Fabrication and characterisation of dielectric nanoparticle arrays - Tuning the light-matter interaction

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Journal Title
Journal ISSN
Volume Title
Perustieteiden korkeakoulu | Master's thesis
Date
2018-12-04
Department
Major/Subject
Engineering Physics
Mcode
SCI3056
Degree programme
Master’s Programme in Engineering Physics
Language
en
Pages
68
Series
Abstract
Nanoparticles ordered in periodic arrays provide electromagnetic resonances called surface lattice resonances (SLRs) leading to a high degree of local field confinement. If dye molecules are added on top of the nanoparticle arrays the system can be in the strong coupling regime. Typically, nanoparticle arrays consist of metals which, however, provide very high losses. In contrast, high-index dielectrics are low-dissipative and can therefore lead to narrower SLRs and therefore to longer lifetimes. In this work, we fabricate dielectric nanoparticle arrays made out of germanium and amorphous silicon. The SLRs of germanium and amorphous silicon nanoarrays are measured and compared to the SLRs of gold nanoarrays. A quality factor of up to 1.27 higher is provided by the SLRs of dielectric nanoarays compared to the SLRs of the gold nanoarrays. In addition, we measure the dispersion of the nanoarrays with fluorescent dye molecules on top and observe an indication of strong coupling.
Description
Supervisor
Törmä, Päivi
Thesis advisor
Väkeväinen, Aaro
Keywords
plasmonics, strong coupling, dielectric nanoparticles, surface lattice resonances, quantum optics
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