Mechanisms of formation of sub- and micrometre-scale holes in thin metal films by single nano- and femtosecond laser pulses

Данилов, П. А.; Zayarnyĭ, D A; Ионин, А. А.; Kudryashov, S. I.; Makarov, Sergey; Rudenko, A. A.; Yurovskikh, V. I.; Kulchin, Yu. N.; Vitrik, Oleg B.; Kuchmizhak, Aleksandr; Drozdova, Ekaterina A.; Одиноков, С. Б.

doi:10.1070/qe2014v044n06abeh015426

Cited by 26 publications

(6 citation statements)

References 47 publications

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“…By measuring the intensity of laser light transmitted through the probe hole, this technique allows to find the intensity of the laser light that reaches the surface after attenuation in plasma I 0 (t)exp[−θ(t)] (see figure 4) and optical thickness of the laserinduced plasma. We note that the transient plasma can defocus the incident laser beam at high laser fluences [47], significantly complicating theoretical treatment of the laser light reflection.…”

Section: Resultsmentioning

confidence: 99%

Laser wavelength effect on nanosecond laser light reflection in ablation of metals

et al. 2016

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Reflection of nanosecond laser pulses with different wavelengths (1.06 and 0.69 µm) in ablation of titanium in air is studied experimentally. The laser wavelength effect on reflection is essential at low laser fluence values. However, it becomes negligible for laser fluence values by about an order of magnitude higher than the plasma ignition threshold. We speculate that the disappearance of the wavelength effect is explained by counteracting processes of the laser light absorption in plasma, which increases with laser wavelength, and absorption in the surface layer, which decreases with increasing laser wavelength.

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Section: Resultsmentioning

confidence: 99%

Laser wavelength effect on nanosecond laser light reflection in ablation of metals

et al. 2016

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“…Specifically, in the cases of bumps and holes t bump ≈ (D 2 1/e,bump − D 2 1/e,f oc )/4χ ≈ 1 ns and t hole ≈ (D 2 1/e,hole − D 2 1/e,f oc )/4χ ≈ 10 ns, respectively, for the thermal diffusivity coefficient of solid gold χ ≈ 1.2 cm 2 /s, being comparable to previous similar estimates. 26,27 Series of side-view SEM images (Fig. 2(a-e)) demonstrate the central cross-section cuts of the different structures produced on the surface of the Au film at the increasing pulse energy (each presented image illustrates the cut of one of the surface structure previously shown in Fig.…”

Section: Experimental Study Of Nanoscale Translative Mass Redistribut...mentioning

confidence: 94%

Laser-Induced Translative Hydrodynamic Mass Snapshots: Noninvasive Characterization and Predictive Modeling via Mapping at Nanoscale

Wang

Kuchmizhak

et al. 2017

Phys. Rev. Applied

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Nanoscale thermally assisted hydrodynamic melt perturbations induced by ultrafast laser energy deposition in noble-metal films produce irreversible nanoscale translative mass redistributions and results in formation of radially-symmetric frozen surface structures. We demonstrate that the final three-dimensional (3D) shape of the surface structures formed after re-solidification of the molten part of the film is governed by incident laser fluence and, more importantly, predicted theoretically via molecular dynamics modeling. Considering the underlying physical processes associated with laser-induced energy absorption, electron-ion energy exchange, acoustic relaxation and hydrodynamic flows, the theoretical approach separating "slow" and "fast" physical processes and combining hybrid analytical two-temperature calculations, scalable molecular-dynamics simulations, and a semi-analytical thin-shell model was shown to provide accurate prediction of the final nanoscale solidified morphologies, fully consistent with direct electron-microscopy visualization of nanoscale focused ion-beam cuts of the surface structures produced at different incident laser fluences. Finally, these results are in reasonable quantitative agreement with mass distribution profiles across the surface nanostructures, provided by their noninvasive and non-destructive nanoscale characterization based on energy-dispersive x-ray fluorescence spectroscopy, operating at variable electron-beam energies.

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“…Comparing to elaborate, multi-step nanofabrication processes, diverse miscroscale surface patterns-e.g. arrays of microholes or microbumps in thin films of plasmonic metals-can be readily directly printed with a high throughput by focused single nano-or femtosecond laser pulses [13][14][15][16], coming at (sub) MHz repetition rates [17].…”

Section: Introductionmentioning

confidence: 99%

Background-free, highly sensitive surface-enhanced IR absorption of rhodamine 6G molecules deposited onto an array of microholes in thin silver film

et al. 2016

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Selective IR absorption at 1261 cm −1 enhanced by 455 times, was demonstrated for rhodamine 6G molecules, covering a 2D-photonic crystal, represented by a regular array of 4-micron wide holes in a 30 nm thick silver film on a CaF 2 substrate. The reference absorption lines were taken near 2900 cm −1 , where the IR radiation is freely channeling through the microholes, indicating the reference substrate coverage by the dye molecules for its relative internal calibration. The limit of background-free detection for the analyte was determined at the level ~10 −2 monolayer.

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Mechanisms of formation of sub- and micrometre-scale holes in thin metal films by single nano- and femtosecond laser pulses

Cited by 26 publications

References 47 publications

Laser wavelength effect on nanosecond laser light reflection in ablation of metals

Laser wavelength effect on nanosecond laser light reflection in ablation of metals

Laser-Induced Translative Hydrodynamic Mass Snapshots: Noninvasive Characterization and Predictive Modeling via Mapping at Nanoscale

Background-free, highly sensitive surface-enhanced IR absorption of rhodamine 6G molecules deposited onto an array of microholes in thin silver film

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