  
Andrea Lübcke ◽  
Zsuzsanna Pápa ◽  
Matthias Schnürer
Keyword(s):  
Fringe Pattern ◽  
Imaging System ◽  
Low Cost ◽  
Scattered Light ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Surface Structures ◽  
Periodic Surface ◽  
Surface Modulation ◽  
Optical Imaging System

Laser induced periodic surface structures (LIPSS) are generated on titanium and silicon nitride surfaces by multiple femtosecond laser pulses. An optical imaging system is used to observe the backscattered light during the patterning process. A characteristic fringe pattern in the backscattered light is observed and evidences the surface modification. Experiments are complemented by finite difference time domain numerical simulations which clearly show that the periodic surface modulation leads to characteristic modulations in the coherently scattered light field. It is proposed that these characteristic fringe pattern can be used as a very fast and low-cost monitor of LIPSS formation formation during the manufacturing process.

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