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Issue 45, 2020
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Fine-tuning of polariton energies in a tailored plasmon cavity and J-aggregates hybrid system

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Abstract

Strong coupling systems enable coherent energy exchange between a light field and material electrons in nanoscale space. Active manipulation of this phenomenon by external stimuli is crucial for the design of advanced optoelectronic devices. Two neglected points severely hinder the improvement of tuning accuracy: irreversible variation in cavity morphology and lack of control over the dielectric environment which may change during the coupling process. Here we present a chemical fine-tuning of the strong plasmon–exciton coupling process in tailored Au@Ag nanocavities. The silver shell thickness was carefully controlled to tune the plasmon resonance wavelength with an accuracy of ∼8 nm and facilitate hot spots at the edges to boost the plasmon–exciton coupling strength. Hybrid polariton states were further regulated across the zero-detuning point with a spectral accuracy of less than 1 nm via tuning the solvent refractive index, and a Rabi splitting as large as 194 meV was observed at room temperature. The fine-tuning of strong plasmon–exciton coupling by an adjacent dielectric environment provides a novel route to manipulate excitons in molecules and possesses great potential for chemical or biological sensing.

Graphical abstract: Fine-tuning of polariton energies in a tailored plasmon cavity and J-aggregates hybrid system

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Article information


Submitted
03 Sep 2020
Accepted
26 Oct 2020
First published
27 Oct 2020

Nanoscale, 2020,12, 23069-23076
Article type
Paper

Fine-tuning of polariton energies in a tailored plasmon cavity and J-aggregates hybrid system

K. Liang, J. Guo, Y. Huang and L. Yu, Nanoscale, 2020, 12, 23069
DOI: 10.1039/D0NR06376B

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