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Modeling of partially spatially coherent distributed sources: derivation of an extended reciprocity theorem, creation of a numerical tool and experimental validation.

Projektbeschreibung

Ein neuer Simulator für dekohärente Lichtquellen fördert bessere Konstruktionen

Die Kohärenz ist in verschiedenen Bereichen – von der Sozialwissenschaft und Kognitionsforschung bis hin zu Technik und Physik – positiv besetzt. Obwohl hochkohärente Lichtquellen, bei denen die meisten Photonen die gleiche Frequenz haben, für die Fern-, Hochgeschwindigkeits- und Weitfeldbildgebung erwünscht sind, können sie in der konventionellen Mikroskopie Reflexionen von fast allem erzeugen, was ihnen in die Quere kommt, darunter auch Staub und Oberflächenfehler. Durch die Modulation der räumlichen Kohärenz einer optischen Quelle kann räumlich teilkohärentes Licht sehr nützlich werden. Dies hat bisher jedoch nur wenig Beachtung gefunden. Das EU-finanzierte Projekt Coh2Shape schafft hier mit Modellierungswerkzeugen und experimenteller Validierung Abhilfe, um die Entwicklung neuartiger Emitter für zahlreiche Anwendungen in Bereichen wie der Materialwissenschaft, Technik und Medizin zu unterstützen.

Ziel

Going up to infrared or optical frequencies, classical antenna technology fails due to the lack of efficient localized feeds. At such frequencies, emitters generally rely on distributed feeds. Each point of the extended source zone emits fields randomly, so that the total fields generated by the device are only partially spatially coherent. The partially spatially coherent aspect of the fields has received limited attention so far, especially in the engineering community. However, it is well known that the spatial coherence of the fields plays a key role in shaping and enhancing the radiation from thermal and electroluminescent sources.
In this project, we propose a framework where the fields emitted by such sources are decomposed into an incoherent sum of fully coherent modes. During this project, we will develop a versatile open-source software that can simulate such devices using a full-wave integral equation method. This software can be used to study thermal or electroluminescent emitters of various geometries while rigorously accounting for the partial coherence of the fields. The software will be validated through experiments and shared with the community. Using the modal framework, an extended reciprocity theorem between the fields emitted by thermal or electroluminescent sources and the fields they absorb that includes the partially coherent aspect will be derived and validated through experiments.
This project is expected to deeply impact the field since no such tool that can rigorously account for the partial coherence of the fields has been proposed so far. Moreover, the experimental characterization of emitters will be easier using the extended reciprocity.
This project will be done in the University of Cambridge in collaboration with J.-J. Greffet (France) and C. Craeye (Belgium). Through this project, the researcher will develop skills in experimental research, which he is currently missing to reach an independent position.

Koordinator

THE CHANCELLOR MASTERS AND SCHOLARS OF THE UNIVERSITY OF CAMBRIDGE
Netto-EU-Beitrag
€ 224 933,76
Adresse
TRINITY LANE THE OLD SCHOOLS
CB2 1TN Cambridge
Vereinigtes Königreich

Auf der Karte ansehen

Region
East of England East Anglia Cambridgeshire CC
Aktivitätstyp
Higher or Secondary Education Establishments
Links
Gesamtkosten
€ 224 933,76