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Dynamic optical response of an excitonic quantum dot studied by solving the self-consistent Maxwell-Schrodinger equations nonperturbatively
KTH, School of Biotechnology (BIO), Theoretical Chemistry.
KTH, School of Biotechnology (BIO), Theoretical Chemistry.ORCID iD: 0000-0002-2442-1809
2010 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 82, no 24, 245305- p.Article in journal (Refereed) Published
Abstract [en]

The optical excitation of a quantum dot in real-world working conditions is studied by self-consistent solution of the time-dependent Schrodinger equation coupled to the Maxwell equations by the finite-difference time domain method, resulting in a polarization modification which is the basis for the enhanced light-matter interaction in many nanoscale devices. The commonly used perturbational analysis approach is compared to the results and found to be an acceptable approximation even for intense femtosecond pulse excitations where using the perturbative approach is risky. This allows device designers and simulators to confidently use the simpler and faster perturbative results in their work.

Place, publisher, year, edition, pages
2010. Vol. 82, no 24, 245305- p.
National Category
Condensed Matter Physics
URN: urn:nbn:se:kth:diva-30936DOI: 10.1103/PhysRevB.82.245305ISI: 000286895100004ScopusID: 2-s2.0-78651241334OAI: diva2:402763
QC 20110309Available from: 2011-03-09 Created: 2011-03-07 Last updated: 2012-04-17Bibliographically approved
In thesis
1. Exciton-plasmon interactions in metal-semiconductor nanostructures
Open this publication in new window or tab >>Exciton-plasmon interactions in metal-semiconductor nanostructures
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Semiconductor quantum dots and metal nanoparticles feature very strong light-matter interactions, which has led to their use in many photonic applications such as photodetectors, biosensors, components for telecommunications etc.Under illumination both structures exhibit collective electron-photon resonances, described in the frameworks of quasiparticles as exciton-polaritons for semiconductors and surface plasmon-polaritons for metals.To date these two approaches to controlling light interactions have usually been treated separately, with just a few simple attempts to consider exciton-plasmon interactions in a system consisting of both semiconductor and metal nanostructures.In this work, the exciton-polaritons and surface \\plasmon-polaritons are first considered separately, and then combined using the Finite Difference Time Domain numerical method coupled with a master equation for the exciton-polariton population dynamics.To better understand the properties of excitons and plasmons, each quasiparticle is used to investigate two open questions - the source of the Stokes shift between the absorption and luminescence peaks in quantum dots, and the source of the photocurrent increase in quantum dot infrared photodetectors coated by a thin metal film with holes. The combined numerical method is then used to study a system consisting of multiple metal nanoparticles close to a quantum dot, a system which has been predicted to exhibit quantum dot-induced transparency, but is demonstrated to just have a weak dip in the absorption.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. viii, 50 p.
Trita-BIO-Report, ISSN 1654-2312 ; 2012:4
plasmons, excitons, quantum dots, nanoparticles, FDTD, surface plasmon polaritons, QDIP, quantum dot infrared photodetector, polaritons
National Category
Nano Technology Theoretical Chemistry
urn:nbn:se:kth:diva-93306 (URN)978-91-7501-301-5 (ISBN)
Public defence
2012-04-26, B2, Brinellvägen 23, KTH, Stockholm, 14:00 (English)
Swedish e‐Science Research Center

QC 20120417

Available from: 2012-04-17 Created: 2012-04-13 Last updated: 2013-04-09Bibliographically approved

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