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Identifier

000466966

Title

Angularly accelerating optical beams

Alternative Title

Γωνιακά επιταχυνόμενες οπτικές δέσμες

Author

Μπρίμης, Απόστολος Ι

Thesis advisor

Μακρής, Κωνσταντίνος

Reviewer

Παπάζογλου, Δηµήτρης
Ρακιτζής, Θεόδωρος-Πέτρος
Αποστολόπουλος, Βασίλειος
Wolf von Klitzing
Τζωρτζάκης, Στέλιος
Καφεσάκη, Μαρία

Abstract

Structured light has recently emerged as a topic of wide interest in optics. In its more general description Structured Light refers to the controlled modulation of an optical light beam in order to engineer its properties along propagation. By modulating the phase, the amplitude, and the polarization of a light we can control the intensity, phase and polarization distribution along propagation. This thesis is focused on the theoretical study of light beams that twist as they propagate. By introducing novel design approaches we have introduced a new family of structured light, referred to as Tornado Waves (ToWs), that abruptly autofocus while twisting in an accelerating fashion. Using numerical simulations, we have demonstrated that light structures with features that twist and shrink with trajectories resembling the shape of a Tornado can be generated by beams that carry orbital angular momentum (OAM). Our findings show that Tornado waves can exhibit angular acceleration, a measure of how the pitch of the spiraling structure varies along propagation, that is orders of magnitude higher compared to the bibliography. Likewise, we have revealed the interplay between phase singularities and intensity features that synchronously twist in Tornado waves. Finally, we have extended our study to structured polarized light and more specifically to Poincaré beams that exhibit interwinding polarization singularities and chiral polarized domains. Our results offer new directions of research in areas related to the spiraling behavior of light such as optical tweezers, singular optics, direct laser writing, non-linear wave mixing, harmonic generation, wavefront shaping, and polarization engineering.

Language

English

Subject

OAM of light

Polarization of light

Structured light

Δομημένο φως

Επιταχυνόμενα οπτικές δέσμες

Πόλωση του φωτός

Στροφορμή του φωτός

Issue date

2024-09-09