Silicon nanophotonic modulators with field-effect control of free carriers: the epsilon-near-zero effect in transparent conducting oxides

Abstract

This thesis lies in the broader area of nanophotonics and photonic integrated circuits. The subject focuses on the design of electro-optical modulators based on free-carrier effects in transparent conducting oxides (TCOs), exploiting the epsilon-near-zero effect (ENZ) they manifest in the near-infrared region. The design is carried out on mature silicon-photonic waveguides, coated with a thin film of transparent conducting oxide (ITO), interposing a high dielectric constant oxide (HfO2). The modulation is achieved by controlling the concentration of free carriers in the transparent conducting oxide under the effect of an external electric field. The field effect is described through the drift-diffusion model, which is derived from semiconductor theory under realistic assumptions. The model is able to rigorously and consistently describe highly heterogeneous junctions, both in steady-state and transient conditions. Changes at the microscopic level are mapped to macroscopic material quan ...
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DOI
10.12681/eadd/51394
Handle URL
http://hdl.handle.net/10442/hedi/51394
ND
51394
Alternative title
Νανοφωτονικοί διαμορφωτές τεχνολογίας πυριτίου με έλεγχο φορέων υπό την επίδραση πεδίου: το φαινόμενο της σχεδόν μηδενικής διηλεκτρικής σταθεράς σε αγώγιμα διαφανή οξείδια
Author
Sinatkas, Georgios of Ioannis
Date
2022
Degree Grantor
Aristotle University Of Thessaloniki (AUTH)
Committee members
Κριεζής Εμμανουήλ
Γιούλτσης Τραϊανός
Ρέκανος Ιωάννης
Ζωηρός Κυριάκος
Κανταρτζής Νικόλαος
Γκανούλης Νικόλαος
Χριστόφιλος Δημήτριος
Discipline
Engineering and TechnologyElectrical Engineering, Electronic Engineering, Information Engineering ➨ Communication engineering and systems, Telecommunications
Engineering and TechnologyNano-Technology ➨ Nanoscience and Nanotechnology
Keywords
Optical modulators; Free-carrier effects; Transparent conducting oxides; Epsilon-near-zero effect
Country
Greece
Language
Greek
Description
tbls., fig.
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