scholarly journals Femtosecond Laser-Induced Periodic Surface Structures on Fused Silica: The Impact of the Initial Substrate Temperature

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1340 ◽  
Author(s):  
Stephan Gräf ◽  
Clemens Kunz ◽  
Sebastian Engel ◽  
Thibault Derrien ◽  
Frank Müller
Keyword(s):  
Dielectric Materials ◽  
Fused Silica ◽  
Surface Structures ◽  
Formation Mechanisms ◽  
Spatial Period ◽  
Threshold Fluence ◽  
Periodic Surface ◽  
Initial Substrate ◽  
Fs Laser ◽  
The Impact

The formation and properties of laser-induced periodic surface structures (LIPSS) were investigated upon fs-laser irradiation of fused silica at different initial substrate temperatures, TS. For substrate heating between room temperature, TRT, and TS = 1200 °C, a continuous wave CO2 laser was used as the radiation source. The surface structures generated in the air environment at normal incidence with five successive fs-laser pulses (pulse duration, τ = 300 fs, laser wavelength, λ = 1025 nm, repetition frequency, frep = 1 kHz) were characterized by using optical microscopy, scanning electron microscopy, and 2D-Fourier transform analysis. The threshold fluence of fused silica was systematically investigated as a function of TS. It was shown that the threshold fluence for the formation of low-spatial frequency LIPSS (LSFL) decreases with increasing TS. The results reveal that the initial spatial period observed at TRT is notably increased by increasing TS, finally leading to the formation of supra-wavelength LIPSS. The findings are discussed in the framework of the electromagnetic interference theory, supplemented with an analysis based on thermo-convective instability occurring in the laser-induced molten layer. Our findings provide qualitative insights into the formation mechanisms of LIPSS, which allow improvements of the control of nanostructure formation to be made for corresponding applications of dielectric materials in the future.

scholarly journals Large-Area Fabrication of Laser-Induced Periodic Surface Structures on Fused Silica Using Thin Gold Layers

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1187 ◽  
Author(s):  
Clemens Kunz ◽  
Sebastian Engel ◽  
Frank Müller ◽  
Stephan Gräf
Keyword(s):  
Fused Silica ◽  
Surface Structures ◽  
Spatial Period ◽  
Direct Writing ◽  
Large Area ◽  
Periodic Surface ◽  
Single Spot ◽  
Research Activities ◽  
Wide Range ◽  
Fs Laser

Despite intensive research activities in the field of laser-induced periodic surface structures (LIPSS), the large-area nanostructuring of glasses is still a challenging problem, which is mainly caused by the strongly non-linear absorption of the laser radiation by the dielectric material. Therefore, most investigations are limited to single-spot experiments on different types of glasses. Here, we report the homogeneous generation of LIPSS on large-area surfaces of fused silica using thin gold layers and a fs-laser with a wavelength λ = 1025 nm, a pulse duration τ = 300 fs, and a repetition frequency frep = 100 kHz as radiation source. For this purpose, single-spot experiments are performed to study the LIPSS formation process as a function of laser parameters and gold layer thickness. Based on these results, the generation of large-area homogenous LIPSS pattern was investigated by unidirectional scanning of the fs-laser beam across the sample surface using different line spacing. The nanostructures are characterized by a spatial period of about 360 nm and a modulation depth of around 160 nm. Chemical surface analysis by Raman spectroscopy confirms a complete ablation of the gold film by the fs-laser irradiation. The characterization of the functional properties shows an increased transmission of the nanostructured samples accompanied by a noticeable change in the wetting properties, which can be additionally modified within a wide range by silanization. The presented approach enables the reproducible LIPSS-based laser direct-writing of sub-wavelength nanostructures on glasses and thus provides a versatile and flexible tool for novel applications in the fields of optics, microfluidics, and biomaterials.

Femtosecond diffraction dynamics of laser-induced periodic surface structures on fused silica

2013 ◽  
Vol 102 (5) ◽  
pp. 054102 ◽  
Author(s):  
S. Höhm ◽  
A. Rosenfeld ◽  
J. Krüger ◽  
J. Bonse
Keyword(s):  
Fused Silica ◽  
Surface Structures ◽  
Periodic Surface

Generation of laser-induced periodic surface structures on transparent material-fused silica

2016 ◽  
Vol 108 (18) ◽  
pp. 181607 ◽  
Author(s):  
Simon Schwarz ◽  
Stefan Rung ◽  
Ralf Hellmann
Keyword(s):  
Fused Silica ◽  
Surface Structures ◽  
Transparent Material ◽  
Periodic Surface

scholarly journals Laser induced tunable Ge2Sb2Te5 phase-change gratings

2021 ◽  
Vol 2015 (1) ◽  
pp. 012154
Author(s):  
Pavel I. Trofimov ◽  
Irina G. Bessonova ◽  
Petr I. Lazarenko ◽  
Demid A. Kirilenko ◽  
Nikolay A. Bert ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase Change ◽  
Surface Structures ◽  
The Other ◽  
Formation Mechanisms ◽  
Laser Polarization ◽  
Time Cost ◽  
Periodic Surface ◽  
Light Manipulation ◽  
High Flexibility

Abstract Periodic photonic nano- and microstructures are routinely used for light manipulation at the nanoscale. However, their fabrication process is demanding in terms of time, cost and facilities. Here we demonstrate a rapid laser-assisted method for fabrication of gratings in Ge2Sb2Te5 (GST) thin films, based on the formation of laser induced periodic surface structures (LIPSS). LIPSS formation mechanisms dependent on the wavelength of the operating laser, lead to high flexibility of the process, producing gratings with tunable period and orientation with respect to the initial laser polarization. The phase-change properties of GST, on the other hand, allows to fabricate phase gratings with strong modulation of refractive index, which are rewritable in nature.

Laser-induced periodic surface structures on fused silica upon cross-polarized two-color double-fs-pulse irradiation

2015 ◽  
Vol 336 ◽  
pp. 39-42 ◽  
Author(s):  
S. Höhm ◽  
M. Herzlieb ◽  
A. Rosenfeld ◽  
J. Krüger ◽  
J. Bonse
Keyword(s):  
Fused Silica ◽  
Surface Structures ◽  
Pulse Irradiation ◽  
Periodic Surface

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.

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