Oriented creation of anisotropic defects by IR femtosecond laser scanning in silica

Lancry, Matthieu; Poumellec, Bertrand; Desmarchelier, Rudy; Bourguignon, Bernard

doi:10.1364/ome.2.001809

Cited by 15 publications

(16 citation statements)

References 56 publications

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“…Electrons relax first into self‐trapped excitons (STE) by electron–phonon coupling (this takes a few 10s ps) and then annihilate radiatively (lifetime of nanoseconds at room temperature) or not (coupling with lattice phonons), or transform into point defects (e.g. into SiE’ and NBOHC (bond breaking) and then into a silicium oxygen deficient center SiODC(II)) following the reaction scheme sketched below:

…”

Section: Discussionmentioning

confidence: 99%

“…We hypothesize that point defects, even if they are not the most efficient relaxation pathway are good candidates for recording medium . Finally, decomposition of silica leads to SiODC(II) defect formation , which may behave as electron source for the ionization induced by the next pulse. Therefore, in the process of multiphoton ionization, these centers with an occupied level in the forbidden gap are expected to be readily ionized first, contributing to plasma nanostructure formation.…”

Section: Discussionmentioning

confidence: 99%

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Ultrafast nanoporous silica formation driven by femtosecond laser irradiation

Lancry

Poumellec

Canning

et al. 2013

Laser & Photonics Reviews

166

149

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A type of glass modifications occurring after femto‐second laser irradiation gives rise to strong (10−2) from birefringence. This form birefringence is thought to be related to index nanostructure (called nanogratings). Analyzing induced tracks in fused silica using scanning electron microscopy (SEM) with nm resolution shows that nanostructures are porous nanoplanes with an average index lower than typical silica (Δn ∼ –0.20). Their origin is explained as arising from fast decomposition of the glass under localized, high‐intensity femtosecond laser radiation where strong nonlinear, multiphoton‐induced photoionization leads to plasma generation. Mechanistic details include Coulombic explosions characteristic of strong photoionization and the production of self‐trapped exciton (STE). Rapid relaxation of these STE prevents recombination and dissociated atomic oxygen instead recombines with each other to form molecular oxygen pointed out using Raman microscopy. Some of it is dissolved in the condensed glass whilst the rest is trapped within nanovoids. A chemical recombination can only occur at 1200 °C for many hours. This explains the thermal stability of such a nanostructure. Precise laser translation and control of these birefringent nanoporous structures allo arbitrarily tuning and positioning within the glass, an important tool for controlling optical properties for photonic applications, catalysts, molecular sieves, composites and more.

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…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Ultrafast nanoporous silica formation driven by femtosecond laser irradiation

Lancry

Poumellec

Canning

et al. 2013

Laser & Photonics Reviews

166

149

View full text Add to dashboard Cite

show abstract

“…The quill writing effect depends strongly on the focus depth of the laser irradiation beneath the sample surface and the scanning speed [352,436]. Scanning direction also affects the etching rate of the inscribed lines and luminescence of the femtosecond laser induced color centers [440,441].…”

Section: Quill Writing Anisotropic Photosensitivity and Their Mechanmentioning

confidence: 99%

Femtosecond laser induced phenomena in transparent solid materials: Fundamentals and applications

Tan

Sharafudeen

Yue

et al. 2016

Progress in Materials Science

247

167

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“…Additionally, two intense absorption bands can be distinguished at short wavelengths, which are attributed to SiE' centers at 210 nm (≡Si, an unpaired electron in a silicon atom bound to three oxygen atoms), and oxygen deficiency center (ODC)(II) at 245 nm, (-O-Si-O-, a divalent silicon atom) [27,28]. A detailed description of their formation mechanism is given in [29].…”

Section: Loss and Birefringence Dispersionmentioning

confidence: 99%

Compact Birefringent Waveplates Photo-Induced in Silica by Femtosecond Laser

et al. 2014

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Recently, we showed that femtosecond laser induced "nanogratings" consist of thin regions with a low refractive index (Δn = −0.15), due to the formation of nanoporous silica surrounded by regions with a positive index change. In this paper, we investigate a wide range of laser parameters to achieve very high retardance within a single layer; as much as 350 nm at λ = 546 nm but also to minimize the competing losses. We show that the total retardance depends on the number of layers present and can be accumulated in the direction of laser propagation to values higher than 1600 nm. This opens the door to using these nanostructures as refined building blocks for novel optical elements based on strong retardance.

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Oriented creation of anisotropic defects by IR femtosecond laser scanning in silica

Cited by 15 publications

References 56 publications

Ultrafast nanoporous silica formation driven by femtosecond laser irradiation

Ultrafast nanoporous silica formation driven by femtosecond laser irradiation

Femtosecond laser induced phenomena in transparent solid materials: Fundamentals and applications

Compact Birefringent Waveplates Photo-Induced in Silica by Femtosecond Laser

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