Hybrid Dielectric-Plasmonic Nanoantenna with Multiresonances for Subwavelength Photon Sources

The enhancement of the photoluminescence quantum dots induced by an optical nanoantenna has been studied considerably, but there is still significant interest in optimizing and miniaturizing such structures, especially when accompanied experimental demonstration. Most realizations use plasmonic platforms, some also all-dielectric nanoantennas, hybrid dielectric-plasmonic (subwavelength) nanostructures have very little explored. In this paper, we propose demonstrate single subwavelength nanoantennas coupled to localized dot emitters that constitute efficient bright unidirectional photon sources under pumping. To achieve this, devised a silicon nanoring sitting on gold mirror with 10 nm gap in-between, where assembly colloidal embedded. Such structure supports both (radiative) antenna mode (nonradiative) resonances, which exploit for dual purpose out-coupling light emitted into far-field out-of-plane directivity, enhancing excitation pump. Moreover, almost independent control resonance spectral positions can be achieved simple tuning geometrical parameters as ring inner outer diameters, allowing us conveniently adjust these resonances respect emission absorption wavelengths. Using proposed architecture, obtain experimentally average fluorescence factors up 654× folds mainly due high radiative efficiencies, associated directional cone ±17° direction normal sample plane. We believe solution presented here viable relevant next generation light-emitting devices.