Single-emitter super-resolved imaging of radiative decay rate enhancement in dielectric gap nanoantennas.

Autor: Córdova-Castro RM; Institut Langevin, ESPCI Paris, PSL University, CNRS, Paris, France.; Department of Physics, University of Ottawa, Ottawa, ON, Canada., van Dam B; Institut Langevin, ESPCI Paris, PSL University, CNRS, Paris, France., Lauri A; The Blackett Laboratory, Department of Physics, Imperial College London, London, UK., Maier SA; The Blackett Laboratory, Department of Physics, Imperial College London, London, UK.; School of Physics and Astronomy, Monash University, Clayton, Victoria, Australia.; Chair in Hybrid Nanosystems, Ludwig-Maximilians Universität München, Muenchen, Germany., Sapienza R; The Blackett Laboratory, Department of Physics, Imperial College London, London, UK., De Wilde Y; Institut Langevin, ESPCI Paris, PSL University, CNRS, Paris, France., Izeddin I; Institut Langevin, ESPCI Paris, PSL University, CNRS, Paris, France. ignacio.izeddin@espci.fr., Krachmalnicoff V; Institut Langevin, ESPCI Paris, PSL University, CNRS, Paris, France. valentina.krachmalnicoff@espci.fr.
Jazyk: angličtina
Zdroj: Light, science & applications [Light Sci Appl] 2024 Jan 02; Vol. 13 (1), pp. 7. Date of Electronic Publication: 2024 Jan 02.
DOI: 10.1038/s41377-023-01349-2
Abstrakt: High refractive index dielectric nanoantennas strongly modify the decay rate via the Purcell effect through the design of radiative channels. Due to their dielectric nature, the field is mainly confined inside the nanostructure and in the gap, which is hard to probe with scanning probe techniques. Here we use single-molecule fluorescence lifetime imaging microscopy (smFLIM) to map the decay rate enhancement in dielectric GaP nanoantenna dimers with a median localization precision of 14 nm. We measure, in the gap of the nanoantenna, decay rates that are almost 30 times larger than on a glass substrate. By comparing experimental results with numerical simulations we show that this large enhancement is essentially radiative, contrary to the case of plasmonic nanoantennas, and therefore has great potential for applications such as quantum optics and biosensing.
(© 2024. The Author(s).)
Databáze: MEDLINE
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