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Author: | Grahn, Patrick |
Title: | Multipole excitations in optical meta-atoms |
Multipolexcitationer i optiska metaatomer | |
Publication type: | Master's thesis |
Publication year: | 2012 |
Pages: | [7] + 57 Language: eng |
Department/School: | Teknillisen fysiikan laitos |
Main subject: | Optiikka ja molekyylimateriaalit (Tfy-125) |
Supervisor: | Kaivola, Matti |
Instructor: | Shevchenko, Andriy |
Electronic version URL: | http://urn.fi/URN:NBN:fi:aalto-201209213142 |
OEVS: | Electronic archive copy is available via Aalto Thesis Database.
Instructions Reading digital theses in the closed network of the Aalto University Harald Herlin Learning CentreIn the closed network of Learning Centre you can read digital and digitized theses not available in the open network. The Learning Centre contact details and opening hours: https://learningcentre.aalto.fi/en/harald-herlin-learning-centre/ You can read theses on the Learning Centre customer computers, which are available on all floors.
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Location: | P1 Ark Aalto 747 | Archive |
Keywords: | metamaterials multipole expansion electric quadrupole metamaterial multipolutveckling elektrisk kvadrupol |
Abstract (eng): | Recent developments in nano-optics and nanofabrication technology have made it possible to construct artificial atoms, called meta-atoms, and out of them compose materials with extraordinary optical properties. These materials are called optical meta-materials. Conventionally, meta-atoms are made of noble metals and have their shapes designed to promote certain types of optically excited electric currents. In this thesis, we develop a multi-pole theory that enables us to exactly identify the excitation character in an arbitrary meta-atom. We propose a new meta-atom design, the disc meta-dimer, and use our multi-pole theory to analyze its properties. In contrast to natural atoms, incident light can interact with this meta-atom without exciting any electric dipole moment. Instead, the light excites pronounced magnetic dipole and electric quadrupole moments. We anticipate that a new type of meta-material, the quadrupole meta-material, can be constructed of these meta-atoms. |
Abstract (swe): | Den senaste utvecklingen inom nanooptik och nanotillverkning har möjliggjort framställning av artificiella atomer som kallas metaatomer. Utav dem kan man framställa material med enastående optiska egenskaper. Dessa material kallas för optiska metamaterial. Metaatomer är vanligtvis framställda av ädelmetaller och är formade så att de främjar specifika optiskt exciterade elektriska strömmar. I denna avhandling utvecklar vi en multipolteori med vilken vi kan exakt identifiera excitationstypen i en godtycklig metaatom. Vi presenterar skivmetadimern, en ny metaatomdesign vars egenskaper vi analyserar med vår multipolteori. I motsats till naturliga atomer så kan inkommande ljus växelverka med denna metaatom utan att excitera elektriska dipolmoment. Istället exciterar ljuset avsevärda magnetiska dipolmoment och elektriska kvadrupolmoment. Vi förutser att dessa metaatomer kan användas för att framställa en ny typ av metamaterial som vi benämner kvadrupolmetamaterial. |
ED: | 2012-05-14 |
INSSI record number: 44519
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