Abstract
Abstract Light-matter interactions at the nanoscale constitute a fundamental ingredient for engineering applications in nanophotonics and quantum optics. In this regard, Mie resonances supported by high-refractive index dielectric nanoparticles have recently attracted interest, due to their lower losses and better control over the scattering patterns compared to their plasmonic counterparts. The emergence of several resonances in high-refractive index dielectric nanoparticles results in an overall high complexity, where the electric and magnetic dipoles can show a significant spectral overlap, especially at optical frequencies, thus hindering possible light-matter coupling mechanisms arising in the optical spectrum. This behavior can be properly adjusted by using non-spherical geometries, an approach that has already been successfully exploited to tune directional scattering from dielectric nanoresonators. Here, by using cylindrical nanoparticles, we show, experimentally and theoretically, the emergence of peak splitting for both magnetic and electric dipole resonances of individual silicon nanodisks coupled to a J-aggregated organic semiconductor. In the two cases, we find that the different character of the involved resonances leads to different light-matter coupling regimes. Crucially, our results show that the observed energy splittings are of the same order of magnitude as the ones reported using similar plasmonic systems, thereby confirming dielectric nanoparticles as promising alternatives for localized strong coupling studies. The coupling of both the electric and magnetic dipole resonances can offer interesting possibilities for the control of directional light scattering in the strong coupling regime and the dynamic tuning of nanoscale light-matter hybrid states by external fields.
Highlights
Light-matter interactions constitute a fundamental field of study in photonics, since it opens routes for exploring novel physical phenomena and for exploiting applications in optoelectronics and quantum optics [1]
The spectra have been calculated for an isolated ND in air, with the aid of the extended boundary-condition method (EBCM) for the evaluation of the scattering T-matrix of non-spherical particles [50]
We emphasize that since the peak splitting behavior, as we will show in the following, is well reproduced by numerical calculations with both the extended layer multiple scattering (ELMS) [57] and the discontinuous Galerkin time-domain (DGTD) method [58, 59], it is reasonable to assume the numerical linewidth as a reference for the strong coupling threshold estimation
Summary
Light-matter interactions constitute a fundamental field of study in photonics, since it opens routes for exploring novel physical phenomena and for exploiting applications in optoelectronics and quantum optics [1]. The field started growing around high quality-factor cavities with extremely low losses and diffraction-limited mode volumes [2, 3], in recent years increasing interest has been devoted to pushing the research down to the nanoscale by using open nanocavities, with the promise of shrinking light-matter interaction lengths down to scales much smaller than a single wavelength [4] and manipulating the generation of nonclassical light by quantum emitters [5] In this regard, plasmonic resonances localized in metallic nanoparticles have so far been the preferential studied platform [6]. This behavior can be understood in terms of the different near-field profiles of the two resonances, resulting in a different overlap with the surrounding excitonic layer
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