Femtosecond laser nanostructuring of titanium metal towards fabrication of low-reflective surfaces over broad wavelength range

Dar, Mudasir H.; Kuladeep, R.; Saikiran, V.; Rao, D. Narayana

doi:10.1016/j.apsusc.2016.03.008

Cited by 51 publications

(36 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…FLSP can be used to create low reflectivity, high absorption surfaces for light with wavelengths from ultraviolet to terahertz radio waves. [33][34][35][36] Such optoelectronic properties can be used for solar thermal energy conversion, molecular spectroscopy, plasmonics, and stealth technologies. Recently, FLSP of Ti has been shown to improve wear for tribological applications.…”

Section: Introductionmentioning

confidence: 99%

Growth mechanisms of multiscale, mound-like surface structures on titanium by femtosecond laser processing

Peng

Bell

Zuhlke

et al. 2017

Journal of Applied Physics

View full text Add to dashboard Cite

Femtosecond laser surface processing (FLSP) can be used to functionalize many surfaces, imparting specialized properties such as increased broadband optical absorption or superhydrophobicity/-hydrophilicity. In this study, the subsurface microstructure of a series of mound-like FLSP structures formed on commercially pure titanium using five combinations of laser fluence and cumulative pulse counts was studied. Using a dual beam Scanning Electron Microscope with a Focused Ion Beam, the subsurface microstructure for each FLSP structure type was revealed by cross-sectioning. The microstructure of the mounds formed using the lowest fluence value consists of the original Ti grains. This is evidence that preferential laser ablation is the primary formation mechanism. However, the underlying microstructure of mounds produced using higher fluence values was composed of a distinct smaller-grained a-Ti region adjacent to the original larger Ti grains remaining deeper beneath the surface. This layer was attributed to resolidification of molten Ti from the hydrodynamic Marangoni effect driven fluid flow of molten Ti, which is the result of the femtosecond pulse interaction with the material.

show abstract

Section: Introductionmentioning

confidence: 99%

Growth mechanisms of multiscale, mound-like surface structures on titanium by femtosecond laser processing

Peng

Bell

Zuhlke

et al. 2017

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…A large amount of UHSFLs of 30–50 nm per period are located in the troughs and joint regions of LSFLs/HSFLs. The periods of UHSFLs are much narrower than those prepared on Ti by fs-LA in air [ 27 , 28 , 29 ]. In a relatively deeper trough of LSFLs/HSFLs, UHSFLs are characterized by extra stretched nanowires from their middle parts (pointed out by green arrows in Figure 1 e), so that it is difficult to differentiate them from main UHSFLs ( Figure 1 e).…”

Section: Resultsmentioning

confidence: 99%

“…Recently, our group has shown the necessity to define sub-100 nm [ 17 , 18 , 19 , 20 ] periods as a new category of ultrahigh spatial frequency LIPSSs (UHSFLs) because (1) UHSFLs whose periods are as small as 40 nm [ 17 , 21 ] are very difficult to form on semiconductors (so far, only two reports on Si) when compared with normal HSFLs with periods in the range of 100–200 nm [ 15 , 22 , 23 ]; (2) The periods of UHSFLs prepared on metals are much smaller than normal HSFLs with periods of hundreds of nm [ 24 , 25 , 26 ]. For example, Bosen et al prepared homogeneous UHSFLs (periods: 70–90 nm) on Ti by fs-LA in air (λ = 790 nm, τ = 30–160 fs and υ = 1 kHz) [ 27 , 28 , 29 ] and found that such fine structures can be easily destroyed during the friction tests in two different lubricating oils [ 30 ]. Sedao et al revealed the role of surface melting and resolidification in the formation of UHSFLs of 70–90 nm in a period on Ni [ 31 ].…”

Section: Introductionmentioning

confidence: 99%

Multiscale Hierarchical Micro/Nanostructures Created by Femtosecond Laser Ablation in Liquids for Polarization-Dependent Broadband Antireflection

et al. 2020

View full text Add to dashboard Cite

In this work, we present the possibility of producing multiscale hierarchical micro/nanostructures by the femtosecond laser ablation of transition metals (i.e., Ta and W) in water and investigate their polarization-dependent reflectance. The hierarchical micro/nanostructures are composed of microscale-grooved, mountain-like and pit-rich structures decorated with hybrid laser-induced periodic surface structures (LIPSSs). The hybrid LIPSSs consist of low/high and ultrahigh spatial frequency LIPSSs (LSFLs/HSFLs and UHSFLs). LSFLs/HSFLs of 400–600 nm in a period are typically oriented perpendicular to the direction of the laser polarization, while UHSFLs (widths: 10–20 nm and periods: 30–50 nm) are oriented perpendicular to the curvatures of LSFLs/HSFLs. On the microstructures with height gradients, the orientations of LSFLs/HSFLs are misaligned by 18°. On the ablated W metasurface, two kinds of UHSFLs are observed. UHSFLs become parallel nanowires in the deep troughs of LSFLs/HSFLs but result in being very chaotic in shallow LSFLs, turning into polygonal nanonetworks. In contrast, chaotic USFLs are not found on the ablated Ta metasurfaces. With the help of Fourier transform infrared spectroscopy, it is found that microgrooves show an obvious polarization-dependent reflectance at wavelengths of 15 and 17.5 μm associated with the direction of the groove, and the integration of microstructures with LSFs/HSFLs/UHSFLs is thus beneficial for enhancing the light absorbance and light trapping in the near-to-mid-infrared (NIR-MIR) range.

show abstract

“…It is known that during normal incidence of femtosecond, linearly polarized laser pulses, low-spatial-frequency laser-induced periodic surface structures (LSFL) are formed on the copper surface, which demonstrate the effect of diffraction staining [25,26]. That is, the appearance of a surface relief demonstrating properties of a diffraction grating in the visible range is observed.…”

Section: Results Of Experimental Studiesmentioning

confidence: 99%

Features of changes in the nanostructure and colorizing of copper during scanning with a femtosecond laser beam

2017

View full text Add to dashboard Cite

We have studied the nanostructuring and colorizing of the copper surface by scanning with a femtosecond laser beam with a near-Gaussian beam profile. The experimental studies were conducted using a femtosecond laser comprising a Ti:Sapphire oscillator and a multi-pass amplifier with the maximum pulse energy of 0.7 mJ, pulse frequency of 1 kHz, and pulse duration <30 fs. It is shown that the use of a short-pulsed femtosecond laser leads to the formation of wavelength scale periodic surface structures and eventually increases the brightness of the color of the copper surface. It is revealed that via reciprocally scanning the copper surface by multiple ultrashort laser pulses with a weakly asymmetric spatial energy density distribution and an energy density below the material ablation threshold, it is possible to create a combined nanostructure composed of low-spatial-frequency laser-induced periodic surface structures coated with nanoscale roughness. It is shown that relatively minor changes in the nanostructures obtained by scanning the copper surface by multiple ultrashort laser pulses can lead to a significant change in the color during surface colorizing.Keywords: femtosecond laser beam, copper colorizing, nanostructure, forward and reverse scanning, energy density.Citation: Liedl G, Pospichal R, Murzin SP. Features of changes in the nanostructure and colorizing of copper during scanning with a femtosecond laser beam.

show abstract

Femtosecond laser nanostructuring of titanium metal towards fabrication of low-reflective surfaces over broad wavelength range

Cited by 51 publications

References 46 publications

Growth mechanisms of multiscale, mound-like surface structures on titanium by femtosecond laser processing

Growth mechanisms of multiscale, mound-like surface structures on titanium by femtosecond laser processing

Multiscale Hierarchical Micro/Nanostructures Created by Femtosecond Laser Ablation in Liquids for Polarization-Dependent Broadband Antireflection

Features of changes in the nanostructure and colorizing of copper during scanning with a femtosecond laser beam

Contact Info

Product

Resources

About