Lingstädt, Robin (2023)
Plasmonic phenomena in multi-dimensional nanostructures characterized using advanced electron microscopy.
Technische Universität Darmstadt
doi: 10.26083/tuprints-00024566
Ph.D. Thesis, Primary publication, Publisher's Version
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Item Type: | Ph.D. Thesis | ||||
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Type of entry: | Primary publication | ||||
Title: | Plasmonic phenomena in multi-dimensional nanostructures characterized using advanced electron microscopy | ||||
Language: | English | ||||
Referees: | Molina-Luna, Prof. Dr. Leopoldo ; Aken, Prof. Dr. Peter A. van | ||||
Date: | 26 September 2023 | ||||
Place of Publication: | Darmstadt | ||||
Collation: | xvi, 151 Seiten | ||||
Date of oral examination: | 5 September 2023 | ||||
DOI: | 10.26083/tuprints-00024566 | ||||
Abstract: | Plasmonic phenomena have been used unknowingly of their scientific origin for more than thousand years for the production of colored glass by adding metallic salts during the melting process. Since investigations of electromagnetic properties at metal-dielectric interfaces over the last century have revealed that localized surface plasmon resonances on subwavelength-sized nanoparticles lead to optical absorption in the visible spectral range, the research field of “plasmonics” has evolved. As interconnect for light-matter interactions at the nanoscale, it has attracted significant attention due to its great potential for scientific and technological applications, such as guiding and focusing of light beyond the diffraction limit, realization of nanoantennas for optical probes in near-field imaging or surface-sensitive spectroscopic measurements. To achieve a fundamental understanding of macroscopic phenomena, it is essential to study the underlying mechanism for individual nanoscopic objects. This has become possible through the development of advanced fabrication methods such as atomic evaporation, ion beam milling and lithography procedures, as well as the availability of suitable characterization tools that provide the necessary spatial resolution and stability. In this dissertation, the plasmonic properties of two-dimensional, three-dimensional and true chiral nanostructures were explored, mainly by using advanced analytical electron microscopy techniques, including electron energy-loss measurements, cathodoluminescence spectroscopy and angle-resolved polarimetry. Numerical calculations were performed to confirm the experimental findings and enhance the comprehension of the underlying physics. Regarding the mentioned guiding capabilities, the propagation of plasmonic modes along clean and artificially structured edges of Bi2Se3 nanopatelets revealed the capability to cope with the presence of defects, which is highly beneficial for the realization of nanooptical circuits. Plasmonic gold tapers enable the nanoscale concentration of electromagnetic energy. Excitation mechanisms through fast electrons were reviewed and the “phase-matching” interaction experimentally confirmed via measurements for different kinetic energies of the incident electrons. Left- and right-handed gold nanohelices were fabricated and optically characterized to reveal their chiroptical response. Upon electron irradiation, longitudinal plamonic modes of multiple orders are excited along the helical windings. Their decay in combination with the chiral geometry leads to directional emission of circularly polarized light, that is strongly correlated both with the handedness of the investigated structure and the excitation position by the electron beam. |
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Status: | Publisher's Version | ||||
URN: | urn:nbn:de:tuda-tuprints-245666 | ||||
Classification DDC: | 500 Science and mathematics > 500 Science | ||||
Divisions: | 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences > Material Science > Advanced Electron Microscopy (aem) |
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Date Deposited: | 26 Sep 2023 12:07 | ||||
Last Modified: | 27 Sep 2023 08:21 | ||||
URI: | https://tuprints.ulb.tu-darmstadt.de/id/eprint/24566 | ||||
PPN: | 511910878 | ||||
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