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 and Boris Luk’yanchuk
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Arseniy I. Kuznetsov: Data Storage Institute, A*STAR (Agency for Science, Technology and Research)
Andrey E. Miroshnichenko: Nonlinear Physics Centre, Research School of Physics and Engineering, Australian National University
Yuan Hsing Fu: Data Storage Institute, A*STAR (Agency for Science, Technology and Research)
Vignesh Viswanathan: National University of Singapore
Mohsen Rahmani: Data Storage Institute, A*STAR (Agency for Science, Technology and Research)
Vytautas Valuckas: Data Storage Institute, A*STAR (Agency for Science, Technology and Research)
Zhen Ying Pan: Data Storage Institute, A*STAR (Agency for Science, Technology and Research)
Yuri Kivshar: Nonlinear Physics Centre, Research School of Physics and Engineering, Australian National University
Daniel S. Pickard: National University of Singapore
Boris Luk’yanchuk: Data Storage Institute, A*STAR (Agency for Science, Technology and Research)

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms4104

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