Multipolar-sensitive engineering of magnetic dipole spontaneous emission with a dielectric nanoresonator antenna

We propose an axisymmetric silicon nanoresonator with designed tapered angle well for the extraordinary enhancement of the decay rate of magnetic dipole (MD) emitters. Due to the resonant coupling of a MD emitter and the MD mode of the subwavelength resonator, the Purcell factor (PF) can easily reac...

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Bibliographic Details
Published in:Scientific reports 2021-06, Vol.11 (1), p.12813-12813, Article 12813
Main Authors: Habil, Mojtaba Karimi, Zapata–Rodríguez, Carlos J., Cuevas, Mauro, Entezar, Samad Roshan
Format: Article
Language:English
Subjects:
639/624
639/624/400/1103
Efficiency
Emissions
Humanities and Social Sciences
Magnetic fields
multidisciplinary
Nanoparticles
Radiation
Science
Science (multidisciplinary)
Semiconductors
Silicon
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Summary:We propose an axisymmetric silicon nanoresonator with designed tapered angle well for the extraordinary enhancement of the decay rate of magnetic dipole (MD) emitters. Due to the resonant coupling of a MD emitter and the MD mode of the subwavelength resonator, the Purcell factor (PF) can easily reach 500, which is significantly higher than the PF when using a silicon nanosphere of the same size. The PF and the resonance frequency are conveniently tuned through the resonator diameter and the taper angle of the blind hole. When supported by a metallic substrate, further enhancement ( > 10 3 ) of the MD spontaneous emission is triggered by an image-induced quadrupolar high- Q mode of the nanoantenna. For the sake of comparison we include a critical analysis of the canonical problem that considers a Si spherical shell. Our results might facilitate a novel strategy for promising realizations of chip-scale nanophotonic applications.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-021-92322-9