Abstract
Electronic interactions at the nanoscale represent one of the fundamental problems of nanotechnology. Excitons and plasmons are the two most typical excited states of nanostructures, which have been shown to produce coupled electronic systems1,2,3,4,5,6,7,8,9,10,11. Here, we explore these interactions for the case of nanowires with mobile excitons and nanoparticles with localized plasmons and describe the theoretical formalism, its experimental validation and the potential practical applications of such nanoscale systems. Theory predicts that emission of coupled excitations in nanowires with variable electronic confinement is stronger, shorter and blue-shifted. These predictions were confirmed with a high degree of accuracy in molecular spring assemblies of CdTe nanowires and Au nanoparticles, where we can reversibly change the distance between the exciton and the plasmon. The prepared systems were made protein-sensitive by incorporating antibodies in the molecular springs. Modulation of exciton–plasmon interactions can serve as a wavelength-based biodetection tool, which can resolve difficulties in the quantification of luminescence intensity for complex media and optical pathways.
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Acknowledgements
The authors thank J. H. Bahng, Biomedical Engineering Department, University of Michigan, for useful discussion and assistance in biological experiments. The project was supported by NSF (N.A.K. and A.O.G.), DARPA, AFOSR, NIH (N.A.K.) and Ohio University (A.O.G.).
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N.A.K. and J.L. carried out the experimental work and bio-assembly, whereas A.O.G. and P.H. carried out the theoretical study and modelling.
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Lee, J., Hernandez, P., Lee, J. et al. Exciton–plasmon interactions in molecular spring assemblies of nanowires and wavelength-based protein detection. Nature Mater 6, 291–295 (2007). https://doi.org/10.1038/nmat1869
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DOI: https://doi.org/10.1038/nmat1869
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