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Singlet-triplet transition rate enhancement inside hyperbolic metamaterials

Research output: Contribution to journalArticle

Original languageEnglish
Article number1900101
JournalLaser and Photonics Reviews
Volume13
Issue number9
Early online date12 Aug 2019
DOIs
Accepted/In press5 Jul 2019
E-pub ahead of print12 Aug 2019
Published1 Sep 2019

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Abstract

The spontaneous emission process is known to be largely affected by the surrounding electromagnetic environment of emitters, which manifests itself via the Purcell enhancement of decay rates. This phenomenon has been extensively investigated in the case of dipolar transitions in quantum systems, commonly delivering fast decay rates in comparison to forbidden transitions such as high-order multipolar transitions or spin-forbidden, singlet-triplet phosphorescence processes. Here, we demonstrate a decay rate enhancement of almost 2800-fold considering a Ruthenium-based phosphorescent emitter located inside a plasmonic hyperbolic metamaterial. The standard electromagnetic local density of states description, typically employed for the Purcell factor analysis of dipolar transitions, is unable to account for a photoluminescence enhancement of this magnitude, which is attributed to the interplay between the local density of states and strongly inhomogeneous electromagnetic fields inside the metamaterial. The large available range of spontaneous emission lifetimes reported here enables application of phosphorescent emitters in novel fast and efficient light-emitting sources, beneficial for optical communications, quantum information processing, spectroscopy or bio-imaging.

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