Hybridised exciton–polariton resonances in core–shell nanoparticles

Gentile, Martin J.; Barnes, William

doi:10.1088/2040-8986/aa5517

Cited by 12 publications

(14 citation statements)

References 42 publications

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“…In what follows we invert the material arrangement and consider dielectric NPs covered with homogeneous excitonic shells. For thick shells, the NP sustains not only an exciton resonance at fixed frequency, but also modes originating from its negative dielectric function, that become stronger as the shell increases [42,43]. Nevertheless, the optical response can still be precisely tuned by adjusting the silicon core.…”

Section: Resultsmentioning

confidence: 99%

Mie excitons: Understanding strong coupling in dielectric nanoparticles

et al. 2018

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We theoretically analyse the hybrid Mie-exciton optical modes arising from the strong coupling of excitons in organic dyes or transition-metal dichalcogenides with the Mie resonances of high-index dielectric nanoparticles. Detailed analytic calculations show that silicon-exciton core-shell nanoparticles are characterised by a richness of optical modes which can be tuned through nanoparticle dimensions to produce large anticrossings in the visible or near infrared, comparable to those obtained in plexcitonics. The complex magnetic-excitonic nature of these modes is understood through spectral decomposition into Mie-coefficient contributions, complemented by electric and magnetic near-field profiles. In the frequency range of interest, absorptive losses in silicon are sufficiently low to allow observation of several periods of Rabi oscillations in strongly coupled emitter-particle architectures, as confirmed here by discontinuous Galerkin time-domain calculations for the electromagnetic field beat patterns. These results suggest that Mie resonances in high-index dielectrics are promising alternatives for plasmons in strong-coupling applications in nanophotonics, while the coupling of magnetic and electric modes opens intriguing possibilities for external control.

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Section: Resultsmentioning

confidence: 99%

Mie excitons: Understanding strong coupling in dielectric nanoparticles

et al. 2018

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“…Molecular strong coupling with Mie resonances in dielectric nanoparticles have been demonstrated theoretically 32,33 and experimentally. 34,35 On the other hand WGM based cavities like microdiscs and toroids have been utilized to strongly couple atoms, 36 ions, 37 and quantum dots 38,39 at cryogenic temperatures.…”

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confidence: 98%

Molecular Monolayer Strong Coupling in Dielectric Soft Microcavities

Vasista

Barnes

2020

Nano Lett.

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We report strong coupling of a monolayer of J -aggregated dye molecules to the whispering gallery modes of a dielectric microsphere at room temperature. We systematically studied the evolution of strong coupling as the number of layers of dye molecules was increased, we found the Rabi splitting to rise from 56 meV for a single layer to 94 meV for four layers of dye molecules. We compare our experimental results with 2D numerical simulations and a simple coupled oscillator model, finding good agreement.We anticipate that these results will act as a stepping stone for integrating moleculecavity strong coupling in a microfluidic environment since microspheres can be easily trapped and manipulated in such an environment, and provide open access cavities.

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“…The small nanoshell dimensions explored here ensure that it is clearly discernible in the extinction spectra. Such modes were recently explored as substitutes for plasmons in metals for applications in nanophotonics [94]. In Fig.…”

Section: Resultsmentioning

confidence: 99%

Robustness of the Rabi Splitting under Nonlocal Corrections in Plexcitonics

Tserkezis¹,

Wubs²,

Mortensen

2017

ACS Photonics

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We explore theoretically how nonlocal corrections in the description of the metal affect the strong coupling between excitons and plasmons in typical examples where nonlocal effects are anticipated to be strong, namely small metallic nanoparticles, thin metallic nanoshells or dimers with narrow separations, either coated with or encapsulating an excitonic layer. Through detailed simulations based on the generalised nonlocal optical response theory, which simultaneously accounts both for modal shifts due to screening and for surface-enhanced Landau damping, we show that, contrary to expectations, the influence of nonlocality is rather limited, as in most occasions the width of the Rabi splitting remains largely unaffected and the two hybrid modes are well distinguishable. We discuss how this behaviour can be understood in view of the popular coupled-harmonic-oscillator model, while we also provide analytic solutions based on Mie theory to describe the hybrid modes in the case of matryoshka-like single nanoparticles. Our analysis provides an answer to a so far open question, that of the influence of nonlocality on strong coupling, and is expected to facilitate the design and study of plexcitonic architectures with ultrafine geometrical details.

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Hybridised exciton–polariton resonances in core–shell nanoparticles

Cited by 12 publications

References 42 publications

Mie excitons: Understanding strong coupling in dielectric nanoparticles

Mie excitons: Understanding strong coupling in dielectric nanoparticles

Molecular Monolayer Strong Coupling in Dielectric Soft Microcavities

Robustness of the Rabi Splitting under Nonlocal Corrections in Plexcitonics

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