期刊
NANO LETTERS
卷 15, 期 9, 页码 6128-6134出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b02407
关键词
magnetic squeezing dark plasmons; Fano resonances; plasmonic antennas; artificial magnetism
类别
资金
- European Research Council under the European Union/ERC [616213]
Outstanding results have been achieved in the localization of optical electric fields via ultrasmall plasmonic cavities, paving the way to the subdiffractive confinement of local electromagnetic fields. However, due to the intrinsic constraints related to conventional architectures, no comparable squeezing factors have been managed yet for the magnetic counterpart of radiation, practically hindering the detection and manipulation of magneto-optical effects at the nanoscale. Here, we observe a strong magnetic field nanofocusing in the infrared, promoted by the induction of a coil-type Fano resonance. By triggering the coil current via a quadrupole-like plasmonic mode, we straightforwardly boost the enhancement of the infrared magnetic field and perform its efficient squeezing in localized nanovolumes.
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