E-Locus - Institutional Repository of the University of Crete

Home Search

Results - Details

Search command : Author="Παπάζογλου" And Author="Δημήτρης"

Current Record: 4 of 23

[Add to Basket]

Identifier

000451679

Title

Propagation of tornado waves in turbulent media

Alternative Title

Διάδοση οπτικών στροβίλων σε μέσα με τυρβώδη ροή

Author

Μιχαηλίδης, Παναγιώτης Γιωρ.

Thesis advisor

Παπάζογλου, Δημήτρης

Reviewer

Μακρής, Κωνσταντίνος
Καφεσάκη, Μαρία

Abstract

The generation of custom light fields, based on wavefront shaping techniques often described as structured light, is a topic of wide interest in optics. Βy imprinting a helical phase, shaping can induce a topological charge to the wave. Such waves carry orbital angular momentum (OAM) and exhibit a rotating phase structure as they propagate. Twisting structured light, where the intensity pattern rotates forming a helical pattern, can be generated by superimposing structured light that caries OAM of opposite helicity. Recently a new type of structured light, referred to as Tornado waves (ToWs), that combines radial with angular acceleration was introduced [1,2]. Like a tornado, ToWs intensity maxima outline a spiral of decreasing radius and pitch as they propagate. The combination of angular acceleration with intense abrupt autofocusing, and the ability to tailor the confined focal volume makes these novel waves ideal for applications. On the other hand, propagation of optical waves in turbulent media is affected by mainly by turbulence, but also scattering and absorption. In this thesis we theoretically study, using numerical simulations the effect of turbulence on the propagation of ToWs. Our study focuses on schemes that refer to optical telecommunication links and the use realistic atmosphere models as a reference medium. The link quality as well as the effectiveness of each model, is characterized by estimating the scintillation index, the intensity-weighted average as well as other statistical properties of the beam that reaches the receiver.

Language

English

Subject

Atmospheric turbulence

Optical propagation

Optical vortices

Ατμόσφαιρα

Οπτική διάδοση

Οπτικοί στρόβιλοι

Τυρβώδη μέσα

Issue date

2022-11-25