Multilevel data writing in nanoporous glass by a few femtosecond laser pulses

Lipatiev, Alexey S.; Fedotov, S. S.; Охримчук, А. Г.; Lotarev, S. V.; Vasetsky, Alexey M.; Степко, А. А.; Shakhgil’dyan, G. Yu.; Piyanzina, K. I.; Glebov, Ivan; Сигаев, В. Н.

doi:10.1364/ao.57.000978

Cited by 23 publications

(8 citation statements)

References 26 publications

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“…They are oriented perpendicular to the plane of polarization of the writing beam and exhibiting form birefringence which can be used for the data encoding (Zhang et al, 2014). In order to increase data writing speed, it was proposed to use nanoporous SiO 2 glass as storage media instead of silica glass (Fedotov et al, 2018;Lipatiev et al, 2018a). In this case, birefringent sub-micron hollow cavities were formed under the action of ultrafast laser pulses.…”

Section: Direct Laser Writing In Glass and Redistribution Of Elementsmentioning

confidence: 99%

Glass: Home of the Periodic Table

et al. 2020

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Glass is the most common material around us, and humankind uses it every day for more than 5000 years. However, from the chemical point of view, glass is the only material that could represent almost all elements of the Periodic Table inside itself, showing the effect of the Periodic Law on properties of the final material. In this paper, we show the most remarkable examples demonstrating that glass can rightfully be called "home" for all chemical elements providing different properties depending on its composition. We gave a new look at the Periodic Table and described how a small number of glass-forming components creates unique glass structure which could enclose almost all remaining elements including transition and noble metals, lanthanides and actinides as modifying components providing an inconceivable number of discoveries in material science. Moreover, we reviewed a series of studies on the direct femtosecond laser writing in glasses which paves the way for a redistribution of chemical elements in the spatially confined nanosized zone in glass volume providing unique properties of laser-induced structures. Finally, for the first time, we reproduce the Periodic Table in birefringence colors in the bulk of silica glass using a direct laser writing technique. This image of 3.6 × 2.4 mm size can withstand temperature up to 900 • C, humidity, electromagnetic fields, powerful cosmic and reactor radiation and other environmental factors and demonstrates both the art of direct laser writing and symbolic role of glass as the safest and eternal home for the Periodic Table.

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Section: Direct Laser Writing In Glass and Redistribution Of Elementsmentioning

confidence: 99%

Glass: Home of the Periodic Table

et al. 2020

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“…These LIPSS promise wide applications in polarization optics [18,20] and photovoltaics [19,21]. Additionally, the presence of periodic modulation on the surface or inside the bulk of the material opens new prospects on data storage [18,22,23] when several bits can be written within one anisotropically nanostructured voxel. In this case, data storage and subsequent encoding in the same voxel are achieved by direct laser writing of LIPSS with appropriate orientations and optical birefringence values [24].…”

Section: Introductionmentioning

confidence: 99%

Periodic Relief Fabrication and Reversible Phase Transitions in Amorphous Ge2Sb2Te5 Thin Films upon Multi-Pulse Femtosecond Irradiation

Zabotnov

Kolchin

Shuleiko

et al. 2022

Micro

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Ge2Sb2Te5 based devices attract the attention of researchers due to wide opportunities in designing phase change memory. Herein, we studied a possibility to fabricate periodic micro- and nanorelief at surfaces of Ge2Sb2Te5 thin films on silicon oxide/silicon substrates under multi-pulse femtosecond laser irradiation with the wavelength of 1250 nm. One-dimensional lattices with periods of 1250 ± 90 and 130 ± 30 nm were obtained depending on the number of acted laser pulses. Emergence of these structures can be explained by plasmon-polariton generation and laser-induced hydrodynamic instabilities, respectively. Additionally, formation of the lattices whose spatial period is close to the impacted laser wavelength can be modelled by considering the free carrier contribution under intensive photoexcitation. Raman spectroscopy revealed both crystallization and re-amorphization of the irradiated films. The obtained results show a possibility to fabricate rewritable all-dielectric data-storage devices based on Ge2Sb2Te5 with the periodic relief.

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“…The formation of one-dimensional surface structures on the a-Si:H film surface also attracts interest for application in polarization optoelectronics, since such modified films demonstrate birefringence, dichroism [ 15 , 16 ], and anisotropy of electrical properties [ 12 , 15 , 17 ]. In general, for a wider set of materials one of the promising LIPSS applications is polarization-sensitive optical memory fabrication [ 16 ] including multilevel and highly stable coding [ 18 ]. In such a system, three bits of information or more can be written [ 19 ] in a single micron-scaled cell with the LIPSS formed within it.…”

Section: Introductionmentioning

confidence: 99%

Fabricating Femtosecond Laser-Induced Periodic Surface Structures with Electrophysical Anisotropy on Amorphous Silicon

et al. 2020

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One-dimensional periodic surface structures were formed by femtosecond laser irradiation of amorphous hydrogenated silicon (a-Si:H) films. The a-Si:H laser processing conditions influence on the periodic relief formation as well as correlation of irradiated surfaces structural properties with their electrophysical properties were investigated. The surface structures with the period of 0.88 and 1.12 μm were fabricated at the laser wavelength of 1.25 μm and laser pulse number of 30 and 750, respectively. The orientation of the surface structure is defined by the laser polarization and depends on the concentration of nonequilibrium carriers excited by the femtosecond laser pulses in the near-surface region of the film, which affects a mode of the excited surface electromagnetic wave which is responsible for the periodic relief formation. Femtosecond laser irradiation increases the a-Si:H films conductivity by 3 to 4 orders of magnitude, up to 1.2 × 10−5 S∙cm, due to formation of Si nanocrystalline phase with the volume fraction from 17 to 28%. Dark conductivity and photoconductivity anisotropy, observed in the irradiated a-Si:H films is explained by a depolarizing effect inside periodic microscale relief, nonuniform crystalline Si phase distribution, as well as different carrier mobility and lifetime in plane of the studied samples along and perpendicular to the laser-induced periodic surface structures orientation, that was confirmed by the measured photoconductivity and absorption coefficient spectra.

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Multilevel data writing in nanoporous glass by a few femtosecond laser pulses

Cited by 23 publications

References 26 publications

Glass: Home of the Periodic Table

Glass: Home of the Periodic Table

Periodic Relief Fabrication and Reversible Phase Transitions in Amorphous Ge2Sb2Te5 Thin Films upon Multi-Pulse Femtosecond Irradiation

Fabricating Femtosecond Laser-Induced Periodic Surface Structures with Electrophysical Anisotropy on Amorphous Silicon

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