Experimental and computational investigation of confined laser-induced breakdown spectroscopy

Wang, Yun; Yuan, Hao; Fu, Yang; Wang, Zhe

doi:10.1016/j.sab.2016.10.015

Cited by 37 publications

(13 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Despite their accuracy and fundamental appeal, kinetic models remain impractical for simulations out to several centimeters and microsecond timescales [23]. Fluid models employing the assumption of local thermodynamic equilibrium (LTE) are the most popular [24], while two-temperature models have also been evaluated [22,25].…”

Section: Model Descriptionmentioning

confidence: 99%

Laser-generated plasmas in length scales relevant for thin film growth and processing: simulation and experiment

Harris¹,

Paiste²,

Holdsworth³

et al. 2019

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

In pulsed laser deposition, thin film growth is mediated by a laser-generated plasma, whose properties are critical for controlling the film microstructure. The advent of 2D materials has renewed the interest in how this ablation plasma can be used to manipulate the growth and processing of atomically thin systems. For such purpose, a quantitative understanding of the density, charge state, and kinetic energy of plasma constituents is needed at the location where they contribute to materials processes. Here we study laser-induced plasmas over expansion distances of several centimeters from the ablation target, which is the relevant length scale for materials growth and modification. The study is enabled by a fast implementation of a laser ablation/plasma expansion model using an adaptive Cartesian mesh solver. Simulation outcomes for KrF excimer laser ablation of Cu are compared with Langmuir probe and optical emission spectroscopy measurements. Simulation predictions for the plasma-shielding threshold, the ionization state of species in the plasma, and the kinetic energy of ions, are in good correspondence with experimental data. For laser fluences of 1-4 J/cm 2 , the plume is dominated by Cu 0 , with small concentrations of Cu + and electrons at the expansion front. Higher laser fluences (e.g., 7 J/cm 2 ) lead to a Cu + -rich plasma, with a fully ionized leading edge where Cu 2+ is the dominant species. In both regimes, simulations indicate the presence of a low-density, high-temperature plasma expansion front with a high degree of ionization that may play a significant role in doping, annealing, and kineticallydriven phase transformations in 2D materials.

show abstract

Section: Model Descriptionmentioning

confidence: 99%

Laser-generated plasmas in length scales relevant for thin film growth and processing: simulation and experiment

Harris¹,

Paiste²,

Holdsworth³

et al. 2019

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…The external influence can be either 1) passive based on controlled environmental parameters, e.g. i) ambient pressures and/or atmosphere 14 , ii) transverse external magnetic field 15 , iii) plasma spatial confinement 16,17 , or 2) active, e.g. i) an ablation combined with fast electric discharge 18 or ii) microwave assisted LIBS 19 .…”

Section: Introductionmentioning

confidence: 99%

Triple-pulse LIBS: laser-induced breakdown spectroscopy signal enhancement by combination of pre-ablation and re-heating laser pulses

Procházka

Pořízka

Novotný

et al. 2020

J. Anal. At. Spectrom.

View full text Add to dashboard Cite

show abstract

“…At the laser energy of 24 mJ, the enhancement ratio is approximately 2. The reason is that spatial confinement can enhance spectral intensity due to the compression of plasma plume by reflected shockwave [29,30,39,40]. The ambient air pressure around the surface of laser ablated sample increases rapidly, therefore, a shockwave is generated.…”

Section: Resultsmentioning

confidence: 99%

“…The spectral enhancement was attributed to the reflection of the shock wave by the wall. Wang et al presented an experimental and computational study on LIBS for both unconfined flat surface and confined cavity cases [30]. Li et al investigated the spatial confinement of plasma by using time resolved spectroscopy, fast imaging, interferometry, and numerical computation.…”

Section: Introductionmentioning

confidence: 99%

Effect of distances between lens and sample surface on laser-induced breakdown spectroscopy with spatial confinement

Jiang¹,

Shao²,

Wang³

2018

Plasma Sci. Technol.

View full text Add to dashboard Cite

Spatial confinement can significantly enhance the spectral intensity of laser-induced plasma in air. It is attributed to the compression of plasma plume by the reflected shockwave. In addition, optical emission spectroscopy of laser-induced plasma can also be affected by the distance between lens and sample surface. In order to obtain the optimized spectral intensity, the distance must be considered. In this work, spatially confined laser-induced silicon plasma by using a Nd: YAG nanosecond laser at different distances between lens and sample surface was investigated. The laser energies were 12 mJ, 16 mJ, 20 mJ, and 24 mJ. All experiments were carried out in an atmospheric environment. The results indicated that the intensity of Si (I) 390.55 nm line firstly rose and then dropped with the increase of lens-to-sample distance. Moreover, the spectral peak intensity with spatial confinement was higher than that without spatial confinement. The enhancement ratio was approximately 2 when laser energy was 24 mJ.

show abstract

Experimental and computational investigation of confined laser-induced breakdown spectroscopy

Cited by 37 publications

References 30 publications

Laser-generated plasmas in length scales relevant for thin film growth and processing: simulation and experiment

Laser-generated plasmas in length scales relevant for thin film growth and processing: simulation and experiment

Triple-pulse LIBS: laser-induced breakdown spectroscopy signal enhancement by combination of pre-ablation and re-heating laser pulses

Effect of distances between lens and sample surface on laser-induced breakdown spectroscopy with spatial confinement

Contact Info

Product

Resources

About