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Coupling of Elementary Electronic Excitations: Drawing Parallels Between Excitons and Plasmons

Coupling of Elementary Electronic Excitations: Drawing Parallels Between Excitons and Plasmons

Journal of Physical Chemistry Letters: -

Recent advances in understanding the theoretical and experimental properties of excitons and plasmons have led to several technological breakthroughs. Though emerging from different schools of research, the parallels they possess both in their isolated and assembled forms are indeed interesting. Employing the larger framework of the dipolar coupling model, these aspects are discussed based on the excitonic transitions in chromophores and plasmonic resonances in noble metal nanostructures. The emergence of novel optical properties in linear, parallel and helical assemblies of chromophores and nanostructures with varying separation distances, orientations and interaction strengths of interacting dipolar components is discussed. The increased dipolar strengths of plasmonic transitions over the excitonic transitions, arising due to the collective nature of the electronic excitations in nanostructures lead to the emergence of hot spots in plasmonically coupled assemblies. Correlations on the distance dependence of electric field with Raman signal enhancements paved way to the development of capillary tube-based plasmonic platforms for the detection of analytes. .

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Accession: 057134878

Download citation: RISBibTeXText

PMID: 29394070

DOI: 10.1021/acs.jpclett.7b01833

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