UV-laser-induced densification of fused silica: a molecular dynamics study

Zheng, Lianqing; Lambropoulos, John C.; Schmid, Ansgar W.

doi:10.1016/j.jnoncrysol.2004.07.062

Cited by 26 publications

(29 citation statements)

References 41 publications

(49 reference statements)

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“…Such phenomenon is important because it has not been identified from BKS-based MD studies. 8 On the other hand, the decrease of Si-O bond length has been experimentally confirmed in 355-nm irradiated silica samples. 20 For the other PDFs, the primary peak of the Si-Si PDF (FIG.…”

Section: -3mentioning

confidence: 92%

“…6 Wootton and Zheng modeled laser absorption as adding extra kinetic energy to bonded Si-O pairs to produce densifications. 7,8 In the latter approach, laser excitation functions as a highly localized recoil, in which process the absorbed energy initiates an instantaneous disruption in the lattice and allows the atoms to move towards the nearest minima of the ground state potential energy surface through subsequent a corresponding author. Email: Jincheng.du@unt.edu b corresponding author.…”

confidence: 99%

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UV-induced modification of fused silica: Insights from ReaxFF-based molecular dynamics simulations

Tian

et al. 2016

AIP Advances

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Atomic structural modification and defect processes of fused silica resulting from UV-laser irradiation are studied by a combination of molecular dynamics (MD) simulations and the Reactive Force Field (ReaxFF). Bond state transitions by laser excitation are modeled as the result of localized recoils during energy deposition. Computations of pair distribution functions and bond angle distributions of the irradiated structure reveal that fused silica undergoes significant changes in terms of Si-O, Si-Si pair distances and Si-O-Si bond angles, which are attributed to the formation of silicon and oxygen coordination defects. It is found that nonbridging oxygen is responsible for the decreased Si-O bond length, while laser-induced five-coordinated silicon leads to small Si-O-Si bond angles in 2-membered rings.

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Section: -3mentioning

confidence: 92%

confidence: 99%

UV-induced modification of fused silica: Insights from ReaxFF-based molecular dynamics simulations

Tian

et al. 2016

AIP Advances

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“…It is usually reported that the D1 intensity increases with density but, in these cases, the bare amplitude of the D1 peak is often reported without deconvolution of the main band. Note that molecular dynamics simulations [24] usually predict an increased number of 4-membered rings. It should be noted [24] that even in very low-quantities (typically a few %) 3-tetrahedra cycles lead to a distinctive signature in the Raman data.…”

Section: Micro-raman Analysismentioning

confidence: 99%

“…Note that molecular dynamics simulations [24] usually predict an increased number of 4-membered rings. It should be noted [24] that even in very low-quantities (typically a few %) 3-tetrahedra cycles lead to a distinctive signature in the Raman data.…”

Section: Micro-raman Analysismentioning

confidence: 99%

Scanning thermal microscopy and Raman analysis of bulk fused silica exposed to lowenergy femtosecond laser pulses

Bellouard¹,

Barthel²,

Said³

et al. 2008

Opt. Express

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Low energy femtosecond laser pulses locally increase the refractive index and the hydro-fluoric acid etching rate of fused silica. These phenomena form the basis of a direct-write method to fabricate integrated glass devices that are of particular interest for optofluidics and optomechanical applications. Yet the underlying physical mechanism behind these effects remains elusive, especially the role of the laser polarization. Using Scanning Thermal Microscope and Raman spectrometer we observe in laser affected zones, a localized sharp decrease of the thermal conductivity correlated with an increased presence of low-number SiO 2 cycles. In addition, we find that a high correlation exists between the amount of structural changes and the decrease of thermal conductivity. Furthermore, sub-wavelength periodic patterns are detected for high peak power exposures. Finally, our findings indicate that, to date, the localized densification induced by femtosecond laser pulses remains well below the theoretical value achievable in mechanically densified silica.

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“…In our previous paper [11], we investigated the effects of UV-laser irradiation on fused silica using classical molecular dynamics (MD). The effect of laser irradiation was modeled as photon energy transfer to the kinetic energy of bonded silicon and oxygen atoms and a twobody potential for silica was used.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics study of UV-laser-induced densification of fused silica. II. Effects of laser pulse duration, pressure, and temperature, and comparison with pressure-induced densification

Zheng

Lambropoulos

Schmid

2005

Journal of Non-Crystalline Solids

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UV-laser-induced densification of fused silica: a molecular dynamics study

Cited by 26 publications

References 41 publications

UV-induced modification of fused silica: Insights from ReaxFF-based molecular dynamics simulations

UV-induced modification of fused silica: Insights from ReaxFF-based molecular dynamics simulations

Scanning thermal microscopy and Raman analysis of bulk fused silica exposed to lowenergy femtosecond laser pulses

Molecular dynamics study of UV-laser-induced densification of fused silica. II. Effects of laser pulse duration, pressure, and temperature, and comparison with pressure-induced densification

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