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Finite-difference time-domain simulations of exciton-polariton resonances in quantum-dot arrays
KTH, School of Biotechnology (BIO), Theoretical Chemistry (closed 20110512).
KTH, School of Biotechnology (BIO), Theoretical Chemistry (closed 20110512).ORCID iD: 0000-0002-2442-1809
KTH, School of Electrical Engineering (EES), Signal Processing.ORCID iD: 0000-0002-3599-5584
National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Science.
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2008 (English)In: Optics Express, ISSN 1094-4087, Vol. 16, no 7, 4507-4519 p.Article in journal (Refereed) Published
Abstract [en]

The optical properties of nanosize quantum-dot (QD) arrays are found to vary significantly around the exciton resonance frequency of the QDs. In order to simulate the interactions between electromagnetic waves and QD arrays, a general auxiliary-differential-equation, finite-difference time-domain approach is introduced and utilized in this article. Using this numerical method, the exciton-polariton resonances of single-layer and double-layer GaAs QD arrays are studied. The optical properties of a single-layer QD array are found to be characterized by the Mie resonance of its constituent QDs, while a double-layer QD array is characterized by the quasi-dipole formed by two QDs positioned in each of the two layers.

Place, publisher, year, edition, pages
2008. Vol. 16, no 7, 4507-4519 p.
Keyword [en]
Excitons; Finite difference time domain method; Optical properties; Semiconductor quantum dots; Exciton-polariton resonances; Quantum-dot arrays; Resonance; article; computer simulation; finite element analysis; light; methodology; surface plasmon resonance; theoretical model; Computer Simulation; Finite Element Analysis; Light; Models, Theoretical; Quantum Dots; Surface Plasmon Resonance
National Category
Theoretical Chemistry
URN: urn:nbn:se:kth:diva-7500DOI: 10.1364/OE.16.004507ISI: 000255100400015ScopusID: 2-s2.0-41649112952OAI: diva2:12545

QC 20150727. Uppdaterad från Submitted till Published 20100825.

Available from: 2007-09-25 Created: 2007-09-25 Last updated: 2015-07-27Bibliographically approved
In thesis
1. Optical properties of active photonic materials
Open this publication in new window or tab >>Optical properties of active photonic materials
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Because of the generation of polaritons, which are quasiparticles possessing the characteristics of both photonics and electronics, active photonic materials offer a possible solution to transfer electromagnetic energy below the diffraction limit and further increase the density of photonic integrated circuits. A theoretical investigation of these exciting materials is, therefore, very important for practical applications.

Four different kinds of polaritons have been studied in this thesis, (1) surface polaritons of negative-index-material cylindric rods, (2) exciton polaritons of semiconductor quantum dots, (3) localized plasmon polaritons of metallic nanoshells, and (4) surface plasmon polaritons of subwavelength hole arrays in thin metal films. All these types of polaritons were found to strongly affect the optical properties of the studied active photonic materials. More specifically, (1) for two-dimensional photonic crystals composed of negative-index-material cylindric rods, the coupling among surface polaritons localized in the rods results in dispersionless anti-crossing bands; (2) for three-dimensional diamond-lattice quantum-dot photonic crystals, the exciton polariton resonances lead to the formation of complete band gaps in the dispersion relationships; (3) for metallic nanoshells, the thickness of the metal shell strongly modifies the localized plasmon polaritons, and therefore influences the degree of localization of the electromagnetic field inside the metallic nanoshells; (4) for subwavelength hole arrays in thin metal films, high-order surface-polariton Bloch waves contribute significantly to the efficient transmission.

To numerically simulate these active photonic materials, we introduced three approaches, (1) an extended plane-wave-based transfer-matrix approach for negative- index-material media, (2) a plane-wave method for semiconductor quantum-dot photonic crystals, and (3) an auxiliary-differential-equation finite-difference time- domain approach for semiconductor quantum-dot arrays. A brief perspective is also given at the end of this thesis.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. 78 p.
nanophotonics, plasmonics
National Category
Theoretical Chemistry
urn:nbn:se:kth:diva-4497 (URN)978-91-7178-763-7 (ISBN)
Public defence
2007-10-15, FA32, Main Building, AlbaNova, AlbaNova, 14:00
QC 20100825Available from: 2007-09-25 Created: 2007-09-25 Last updated: 2010-08-25Bibliographically approved

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