Ultrafast laser nanostructuring in bulk silica, a “slow” microexplosion

Bhuyan, M. K.; Somayaji, Madhura; Mermillod–Blondin, Alexandre; Bourquard, Florent; Colombier, Jean‐Philippe; Stoian, Razvan

doi:10.1364/optica.4.000951

Cited by 62 publications

(65 citation statements)

References 32 publications

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“…The results obtained by Bessel beam irradiation in fused silica seem to obey the liquid-phase based scenario. Increasing input energy generates hydrodynamic instabilities and fragmentation of the liquid column [92]. This can be observed in the bottom part of Figure 3(b) where modulated index domain appears, with micron-sized periodicities.…”

Section: Nanocavitationmentioning

confidence: 88%

“…The interaction between ultrafast beams and matter has a dominant nonlinear character, mixing propagation and ionization effects. The non-diffractive Bessel [46,92], employing respectively ultrashort and short pulses.…”

Section: Nonlinear Propagationmentioning

confidence: 99%

“…The range of processes at work can be visualized in a dynamic manner using time-resolved imaging of the interaction region over the whole relaxation cycle. Using speckle-free microscopy based on random laser illumination, Bhuyan et al [92] observed the entire relaxation range for Bessel beam structuring in bulk fused silica upon ultrashort pulse illumination. Figure 5(a) shows the phase contrast image of a single shot low index region as the permanent result of laser irradiation.…”

Section: Negative Index Changes and Void-like Structuresmentioning

confidence: 99%

“…The nanoscale opening in bulk dielectric originates in the material fracture. However, the difference in the timescale for nanoscale damage observed in high Young modulus dielectrics (sub-ns [95]) and strongly coupled glasses (tens-hundreds of ns [92]) indicates a potential balance between two processes; fracture in the solid phase and cavitation in the liquid phase. This balance is driven by the competition between mechanical relaxation and material heating.…”

Section: Negative Index Changes and Void-like Structuresmentioning

confidence: 99%

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High-resolution material structuring using ultrafast laser non-diffractive beams

Stoian

Bhuyan

Rudenko

et al. 2019

Advances in Physics: X

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Scales in the 100 nm range represent a generic cornerstone for laser material processing, enabling novel size-dependent functions on surfaces and in the bulk and thus a new range of technological applications. On these scales, the processed material acquires optical, transport or contact properties that do not only rely on local effects on singular topographic features but involve increasingly collective behaviors. Rapid access to sub-100 nm features with intense coherent light represents nevertheless a challenge in laser structuring in view of the optical diffraction limit. Ultrafast non-diffractive beams with controllable time envelopes can overcome this limit and achieve super-resolved processing, a prerequisite for the next generation of flexible and precise material processing tools. They show a remarkable capacity of structuring transparent materials with high degree of accuracy and exceptional aspect ratio. This capacity relies on triggering fast hydrodynamic and material fracture effects with characteristic spatial scales in the nm range. Reviewing the present achievements and technical potential, we discuss from a dynamic viewpoint the physical mechanisms enabling structural features beyond diffraction limit achieved using ultrafast Bessel beams and indicate applications of high technical relevance. ARTICLE HISTORY

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Section: Nanocavitationmentioning

confidence: 88%

Section: Nonlinear Propagationmentioning

confidence: 99%

Section: Negative Index Changes and Void-like Structuresmentioning

confidence: 99%

Section: Negative Index Changes and Void-like Structuresmentioning

confidence: 99%

See 2 more Smart Citations

High-resolution material structuring using ultrafast laser non-diffractive beams

Stoian

Bhuyan

Rudenko

et al. 2019

Advances in Physics: X

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“…Positive type I and negative type II index modifications are associated, respectively, to local densification and expansion. While laser‐induced local expansion can have a thermodynamic origin, as the local temperature increases sufficiently to melt the glass or drive a thermal expansion in solid phase, this is presumably not the case of ultrafast laser‐induced local densification, which is mainly a purely photo‐induced effect. It has been reported in the literature that the capability of a ChG glass structure to evolve toward strongly or weakly densified regions, when irradiated with ultrafast laser pulses, depends on its initial structural flexibility (or more specifically, constraints imposed to the structural flexibility), where a high or low degree of flexibility is associated, respectively, to a high or low initial volume (or enthalpy), and it is strongly linked to the connectivity of the microscopic glass structure .…”

Section: Laser‐induced Local Densification Under Thermal Treatmentmentioning

confidence: 99%

Influence of Thermal Annealing on Ultrafast Laser‐Induced Local Densification in Bulk Sulfur‐Based Chalcogenide Glasses

Somayaji

D’Amico

et al. 2018

Physica Status Solidi (a)

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The response to focused ultrafast laser pulses, of three bulk sulfur‐based chalcogenide glasses, gallium lanthanum sulfide (GLS) and two germanium arsenic sulfide with different stoichiometry (Ge20As20S60 and Ge15As15S70), is studied as a function of a thermal treatment made by several annealing cycles under the glass transition temperature. It is demonstrated that the annealing procedure has a considerable influence on the ultrafast laser‐induced local densification process of the quenched glasses. Using post‐mortem phase contrast microscopy and single‐mode light guiding measurements on photo‐inscribed waveguides, the influence of the thermal history on the laser‐induced positive refractive index changes (local densification) is determined. In particular it is shown that, in the case of the Ge20As20S60 glass, the threshold of ultrafast laser‐induced densification in terms of laser energetic dose is considerably lowered after the first annealing cycle. In the light of this result, the activation of a new relaxation channel during the thermal treatment and its influence on the laser‐induced densification process of Ge‐As‐S glasses is discussed. Potential of material thermal pre‐treatment for developing efficient photo‐inscription techniques in the domain of integrated photonics is also discussed.

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Near‐Field Mediated 40 nm In‐Volume Glass Fabrication by Femtosecond Laser

Yan

Gao

Beresna

et al. 2021

Advanced Optical Materials

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Nanofabrication techniques have significantly impelled the development of nanomechanics and nanophotonics by making nano‐precision material processing routine. Although widely employed, current sub‐100 nm nanofabrication approaches based on focused particles or light are limited to surface modification. Here, an optical in‐volume fabrication approach that enables 3D glass processing with a spatial resolution down to 40 nm is demonstrated. Such an approach is based on the formation of a single nanoslit structure induced by femtosecond laser pulses. Spatially‐variant nanopatterns with uniform line‐widths are then formed by a near‐field mediated intensity redistribution of incident light. The redistribution of electromagnetic field induced by the presence of the nanoslit leads to a positive‐feedback self‐assembly process. The self‐assembly process allows achieving spacing one order of magnitude smaller than the laser beam size. In addition, a tilted ablation front that results in the generation of structures with curved morphology is revealed. The proposed approach enables 3D patterning with a lateral spacing down to 200 nm and 5D optical data storage with an equivalent capacity of 7.2 TB per disk, demonstrating its feasibility for 3D nanoscale processing in bulk materials.

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Ultrafast laser nanostructuring in bulk silica, a “slow” microexplosion

Cited by 62 publications

References 32 publications

High-resolution material structuring using ultrafast laser non-diffractive beams

High-resolution material structuring using ultrafast laser non-diffractive beams

Influence of Thermal Annealing on Ultrafast Laser‐Induced Local Densification in Bulk Sulfur‐Based Chalcogenide Glasses

Near‐Field Mediated 40 nm In‐Volume Glass Fabrication by Femtosecond Laser

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