Please use this identifier to cite or link to this item: doi:10.22028/D291-29002
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Title: Increased fluorescence of PbS quantum dots in photonic crystals by excitation enhancement
Author(s): Barth, Carlo
Roder, Sebastian
Brodoceanu, Daniel
Kraus, Tobias
Hammerschmidt, Martin
Burger, Sven
Becker, Christiane
Language: English
Title: Applied physics letters
Volume: 111
Issue: 3
Startpage: 1
Endpage: 4
Publisher/Platform: AIP
Year of Publication: 2017
Publikation type: Journal Article
Abstract: We report on the enhanced fluorescence of lead sulfide quantum dots interacting with leaky modes of slab-type silicon photonic crystals. The photonic crystal slabs were fabricated, supporting leaky modes in the near infrared wavelength range. Lead sulfite quantum dots which are resonant in the same spectral range were prepared in a thin layer above the slab. We selectively excited the leaky modes by tuning the wavelength and angle of incidence of the laser source and measured distinct resonances of enhanced fluorescence. By an appropriate experiment design, we ruled out directional light extraction effects and determined the impact of enhanced excitation. Three-dimensional numerical simulations consistently explain the experimental findings by strong near-field enhancements in the vicinity of the photonic crystal surface. Our study provides a basis for systematic tailoring of photonic crystals used in biological applications such as biosensing and single molecule detection, as well as quantum dot solar cells and spectral conversion applications.
DOI of the first publication: 10.1063/1.4995229
URL of the first publication:
Link to this record: hdl:20.500.11880/27866
ISSN: 0003-6951
Date of registration: 24-Sep-2019
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Chemie
Professorship: NT - Prof. Dr. Tobias Kraus
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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