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https://hdl.handle.net/123456789/706| Τύπος: | Διδακτορική διατριβή |
| Τίτλος: | Tailored Laser Wave Packets for Advanced Micro-Structuring of Materials |
| Συγγραφέας: | [EL] Μανουσιδάκη, Μαρία[EN] Manousidaki, Maria |
| Επιβλέπων διατριβής: | [EL] Τζωρτζάκης, Στυλιανός[EN] Tzortzakis, Stelios |
| Συμβουλευτική επιτροπή: | [EL] Παπάζογλου, Δημήτριος[EN] Papazoglou, Dimitris [EL] Φαρσάρη, Μαρία[EN] Farsari, Maria |
| Μέλος εξεταστικής επιτροπής: | [EL] Καφεσάκη, Μαρία[EN] Kafesaki, Maria [EL] Μακρής, Κωνσταντίνος[EN] Makris, Konstantinos [EL] Κιοσέογλου, Γεώργιος[EN] Kioseoglou, George [EL] Κοπιδάκης, Γεώργιος[EN] Kopidakis, George |
| Ημερομηνία: | Οκτ-2019 |
| Περίληψη: | The main aspects of this PhD thesis are the study, experimental realization and application of a variety of new laser beam shapes of remarkable and tunable optical characteristics, which dynamically can be employed for tailored Micro-Structuring of photosensitive materials using the Direct Laser Writing (DLW) technology by Multi-Photon Polymerization (MPP). Although the technique of DLW by MPP has been regarded as a powerful method for many applications providing high resolution structures, at the same time sets serious scaling limitations to the overall size of the fabricated structures leading to time consuming structuring. The last years the technological advances increase the demands for rapid fabrication, massive production, parallel processing, long scale structuring and high aspect ratio structures. For these reasons, in the content of the present PhD thesis, novel fabrication techniques including Shaped Laser beams, Holographic lithography and Focal beam Engineering for advanced, multiscale and tunable laser material’s processing, are being developed, proposed and demonstrated. The thesis starts with the study of the novel non-diffractive ring-Airy beams which due their exotic property to autofocus with an abrupt fashion, deliver high intensity contrast at the focal point. Tunable-ring Airy beams are experimentally generated and employed for the fabrication of large three-dimensional structures with high resolution using multi-photon polymerization. We demonstrate that these beams can be adjusted to abruptly autofocus over an extended range of working distances while keeping their voxel shape and dimensions almost invariant. Next, under optical scale down, we demonstrate that the paraxial ring-Airy beams can approach the wavelength limit, while observing a counterintuitive, strong enhancement of their focal peak intensity. Using numerical simulations, we show that this behavior is a result of the coherent constructive action of paraxial and nonparaxial energy flow. A simple theoretical model enables us to predict the parameter range over which this is possible. An important aspect on laser material processing applications is the thorough consideration of the focal volume scaling laws which are unveiled during fabrication, especially for high aspect ratio focal volumes. For this reason, we report on the action of exposure time and peak Intensity on the growth of long-range focal volumes in Multiphoton Polymerization. At the last part of this thesis, a new versatile three-dimensional (3D) holographic focal volume engineering method is demonstrated and employed for advanced Multiphoton Polymerization, while the method found to provide 20-times faster fabrication time in comparison to the point-by-point conventional laser polymerization technique. |
| Γλώσσα: | Αγγλικά |
| Τόπος δημοσίευσης: | Ηράκλειο Κρήτης, Ελλάδα |
| Σελίδες: | 127 |
| Θεματική κατηγορία: | [EL] Οπτική[EN] Optics |
| Λέξεις-κλειδιά: | Ολογραφία; Μη γραμμική οπτική; Spatial light modulator; additive manufacturing |
| Κάτοχος πνευματικών δικαιωμάτων: | © Μανουσιδάκη Μαρία |
| Διατίθεται ανοιχτά στην τοποθεσία: | https://www.didaktorika.gr/eadd/handle/10442/46441 |
| Σημειώσεις: | This work was supported by the State Scholarship Foundation (IKY) within the framework of the action “Doctoral Research Support (5003404), ESPA 2014-2020”, co-funded by the European Social Fund and the Hellenic State, Program 2017-050-0504-10113. |
| Εμφανίζεται στις συλλογές: | Υποψήφιοι διδάκτορες |
Αρχεία σε αυτό το τεκμήριο:
| Αρχείο | Περιγραφή | Σελίδες | Μέγεθος | Μορφότυπος | Έκδοση | Άδεια | |
|---|---|---|---|---|---|---|---|
| PhD Thesis_MANOUSIDAKI.pdf Until 2028-01-01 | 6.84 MB | Adobe PDF | Δημοσιευμένη/του Εκδότη |  | Δείτε/ανοίξτε |