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Identifier |
000458409 |
Title |
Ultrashort laser wave packet sculpting for optimized materials engineering |
Alternative Title |
Διαμόρφωση υπερβραχέων κυματοπακέτων λέιζερ για βελτιστοποίηση της επεξεργασίας των υλικών |
Author
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Κυριακάκης, Απόστολος
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Thesis advisor
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τζωρτζάκης, Στέλιος
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Reviewer
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Φαρσάρη, Μαρία
Καφεσάκη, Μαρία
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Abstract |
Direct Laser Writing (DLW) is a well-established additive manufacturing technique that
offers great resolution and precision. In the quest though of high throughput processing, DLW
falls short due to the time-consuming point-by-point writing.
To address this issue, a Holographic Multi-Foci 3D Printing technique is studied in this thesis.
The time-optimized laser beam shaping is then used in two applications. The first application
is the fabrication of 3D periodic structures with high micro-featured porosity, coated with ZnO
Nanorods (NRs). Our time-efficient printing method enables the accelerated fabrication of
complex structures through parallel processing and offers the ability to scale up the structure
dimensions for practical applications, such as photocatalytic degradation of toxic substances.
In the frame of this MSc thesis, we also investigated the relation between the reaction rate and
the porosity of the structures by studying the photodegradation rate of organic pollutants over
time, under UV light irradiation, in samples with different porosity. In the second application
we explored the detection of harmful substances, such as pesticides, in extremely small
concentrations (ppb). We developed 2D meta-surfaces through the parallel processing (Multi-
Foci Parallel Ablation) on thin layers of gold. These materials have E/M response in the THz
frequency region, which is ideal for the detection of pollutants and other chemical residues.
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Language |
English |
Subject |
3D εκτύπωση |
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Ablation |
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Beam Shaping |
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Catalysis |
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Holography |
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Lithography |
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Metamaterials |
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Photopolymerization |
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Διαμόρφωση δέσμης |
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Διφωτονικός πολυμερισμός |
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Λιθογραφία |
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Φωτοπολυμερισμός |
Issue date |
2023-07-19 |
Collection
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School/Department--School of Sciences and Engineering--Department of Materials Science and Technology--Post-graduate theses
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Type of Work--Post-graduate theses
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Permanent Link |
https://elocus.lib.uoc.gr//dlib/b/5/f/metadata-dlib-1694151435-232133-23698.tkl
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Views |
629 |