Split-ball resonator as a three-dimensional analogue of planar split-rings

Arseniy I. Kuznetsov*, Andrey E. Miroshnichenko, Yuan Hsing Fu, Vignesh Viswanathan, Mohsen Rahmani, Vytautas Valuckas, Zhen Ying Pan, Yuri Kivshar, Daniel S. Pickard, Boris Luk'Yanchuk

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    49 Citations (Scopus)

    Abstract

    Split-ring resonators are basic elements of metamaterials, which can induce a magnetic response in metallic nanosctructures. Tunability of such response up to the visible frequency range is still a challenge. Here we introduce the concept of the split-ball resonator and demonstrate the strong magnetic response in the visible for both gold and silver spherical plasmonic nanoparticles with nanometre scale cuts. We realize this concept experimentally by employing the laser-induced transfer method to produce near-perfect metallic spheres and helium ion beam milling to make cuts with the clean straight sidewalls and nanometre resolution. The magnetic resonance is observed at 600 nm in gold and at 565 nm in silver nanoparticles. This method can be applied to the structuring of arbitrary three-dimensional features on the surface of nanoscale resonators. It provides new ways for engineering hybrid resonant modes and ultra-high near-field enhancement.

    Original languageEnglish
    Article number3104
    JournalNature Communications
    Volume5
    DOIs
    Publication statusPublished - 16 Jan 2014

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