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Identifier 000389998
Title Electromagnetic wave propagation in gradient index metamaterials, plasmonic systems and optical fiber networks
Alternative Title Διάδοση ηλεκτρομαγνητικών κυμάτων σε μετα-υλικά μεταβαλλόμενου δείκτη διάθλασης, πλασμονικά συστήματα και δίκτυα οπτικών ινών
Author Ματθαιάκης, Μάριος Μ.
Thesis advisor Τσιρώνης, Γεώργιος
Reviewer Τζωρτζάκης, Στέλιος
Καφεσάκη, Μαρία
Ζώτος, Ξενοφών
Περάκης, Ηλίας
Κομίνης, Ιωάννης
Ηλιόπουλος, Ελευθέριος
Abstract Metamaterials constitute a relatively new field which is very promising because it exhibits properties that may not be readily found in nature. One of promising lines of research is the study of novel characteristics of the propagation of electromagnetic (EM) waves in gradient refractive index (GRIN) lenses. In this Thesis, three geometrical optics methods as well as a wave numerical method have been developed for the investigation of EM waves propagation through media with certain refractive indices. Furthermore, we study the propagation of EM waves through specific geometrical configurations as well as through complex random networks of GRIN lenses, such as Luneburg (LL) and Luneburg Hole (LH) lenses. We show that waveguides, which are formed by LLs, offer the capability of better controlling the propagation characteristics of EM waves. In addition, we show that branched flows and extreme events can arise in such complex photonic systems. In addition to GRIN lenses networks, we use the discrete nonlinear Schrodinger equation to investigate the propagation of an EM wavepacket through certain configurations of optical fiber lattices and investigate the effects of randomness and nonlinearity in the diffusion exponent. Finally, we study surface plasmon polaritons (SPPs). We investigate how the presence of active (gain) dielectrics changes the dispersion relation and enhance the propagation length of SPPs. We show that the use of an active dielectric with gain, which compensates for metal absorption losses, enhances substantially the plasmon propagation.
Language English
Subject Active dielectrics
Branched flow
Complex networks
Extreme events
Surface plasmon polaritons
Waveguides
Ακραία φαινόμενα
Διακλαδισμένη διάδοση
Ενεργά διηλεκτρικά
Επιφανειακά πλασμόνια
Κυματοδηγοί
Οπτικές ίνες
Πολύπλοκα δίκτυα
Issue date 2014-12-22
Collection   School/Department--School of Sciences and Engineering--Department of Physics--Doctoral theses
  Type of Work--Doctoral theses
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