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| Identifier |
000419055 |
| Title |
Orbital angular momentum and accelerating optical wavepackets |
| Alternative Title |
Τροχιακή στροφορμή και επιταχυνόμενα οπτικά κυματοπακέτα |
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Author
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Μπρίμης, Απόστολος Ι.
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Thesis advisor
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Παπάζογλου, Δημήτριος
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Reviewer
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Ρακιτζής, Πέτρος
Καφεσάκη, Μαρία
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| Abstract |
Light beams can rotate as they travel and thus carry angular momentum. Besides rotating their polarization vector, and thus carrying spin, their phase structure can also rotate. In this case the wave carries orbital angular mo¬mentum (OAM), which can be many times greater than the spin. Likewise, optical waves that carry OAM have an optical vortex along their propaga¬tion axis and are able to transfer angular momentum. OAM can be easily imprinted to an optical wavepacket by properly modulating its spatial phase. The interference wavepackets that carry OAM can lead to exciting new prop¬erties like angular acceleration. In this case the light beam rotates in an accelerating fashion as it propagates.
On the other hand, a family of novel optical wavepackets that propagate in curved trajectories and resist diffraction or dispersion has been recently introduced. These so called accelerating wavepackets are able to self-heal and bypass obstacles, advantages that make them exciting for a broad range of applications ranging from materials processing to telecommunications. The unique properties of accelerating wavepackets are correlated to their non-trivial amplitude and phase distributions and emerge from interference phenomena. The imprinting of orbital angular momentum on accelerating wavepackets can lead to novel twisted optical wavepackets with combined properties.
In this thesis we study the effect of orbital angular momentum on the propagation of optical wavepackets. In our study we focus on the physical mechanism that leads to angular acceleration, and on the design of optical wavepackets that exhibit tailored angular acceleration. Using numerical sim¬ulations we show that angular acceleration can be observed as a result of the interference of a variety of optical wavepackets ranging from modified Bessel to accelerating ring-Airy. Our results can have an important impact on applications like optical trapping and particle micromanipulation.
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| Language |
English |
| Subject |
Angular accelerating light |
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Helical beams |
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OAM |
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Vortex beams |
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Γωνιακά επιταχυνόμενο φως |
| Issue date |
2018-11-23 |
| Collection
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School/Department--School of Sciences and Engineering--Department of Physics--Post-graduate theses
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Type of Work--Post-graduate theses
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| Views |
412 |
Orbital angular momentum and accelerating optical wavepackets
