Chinese Journal of Lasers, Volume. 48, Issue 14, 1402019(2021)
Mechanism of Femtosecond Laser-Induced Breakdown Mediated by Al/SiO2 Core/Shell Nanostructures
Figures & Tables(11)
Fig. 1. Al/SiO2 core/shell nanostructure and its meshing. (a) Mesh structure; (b) Al/SiO2 core-shell nanostructure
Fig. 4. Relative enhancement factor of electric field ξ for different morphology of Al/SiO2 core/shell nanoparticles in water. (a1)(a2) Monomer and its XZ cross section; (b1)(b2) dimer and its XZ cross section; (c1)(c2) trimer and its XZ cross section
Fig. 5. Proposed nanostructure and relative enhancement factor of electric field ξ at the center line of the nanostructure along Z-axis. (a) Proposed nanostructure; (b) relative enhancement factor of electric field ξ
Fig. 6. Extinction cross-section for monomer, dimer and trimer of Al/SiO2 core/shell nanoparticles
Fig. 7. Evolution of plasma electron density for different morphology of Al/SiO2 core/shell nanoparticles. (a) Monomer; (b) dimer; (c) trimer
Fig. 8. Lattice temperature of different morphology of Al/SiO2 core/shell nanoparticles at corresponding laser breakdown fluence at t=1200 fs. (a) Monomer; (b) dimer; (c) trimer
Fig. 9. Evolution of lattice temperature of different morphology of Al/SiO2 core/shell nanoparticles
Table 1. Parameters used in multi-physical fields coupling model
View tableTable 1. Parameters used in multi-physical fields coupling model
Parameter Value Description λ /nm 580 Laser wavelength c0 /(m·s-1) 3×108 Speed of light in vacuum ω 2πc0/λ Angular frequency ε0 /(F·m-1) 8.85×10-12 Vacuum permittivity tp /fs 300 Laser pulse width [full width at half maximum (FWHM)] e /C 1.6×10-19 Electron charge mw /kg 3×10-26 Mass of water molecule ms /kg 9.9765×10-26 Mass of silica molecule me /kg 9.10938291× 10-31 Electron mass m's 0.86me Effective silica electron mass[ 24 ]m'w 0.5me Effective water electron mass[ 12 ,14 ]τ /fs 1.6 Mean free time between electron/molecule collisions[ 25 ]/ ( J·s) 1.0545718×10-34 Reduced Planck constant Ew,gap /eV 6.5 Band gap energy of water[ 26 ]Es,gap /eV 9 Band gap energy of silica[ 27 ]ρw,bound /cm-3 6.68×1022 Bound electron density of water[ 12 ]ρs,bound /cm-3 2.2×1022 Bound electron density of silica[ 27 ]nw 1.33 Refractive index of water ns 1.45 Refractive index of silica ηrec /(cm3·s-1) 2×10-9 Empirical recombination rate[ 28 ]q0 /(W·m-2·K-1) 133.4×106 Thermal conductance at aluminum-silica interface[ 29 ]q1 /(W·m-2·K-1) 1000×106 Thermal conductance at silica-water interface[ 30 ]ρs /(kg·m-3) 2203 Density of silica ρw /(kg·m-3) 1000 Density of water cs /(J·kg-1·K-1) 703 Heat capacity of silica cw /(J·kg-1·K-1) 4184 Heat capacity of water ks /(W·m-1·K-1) 1.38 Thermal conductivity of silica kw /(W·m-1·K-1) 0.61 Thermal conductivity of water
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Qing Lin, Naifei Ren, Anran Song, Guangzhi Xia. Mechanism of Femtosecond Laser-Induced Breakdown Mediated by Al/SiO2 Core/Shell Nanostructures[J]. Chinese Journal of Lasers, 2021, 48(14): 1402019
Paper Information
Category: laser manufacturing
Received: Nov. 26, 2020
Accepted: Jan. 27, 2021
Published Online: Jul. 14, 2021
The Author Email: Qing Lin (linqing@squ.edu.cn)
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