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Enhanced electromagnetic field transfer across semiconductor-and-metal-nanoparticle oligomeric planar structure through exciton-plasmoninteractions
KTH, School of Biotechnology (BIO), Theoretical Chemistry and Biology.
KTH, School of Biotechnology (BIO), Theoretical Chemistry and Biology.ORCID iD: 0000-0002-2442-1809
(English)Manuscript (preprint) (Other academic)
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-93437OAI: diva2:515996
QS 2012Available from: 2012-04-17 Created: 2012-04-17 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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