Active Tuning of LSPR and SLR for Au Nanoring Metasurfaces and Hybrids via Flexible Plasmonics

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dc.contributor.advisor Finot, Eric (Prof.Dr)
dc.contributor.author Tao, Wei
dc.date.accessioned 2023-10-16T12:59:23Z
dc.date.available 2023-10-16T12:59:23Z
dc.date.issued 2023-10-16
dc.identifier.uri http://hdl.handle.net/10900/146399
dc.identifier.uri http://nbn-resolving.de/urn:nbn:de:bsz:21-dspace-1463998 de_DE
dc.identifier.uri http://dx.doi.org/10.15496/publikation-87740
dc.description.abstract Recent advances in nanofabrication have stimulated research efforts in the field of flexible plasmonics by integrating functional metasurfaces onto mechanically flexible substrates. In this thesis, we report on the fabrication of flexible metasurfaces composed of gold regular and elliptical nanoring arrays embedded in polydimethylsiloxane (PDMS), using state-of-the-art electron beam lithography and wet-etching transfer techniques. In-situ dark-field reflection spectra are monitored on the flexible systems by implementing a homemade micro-stretcher inside the spectroscope. The feasibility of pattern transfer and reliability of optical measurement are further confirmed by subsequent SEM characterizations on PDMS. The spectral behavior of thin-width nanoring square arrays exhibits a significant shift towards longer wavelengths due to in-situ shape changes under strain. The shape-altering ability is carefully demonstrated through optical/SEM measurements and numerical simulations, which is further understood by a purposed squeezing mechanism. On the other hand, the spectral evolution of elliptical nanorings in square and triangular arrays presents interesting polarization dependence and spectral blueshift under strain. The square array subjected to high strain values exhibits also surface lattice resonances with Fano features due to the coupling between the grating and plasmonic modes. Additionally, we demonstrate Fano resonances in ring-disc-pair hybrid systems on a rigid substrate. The ring-disc-pair system shows significantly enhanced Fano features and surface-enhanced Raman signals with a decreasing gap, predicting well an active spectral tuning once they are transferred onto flexible substrates in future work. In general, this thesis expands the possibilities of conventional gap-altering flexible plasmonics by investigating plasmonic spectral shifts corresponding to NPs shape-altering, surface lattice resonances, and Fano coupling under strain. It provides valuable insights into strain sensing, flexible color displays, and wearable electronics with high sensitivity and selectivity. en
dc.language.iso de de_DE
dc.language.iso en de_DE
dc.language.iso fr de_DE
dc.publisher Universität Tübingen de_DE
dc.rights ubt-podok de_DE
dc.rights.uri http://tobias-lib.uni-tuebingen.de/doku/lic_mit_pod.php?la=de de_DE
dc.rights.uri http://tobias-lib.uni-tuebingen.de/doku/lic_mit_pod.php?la=en en
dc.subject.ddc 500 de_DE
dc.subject.other Plasmons (physics) en
dc.subject.other gold nanoparticles en
dc.subject.other Goldnanopartikel de_DE
dc.subject.other polydimethylsiloxane en
dc.subject.other Polydimethylsiloxan de_DE
dc.subject.other Lithografie de_DE
dc.subject.other lithography en
dc.subject.other Elektronenstrahl de_DE
dc.subject.other electron beam en
dc.subject.other optische Eigenschaften de_DE
dc.subject.other optical properties en
dc.subject.other Plasmonen de_DE
dc.title Active Tuning of LSPR and SLR for Au Nanoring Metasurfaces and Hybrids via Flexible Plasmonics en
dc.type PhDThesis de_DE
dcterms.dateAccepted 2023-09-21
utue.publikation.fachbereich Physik de_DE
utue.publikation.fakultaet 7 Mathematisch-Naturwissenschaftliche Fakultät de_DE
utue.publikation.source Nano Convergence, 10(1), 2023, 15; and Advanced Photonics Research, 2023, 2300012 de_DE
utue.publikation.noppn yes de_DE

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