Picosecond laser registration of interference pattern by oxidation of thin Cr films

Veiko, Vadim P.; Yarchuk, M. V.; Zakoldaev, R. A.; Gedvilas, Mindaugas; Račiukaitis, Gediminas; Kuzivanov, Michail; Baranov, A. N.

doi:10.1016/j.apsusc.2017.01.194

Cited by 12 publications

(7 citation statements)

References 16 publications

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“…Their studies were performed to understand the oxidation rate dynamics. Veiko et al [15] successfully oxidized chromium thin coatings using a picosecond laser with a fundamental wavelength of 1064 nm, confirming the formation of an oxide layer by Raman spectroscopic studies. They also report the formation of CrO2 state, which is difficult to detect using x-ray diffraction technique.…”

Section: Introductionmentioning

confidence: 88%

Chromium oxide formation on nanosecond and femtosecond laser irradiated thin chromium films

et al. 2019

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Section: Introductionmentioning

confidence: 88%

Chromium oxide formation on nanosecond and femtosecond laser irradiated thin chromium films

et al. 2019

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“…To determine the thickness of the oxide layer H and its distribution over the film surface, we solved Equation (1) using the "equivalent time" method proposed earlier by Libenson, M.N. [35], which had numerous applications in our and other authors' works (for example, [24,[28][29][30][31][32][33][34]) for calculation of the dynamics of oxidation, taking into account the temperature distribution in the film at the heating T heat and cooling T cool stages for each pulse [34]:…”

Section: Setting the Simulation Problemmentioning

confidence: 99%

“…To determine the thickness of the oxide layer H and its distribution over the film surface, we solved Equation (1) using the “equivalent time” method proposed earlier by Libenson, M.N. [ 35 ], which had numerous applications in our and other authors’ works (for example, [ 24 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ]) for calculation of the dynamics of oxidation, taking into account the temperature distribution in the film at the heating T heat and cooling T cool stages for each pulse [ 34 ]:

where ρ me , c me , ρ ox , c ox , ρ S , and c S are the densities and heat capacities of the metal layer, oxide layer, and substrate, respectively; a S is the substrate thermal diffusivity; h and h me = ( h − H/υ PB ) are the thicknesses of the metal layer before and after laser action; υ PB is the Pilling–Bedworth coefficient, which equals the ratio of the molar volumes of the metal oxide and metal itself, 1.78 for Ti [ 36 ]; T in is the initial film temperature; q ( x ) is the spatial distribution of laser intensity along the transverse coordinate x , which was approximated by a sine function; τ is the laser pulse duration; A(x, H) is the film absorption, which was evaluated for each pulse using the optical matrices method (according to [ 37 ]) depending on the oxide layer thickness at the beginning of the pulse action. The heat transfer characteristic ( γ ) from the film to the substrate corresponds to:

…”

Section: Laser Interference Patterningmentioning

confidence: 99%

“…Recently, various technical combinations of the thermochemical laser recording method were realized on Ti films: the direct action of a focused scanning laser beam [ 24 , 25 ], the formation of thermochemical laser-induced periodic surface structures (LIPSSs) [ 21 , 23 , 26 , 27 ], or the thermochemical registration of an interference pattern [ 28 , 29 ], including researches by our own group. However, to this day, there is no confirmed theoretical model that could predict the optimal laser processing parameters (e.g., number of laser pulses or fluence) required to fabricate the structure of minimum width while maintaining the maximum contrast.…”

Section: Introductionmentioning

confidence: 99%

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Laser Thermochemical High-Contrast Recording on Thin Metal Films

et al. 2020

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Laser-induced thermochemical recording of nano- and microsized structures on thin films has attracted intense interest over the last few decades due to essential applications in the photonics industry. Nevertheless, the relationship between the laser parameters and the properties of the formed oxide structures, both geometrical and optical, is still implicit. In this work, direct laser interference patterning of the titanium (Ti) film in the oxidative regime was applied to form submicron periodical structures. Depending on the number of laser pulses, the regime of high contrast structures recording was observed with the maximum achievable thickness of the oxide layer. The investigation revealed high transmittance of the formed oxide layers, i.e., the contrast of recorded structures reached up to 90% in the visible range. To analyze the experimental results obtained, a theoretical model was developed based on calculations of the oxide formation dynamics. The model operates on Wagner oxidation law and the corresponding optical properties of the oxide–metal–glass substrate system changing nonlinearly after each pulse. A good agreement of the experimental results with the modeling estimations allowed us to extend the model application to other metals, specifically to those with optically transparent oxides, such as zirconium (Zr), hafnium (Hf), vanadium (V), niobium (Nb), and tantalum (Ta). The performed analysis highlighted the importance of choosing the correct laser parameters due to the complexity and nonlinearity of optical, thermal, and chemical processes in the metal film during its laser-induced oxidation in the air. The developed model allowed selecting the suitable temporal–energetic regimes and predicting the optical characteristics of the structures formed with an accuracy of 10%. The results are promising in terms of their implementation in the photonics industry for the production of optical converters.

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“…To create a stable, double-beam interference pattern in the focal plane, a laser beam was split by a phase grating, and two identical beams of the first interference order were subtracted by a spatial filter. Next, the beams were focused by the second lens creating an interference pattern at the intersection [27,28]. In the case of a confocal scheme, the angle between two beams is changed to manage the period of the pattern, which is determined as [29]:…”

Section: Laser Treatmentmentioning

confidence: 99%

Picosecond laser writing of Ag−SiO2 nanocomposite nanogratings for optical filtering

Andreeva

Koval

Sergeev

et al. 2020

Optics and Lasers in Engineering

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In this article, we propose a novel approach for fabricating of dielectric nanogratings via direct laser writing. Possibilities of a well-controlled ultrashort laser recording of Ag-SiO 2 nanocomposite gratings and their optical properties are examined. The mechanisms of laser processing involve silver nanoparticle growth in nanoporous silica glass films and laser interferencebased formation of a periodic grating-like nanorelief. It is shown that laser energy should stay below a surface "grooves" formation threshold for laserinscription of the interference-based grating. Otherwise, another periodic structure oriented parallel to the incident laser polarization appears to erase the interference pattern. The parameter windows required for a controlled fabrication of the obtained structures are determined. The required thresholds decay with the number of applied laser pulses is explained by a similarity in the roles of the absorbing nanoparticles and surface defect accumulation typically leading to such dependencies. The optical properties of the obtained gratings are shown to depend on the angle between the incidence plane and the grating direction. When these directions coincide, a signal enhancement with a period-dependent blue-shift is revealed in the diffuse scattering spectra. When these directions are perpendicular, the signal is less enhanced, and a red shift is observed. The observed results are promising in short laser fabrication of different optical components, such as, reflective optical filters.

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Picosecond laser registration of interference pattern by oxidation of thin Cr films

Cited by 12 publications

References 16 publications

Chromium oxide formation on nanosecond and femtosecond laser irradiated thin chromium films

Chromium oxide formation on nanosecond and femtosecond laser irradiated thin chromium films

Laser Thermochemical High-Contrast Recording on Thin Metal Films

Picosecond laser writing of Ag−SiO2 nanocomposite nanogratings for optical filtering

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