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Identifier

000454249

Title

Fabrication of 3D low THz metamaterials via 2-photon polymerization

Alternative Title

Κατασκευή 3Δ χαμηλών THz μεταϋλικών μέσω διφωτονικού πολυμερισμού

Author

Παπαμακάριος, Σάββας Σ.

Thesis advisor

Φαρσάρη, Μαρία

Reviewer

Καφεσάκη, Μαρία
Μακρής, Κωνσταντίνος

Abstract

Metamaterials are artificial designed materials that can enhance nature’s characteristics and provide extraordinary properties in varying fields. One of the most important categories of metamaterials are the electromagnetic, where specific architecture of the meta-atom can manipulate the electromagnetic field in scaling frequencies and wavelengths. In the present thesis the study is focused on low THz (0.1-10 THz) regime, which is an important frequency band since there are no known nature’s materials that can interact with electromagnetic waves in these wavelengths scale, known as the THz gap. For this reason, it is of high interest to find ways to manipulate light at these frequencies, to evolve and expand THz technology in sensing and telecommunication applications. In order to achieve the manipulation of low THz frequencies, the meta- atoms have to be optimized to enhance the electromagnetic response in this regime. Thus, it is crucial for the study and development of metamaterials to use simulations. For the simulations, Finite Different Time Domain (FDTD) method was used that has been shown to be one of the most accurate computational methods for electromagnetic research. For the fabrication of the metamaterials, 2-photon polymerization (2PP) was used to provide the high resolution that this frequency regime requires and the capability of fab- ricating dielectric and metallo-dielectric structures. Theoretical models of classical cross-shaped Split Ring Resonators (SRRs) were developed to ex- plain the effects of broken symmetries in electromagnetic metamaterials and introduce the main study which is the fabrication and characterization of a state-of-the-art asymmetric pillar SRR that provides Electromagnetically Induced Transparency (EIT) in the frequency band of 2 THz. The whole complex and challenging process, from the synthesis of the photosensitive material until the final characterization of the sample is highlighted through the present thesis. In addition, the final part of the thesis is focused on some of the applica- tions that metamaterials and 2PP combined can provide, making the transition from virtual environment of simulations to reality in a straightforward way, for varying frequency bands.

Language

English

Subject

Electromagnetism

Metallization

Nanostructures

Simulations

Διφωτονικός

Επιμετάλλωση

Ηλεκτρομαγνητισμός

Μεταϋλικά

Νανοδομές