Ms. Viktorija Padolskyte Profile

Viktorija Padolskyte

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Publications (3)

Proceedings Article | 18 October 2019 Presentation

Nanoscale 3D laser additive manufacturing of highly resilient glass ceramics (Conference Presentation)

Darius Gailevičius, Greta Merkininkaite, Viktorija Padolskyte, Simonas Varapnickas, Meguya Ryu, Junko Morikawa, Vygantas Mizeikis, Simas Sakirzanovas, Saulius Juodkazis, Mangirdas Malinauskas

Proceedings Volume 11168, 111680F (2019) https://doi.org/10.1117/12.2532804

KEYWORDS: Lithography, Ultrafast lasers, Additive manufacturing, Spatial resolution, Optical properties, Thermography, Optical sensors, Environmental sensing

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Proceedings Article | 22 May 2018 Paper

3D opto-structuring of ceramics at nanoscale

Viktorija Padolskytė, Darius Gailevičius, Linas Jonušauskas, Lina Mikoliūnaitė, Tomas Katkus, Roaldas Gadonas, Simas Šakirzanovas, Vygantas Mizeikis, Kestutis Staliunas, Saulius Juodkazis, Mangirdas Malinauskas

Proceedings Volume 10675, 106750U (2018) https://doi.org/10.1117/12.2306883

KEYWORDS: Ceramics, Crystals, Nanolithography, Raman spectroscopy, Plasma etching, 3D printing, Dry etching, Biomedical optics, Laser applications, Glasses

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Ceramics as advanced materials play an important role in science and technology as they are mechanically robust, can withstand immense heat, are chemically inert. Consequently, there is a direct end-user driven need to find ways for efficiently acquiring free-form 3D ceramic structures. Recently, stereo-lithographic 3D printing of hybrid organic-inorganic photo-polymer and subsequent heating was demonstrated to be capable of providing true 3D ceramic and glass structures. Up to now, this was limited to (sub-)millimeter scale and naturally the next step is to acquire functional glass-/ceramic-like 3D structures in micro-/nano-dimensions. In this paper, we explore a possibility to apply ultrafast 3D laser nanolithography followed by heating to acquire ceramic 3D structures down to micro-/nano-dimension. Laser fabrication is employed for the production of initial 3D structures with varying (ranging within hundreds of nm) feature sizes out of hybrid organic-inorganic material SZ2080. Then, a post-fabrication heating at different temperatures up to 1500 °C in an air atmosphere facilitates metal-organic framework decomposition, which results in the glass-ceramic hybrid material. Additionally, annealing procedure densifies the obtained objects providing an extra route for size control. As we show, this can be applied to bulk and free-form objects. We uncover that the geometric downscaling can reach up to 40%, while the aspect ratio of single features, as well as filling ratio of the whole object, remains the same regardless of volume/surface-area ratio. The structures proved to be qualitatively resistant to dry etching, hinting at significantly increased resiliency. Finally, Raman spectrum and X-ray diffraction (XRD) analysis were performed in order to uncover undergoing chemical processes during heat-treatment in order to determine the composition of material obtained. Revealed physical and chemical properties prove the proposed approach paving a route towards 3D opto-structuring of ceramics at the nanoscale for diverse photonic, microfluidic and biomedical applications.

Proceedings Article | 22 February 2018 Presentation + Paper

Fabrication of 3D glass-ceramic micro- /nano-structures by direct laser writing lithography and pyrolysis

Darius Gailevičius, Simas Sakirzanovas, Viktorija Padolskyte, Subhashri Chatterjee, Linas Jonusauskas, Roaldas Gadonas, Kestutis Staliunas, Vygantas Mizeikis, Saulius Juodkazis, Mangirdas Malinauskas

Proceedings Volume 10544, 1054416 (2018) https://doi.org/10.1117/12.2282048

KEYWORDS: Heat treatments, Nanolithography, Lithography, Scanning electron microscopy, Reflectivity, Crystals, Multiphoton lithography, Ceramics, Glasses, Photonic crystals

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Glass-ceramics play an important role in todays science and industry as it can withstand immense heat, mechanical and other hazards. Consequently, there is a need to find ever-new ways to acquire more sophisticated free-form 3D ceramic and glass structures. Recently, stereo-lithographic 3D printing of hybrid organic-inorganic photopolymer and subsequent pyrolysis was demonstrated to be capable of providing true 3D ceramic and glass structures. However, such approach was limited to (sub-)millimeter scale, while one of the aims in the field is to acquire functional 3D glass-like structures in micro- or even nano-dimensions. In this paper, we explore a possibility to apply ultrafast 3D laser nanolithography in conjunction with pyrolysis to acquire glass-ceramic 3D structures in micro- and nano-scale. Laser fabrication allows production of initial 3D structures with relatively small (hundreds of nm) feature sizes out of hybrid organic-inorganic material SZ2080. Then, a post-fabrication heating at different temperatures up to 1000°C in Ar , air or O₂ atmospheres decomposes organic part of the material leaving only the glass-ceramic component of the hybrid. As we show, this can be done to 3D woodpiles and bulk objects. We uncover that the shrinkage during sintering can reach up to 40%, while the aspect ratio of single features as well as filling ratio of the whole object remains the same. This hints at homogeneous reduction in size that can be easily accounted for and pre-compensated before manufacturing. Additionally, the structures prove to be relatively resilient to focused ion beam (FIB) milling, hinting at increased rigidity. Finally, thermal gravimetric analysis (TGA) and Fourier transform infrared micro-spectroscopy measurements are performed in order to uncover undergoing chemical and physical phenomena during pyrolysis and composition of the remnant material. The proposed post-processing approach offers a straightforward way to downscale true 3D micro-/nanostructures for applications in nanophotonics, microoptics and mechanic devices with improved performance while being highly resilient to harsh surrounding conditions.

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