E-Locus - Institutional Repository of the University of Crete

Home Search

Results - Details

Search command : Author="Τζωρτζάκης" And Author="Στέλιος"

Current Record: 1 of 17

[Add to Basket]

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

Κυριακάκης, Απόστολος

Thesis advisor

τζωρτζάκης, Στέλιος

Reviewer

Φαρσάρη, Μαρία
Καφεσάκη, Μαρία

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.

Language

English

Subject

3D εκτύπωση

Ablation

Beam Shaping

Catalysis

Holography

Lithography

Metamaterials

Photopolymerization

Διαμόρφωση δέσμης