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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:
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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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