Magnetic dipole super-resonances and their impact on mechanical forces at optical frequencies

Iñigo Liberal, Iñigo Ederra, Ramón Gonzalo, Richard W. Ziolkowski

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)8640-8653
Number of pages14
JournalOptics Express
Issue number7
StatePublished - 2014

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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