Abstract
Artificial magnetism enables various transformative optical phenomena, including negative refraction, Fano resonances, and unconventional nanoantennas, beamshapers, polarization transformers and perfect absorbers, and enriches the collection of electromagnetic field control mechanisms at optical frequencies. We demonstrate that it is possible to excite a magnetic dipole super-resonance at optical frequencies by coating a silicon nanoparticle with a shell impregnated with active material. The resulting response is several orders of magnitude stronger than that generated by bare silicon nanoparticles and is comparable to electric dipole super-resonances excited in spaser-based nanolasers. Furthermore, this configuration enables an exceptional control over the optical forces exerted on the nanoparticle. It expedites huge pushing or pulling actions, as well as a total suppression of the force in both far-field and near-field scenarios. These effects empower advanced paradigms in electromagnetic manipulation and microscopy.
Highlights
Because of the inherent weakness of the magnetic response of matter at optical frequencies [1, 2], there has been a great deal of excitement in the recent development of artificial magnetic properties based on metamaterial-inspired concepts [3,4,5,6]
We demonstrate that it is possible to boost the magnetic dipole resonance response of a Si nanosphere by several orders of magnitude by coating it with a shell impregnated with an active material
We have demonstrated that it is possible to boost the magnetic dipole resonances present in Si nanoparticles by covering them with a shell impregnated with an active material
Summary
Because of the inherent weakness of the magnetic response of matter at optical frequencies [1, 2], there has been a great deal of excitement in the recent development of artificial magnetic properties based on metamaterial-inspired concepts [3,4,5,6] This ability to tailor magnetic, as well as electric optical responses has facilitated the pursuit of negative refraction [3], cloaking [7, 8] and perfect lensing [9]. We demonstrate that an active shell provides the degrees of freedom necessary to produce huge accelerating and/or dragging forces, as well as a complete suppression of the forces exerted on the nanoparticle in both far-field and near-field scenarios, even when it is re-radiating a significant amount of power These force-related results empower us to envisage advanced paradigms in electromagnetic manipulation, particle sorting and microscopy
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