Luminescence of a transition metal complex inside a metamaterial nanocavity

Connell, T, Earl, S, Ng, C, Roberts, A, Davis, T, White, J, Polyzos, A and Gomez, D 2017, 'Luminescence of a transition metal complex inside a metamaterial nanocavity', Small, vol. 13, no. 32, pp. 1-9.

Document type: Journal Article
Collection: Journal Articles

Title Luminescence of a transition metal complex inside a metamaterial nanocavity
Author(s) Connell, T
Earl, S
Ng, C
Roberts, A
Davis, T
White, J
Polyzos, A
Gomez, D
Year 2017
Journal name Small
Volume number 13
Issue number 32
Start page 1
End page 9
Total pages 9
Publisher Wiley-VCH Verlag
Abstract Modification of the local density of optical states using metallic nanostructures leads to enhancement in the number of emitted quanta and photocatalytic turnover of luminescent materials. In this work, the fabrication of a metamaterial is presented that consists of a nanowire separated from a metallic mirror by a polymer thin film doped with a luminescent organometallic iridium(III) complex. The large spin-orbit coupling of the heavy metal atom results in an excited state with significant magnetic-dipole character. The nanostructured architecture supports two distinct optical modes and their assignment achieved with the assistance of numerical simulations. The simulations show that one mode is characterized by strong confinement of the electric field and the other by strong confinement of the magnetic field. These modes elicit drastic changes in the emitter's photophysical properties, including dominant nanocavity-derived modes observable in the emission spectra along with significant increases in emission intensity and the total decay rate. A combination of simulations and momentum-resolved spectroscopy helps explain the mechanism of the different interactions of each optical mode supported by the metamaterial with the excited state of the emitter.
Subject Nanotechnology not elsewhere classified
Keyword(s) metamaterial
organometallic complexes
photoluminescent enhancement
Purcell effect
DOI - identifier 10.1002/smll.201700692
Copyright notice © 2017 Wiley-VCH Verlag
ISSN 1613-6810
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