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Title: Hybrid dielectric-plasmonic nanoantenna with multiresonances for subwavelength photon sources
Authors: Dmitriev, Pavel A.
Lassalle, Emmanuel
Ding, Lu
Pan, Zhenying
Neo, Darren C. J.
Valuckas, Vytautas
Paniagua-Dominguez, Ramón
Yang, Joel K. W.
Demir, Hilmi Volkan
Kuznetsov, Arseniy I.
Keywords: Science::Physics::Optics and light
Issue Date: 2023
Source: Dmitriev, P. A., Lassalle, E., Ding, L., Pan, Z., Neo, D. C. J., Valuckas, V., Paniagua-Dominguez, R., Yang, J. K. W., Demir, H. V. & Kuznetsov, A. I. (2023). Hybrid dielectric-plasmonic nanoantenna with multiresonances for subwavelength photon sources. ACS Photonics, 10(3), 582-594.
Project: SERC 1527300025 
Journal: ACS Photonics 
Abstract: The enhancement of the photoluminescence of 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 by an experimental demonstration. Most of the realizations use plasmonic platforms, and some also use all-dielectric nanoantennas, but hybrid dielectric-plasmonic (subwavelength) nanostructures have been very little explored. In this paper, we propose and demonstrate single subwavelength hybrid dielectric-plasmonic optical nanoantennas coupled to localized quantum dot emitters that constitute efficient and bright unidirectional photon sources under optical pumping. To achieve this, we devised a silicon nanoring sitting on a gold mirror with a 10 nm gap in-between, where an assembly of colloidal quantum dots is embedded. Such a structure supports both (radiative) antenna mode and (nonradiative) gap mode resonances, which we exploit for the dual purpose of out-coupling the light emitted by the quantum dots into the far-field with out-of-plane directivity, and for enhancing the excitation of the dots by the optical pump. Moreover, almost independent control of the resonance spectral positions can be achieved by simple tuning of geometrical parameters such as the ring inner and outer diameters, allowing us to conveniently adjust these resonances with respect to the quantum dots emission and absorption wavelengths. Using the proposed architecture, we obtain experimentally average fluorescence enhancement factors up to $654\times$ folds mainly due to high radiative efficiencies, and associated with a directional emission of the photoluminescence into a cone of $\pm 17\degree$ in the direction normal to the sample plane. We believe the solution presented here to be viable and relevant for the next generation of light-emitting devices.
ISSN: 2330-4022
DOI: 10.1021/acsphotonics.2c01332
Schools: School of Electrical and Electronic Engineering 
School of Physical and Mathematical Sciences 
School of Materials Science and Engineering 
Organisations: Institute of Materials Research and Engineering, A*STAR
Research Centres: LUMINOUS! Centre of Excellence for Semiconductor Lighting & Displays 
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Photonics, copyright © 2023 American Chemical Society, after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
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