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Electromagnetic Phase Engineering With Metamaterials
KTH, School of Engineering Sciences (SCI), Applied Physics.
2021 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Elektromagnetisk Fasdesign med Metamaterial (Swedish)
Abstract [en]

Metamaterials are artificially designed materials with desired electromagneticresponses for advanced wave manipulation. Their key constituent is often somenoble metal, thanks to its well localized plasmonic effects with highextinction cross section. In this project, a metamaterial based onmetal-insulator-metal (MIM) structure is investigated to create a compactplanar reflector which mimics the function of a parabolic mirror. In such ametamaterial, each MIM unit is essentially a sub-wavelength resonator whichexhibits magnetic-dipole resonance. To achieve focusing effect, phase shift onreflected wave by each MIM unit upon a plane-wave incidence is calculatedrigorously through finite-element method. By carefully selecting unitgeometries and thereby introducing a phase gradient along the reflector plane,one can control propagation direction of reflected wave at each reflectorposition. The principle can be explained in terms of either ray-optics theoryor generalized Snell’s law. As a particular demonstration, we have designed inthe thesis a planar reflector consisting of eleven MIM units with a totaldevice width of 5.5 µm. FEM simulation showed that the reflector focuses lightat 1.2 µm wavelength with a nominal focus length of 6 µm. Such compactmetamaterial devices can be potentially fabricated on chips for sensing andtelecom applications, circumventing many inconveniences of includingconventional lenses in an optical system.

Abstract [sv]

Metamaterial är artificiellt konstruerade material med vissa önskadeelektromagnetiska egenskaper, vilket kan utnyttjas för avancerad styrning avelektromagetisk vågutbredning. Metamaterialet som undersöks i denna rapportär baserad på en metall-isolator-metall (MIM) struktur, denna strukturkommer användas för konstruktion av en platt parabolisk reflektor. Vilket isin tur består av en serie MIM-strukturer med varierande storlekar. VarjeMIM-struktur är i princip en resonator med en storleksordning mycket mindreän våglängden och ger upphov till en magnetisk resonans. För att sedan uppnåfokus genomförs en rigorös beräkning av fasen med hjälp av finita elementmetoden, varpå man kan beräkna fas och amplitud från strukturen efterreflektion från en plan våg. Därefter kan man välja ut de geometrierna somkrävs för att styra riktningen av vågpropagationen med en fasgradient.Fysikaliska principerna kan förklaras genom stråloptik eller med hjälp avgeneraliserade Snell's lag. I denna rapport presenteras en design av en planreflektor med elva MIM strukturer där den totala storleken är 5.5 µm. FEMsimulering visade att reflektorn fokuserade ljuset vid våglängden 1.2 µm medden nominella fokallängden 6 µm. Dessa kompakta metamaterial kan eventuellttillverkas på chip för detektering och telekom, vilket löser problemen medatt inkludera konventionella linser i optiska system.

Place, publisher, year, edition, pages
2021.
Series
TRITA-SCI-GRU ; 2021:301
Keywords [en]
Applied Physics, Electromagnetism, Metamaterials, MIM, Plasmonics, FEM, Reflector design, Phase engineering
Keywords [sv]
Tillämpad fysik, Elektromagnetism, Metamaterial, MIM, Plasmonics, FEM, Reflektor design, Fasdesign
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-303355OAI: oai:DiVA.org:kth-303355DiVA, id: diva2:1602688
Subject / course
Applied Physics
Educational program
Master of Science - Engineeering Physics
Supervisors
Examiners
Available from: 2021-10-13 Created: 2021-10-13 Last updated: 2022-06-25Bibliographically approved

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