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Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials
Published on: March 23, 2017
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Split-ball resonator as a three-dimensional analogue of planar split-rings
Arseniy I Kuznetsov1, Andrey E Miroshnichenko2, Yuan Hsing Fu1
1Data Storage Institute, A*STAR (Agency for Science, Technology and Research), 5 Engineering Drive 1, 117608 Singapore, Singapore.
Nature Communications
|January 17, 2014
Summary
Researchers developed split-ball resonators for visible-frequency metamaterials. These metallic nanoparticles exhibit strong magnetic responses, paving the way for advanced optical applications.
Area of Science:
- Plasmonics and Nanophotonics
- Metamaterials Science
Background:
- Split-ring resonators are fundamental to metamaterials, enabling magnetic responses in metallic nanostructures.
- Achieving tunable magnetic responses in the visible frequency range remains a significant challenge.
Purpose of the Study:
- To introduce and demonstrate the split-ball resonator concept for visible-frequency magnetic responses.
- To engineer nanoscale resonators with tunable optical properties.
Main Methods:
- Fabrication of near-perfect metallic spheres using laser-induced transfer.
- Creation of nanometre-scale cuts on spherical nanoparticles via helium ion beam milling.
- Experimental observation and characterization of magnetic resonance.
Main Results:
- Demonstrated strong visible magnetic response in gold and silver split-ball resonators.
- Observed magnetic resonance at 600 nm for gold and 565 nm for silver nanoparticles.
- Achieved nanometre resolution cuts with clean, straight sidewalls.
Conclusions:
- The split-ball resonator concept enables strong magnetic responses in the visible spectrum.
- The fabrication method allows for precise structuring of nanoscale resonators.
- This work opens new avenues for engineering hybrid resonant modes and ultra-high near-field enhancement.
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