Effect of the laser pulse width on the field evaporation behavior of metals and oxides

Wang, H.; Houard, Jonathan; Arnoldi, L.; Hideur, Ammar; Silaeva, Elena P.; Déconihout, B.; Vella, A.

doi:10.1016/j.ultramic.2015.09.009

Cited by 9 publications

(6 citation statements)

References 32 publications

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“…As shown in Figure , the critical intensity is proportional to 1/ τ p , indicating that the effective cross section does not depend on the duration in this region. This explains the experimental observation that the laser pulse duration does not affect the evaporation behavior while keeping the same pulse energy . Moreover, σ e remains the same at different intensities, so energy absorption is first-order.…”

Section: Resultsmentioning

confidence: 61%

“…This explains the experimental observation that the laser pulse duration does not affect the evaporation behavior while keeping the same pulse energy. 46 Moreover, σ e remains the same at different intensities, so energy absorption is first-order. The absorbed energy can be simply rewritten as Q = Jσ e , where J = I 0 τ p is the laser fluence.…”

Section: Resultsmentioning

confidence: 99%

“…Although much longer pulses were used in most APT experiments, it has been reported that such short pulses were used on Si and MgO. 46 The peak laser field F 0 is increased at a given F dc until field evaporation occurs. The critical peak laser intensity I c (proportional to the square of the critical peak laser field F c ) as a function of F dc is given in Figure 4.…”

Section: Resultsmentioning

confidence: 99%

“…The pulse duration is set as τ p = 50 fs due to the high cost of computational time. Although much longer pulses were used in most APT experiments, it has been reported that such short pulses were used on Si and MgO . The peak laser field F 0 is increased at a given F dc until field evaporation occurs.…”

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

Theoretical Insights into Energy Absorption and Charge Draining during Field Evaporation Assisted by Femtosecond Laser Pulses

et al. 2021

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Manipulation of laser-assisted field evaporation taking place at a sub-picosecond time scale relies on a full understanding of the dynamics at a microscopic level. We use first-principles methods to investigate the mechanism of energy absorption and charge draining during fast evaporation of silicon in a high electrostatic field with ultrafast-laser illumination. The results show that laser energy absorption to trigger field evaporation can be described by an effective cross section, which depends on the photon frequency and the static field strength. The cross section is not affected by pulse duration or laser intensity, indicating that the absorption is first-order. It is found that the charge state of the evaporating ion fluctuates due to the collective excitation of electrons. The average charge state does not depend on laser parameters but only on the static field strength, in agreement with experimental observations. Our work provides theoretical insights into the manipulation of modern atom probe tomography and other ultrafast-laser-induced phenomena in high electric fields.

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Section: Resultsmentioning

confidence: 61%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Theoretical Insights into Energy Absorption and Charge Draining during Field Evaporation Assisted by Femtosecond Laser Pulses

et al. 2021

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“…For example, the surface evolution is difficult to predict when the relative evaporation fields of materials are unknown, which could be the case for a very complex materials system. Moreover, despite multiple attempts to unravel the entire process, there is still insufficient understanding of the laser coupling in complex systems as well as the heat propagation to accurately predict its impact on the temperature and hence the emitter shape (Oberdorfer et al, 2007;Vurpillot et al, 2009;Koelling et al, 2011;Bogdanowicz et al, 2013Bogdanowicz et al, , 2018Vella, 2013;Vella et al, 2013;Bogdanowicz & Vandervorst, 2014;Shinde et al, 2016;Wang et al, 2016;Di Russo et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

The Prospect of Spatially Accurate Reconstructed Atom Probe Data Using Experimental Emitter Shapes

Beeck

Scheerder

Geiser

et al. 2022

Microscopy and Microanalysis

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Reliable spatially resolved compositional analysis through atom probe tomography requires an accurate placement of the detected ions within the three-dimensional reconstruction. Unfortunately, for heterogeneous systems, traditional reconstruction protocols are prone to position some ions incorrectly. This stems from the use of simplified projection laws which treat the emitter apex as a spherical cap, although the actual shape may be far more complex. For instance, sampled materials with compositional heterogeneities are known to develop local variations in curvature across the emitter due to their material phase specific evaporation fields. This work provides three pivotal precursors to improve the spatial accuracy of the reconstructed volume in such cases. First, we show scanning probe microscopy enables the determination of the local curvature of heterogeneous emitters, thus providing the essential information for a more advanced reconstruction considering the actual shape. Second, we demonstrate the cyclability between scanning probe characterization and atom probe analysis. This is a key ingredient of more advanced reconstruction protocols whereby the characterization of the emitter topography is executed at multiple stages of the atom probe analysis. Third, we show advances in the development of an electrostatically driven reconstruction protocol which are expected to enable reconstruction based on experimental tip shapes.

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Laser‐Based Selective Material Processing for Next‐Generation Additive Manufacturing

Park,

Bui

et al. 2023

Advanced Materials

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The connection between laser‐based material processing and additive manufacturing is quite deeply rooted. In fact, the spark that started the field of additive manufacturing was the idea that two intersecting laser beams could selectively solidify a vat of resin. Ever since, laser has been accompanying the field of additive manufacturing, with its repertoire expanded from processing only photopolymer resin to virtually any material, allowing liberating customizability. As a result, additive manufacturing is expected to take an even more prominent role in the global supply chain in years to come. Herein, an overview of laser‐based selective material processing is presented from various aspects: the physics of laser‐material interactions, the materials currently used in additive manufacturing processes, the system configurations that enable laser‐based additive manufacturing, and various functional applications of next‐generation additive manufacturing. Additionally, current challenges and prospects of laser‐based additive manufacturing are discussed.This article is protected by copyright. All rights reserved

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Effect of the laser pulse width on the field evaporation behavior of metals and oxides

Cited by 9 publications

References 32 publications

Theoretical Insights into Energy Absorption and Charge Draining during Field Evaporation Assisted by Femtosecond Laser Pulses

Theoretical Insights into Energy Absorption and Charge Draining during Field Evaporation Assisted by Femtosecond Laser Pulses

The Prospect of Spatially Accurate Reconstructed Atom Probe Data Using Experimental Emitter Shapes

Laser‐Based Selective Material Processing for Next‐Generation Additive Manufacturing

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