“School of Nano-Sciences”
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| Paper IPM / Nano-Sciences / 17957 |
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Overshadowed by the electric dipole ones, the magnetic dipole transitions of a quantum emitter are hard to probe. This can be remedied by using pure magnetic hotspots, which host strong magnetic but quite weak electric fields in a subwavelength region. Utilizing the multiparticle Mie theory, we demonstrate pure magnetic hotspots via hollow silicon nanoparticles arranged in a ring configuration and illuminated by Bessel cylindrical vector beams. Normalized local field admittances of about $10^5$ - $10^7$
and magnetic field enhancements of about 10 - 30 are achievable. Moreover, the peak of the magnetic field enhancement can be shifted about 370nm via the hollow size. In other words, the pure magnetic hotspot can be optimized for a particular magnetic dipole transition.
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