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Perforated semishells: far-field directional control and optical frequency magnetic response
Nikolay A Mirin1, Tamer A Ali, Peter Nordlander
1Laboratory for Nanophotonics, Rice University, Houston, Texas 77005, USA.
ACS Nano
|May 1, 2010
Summary
Reduced-symmetry plasmonic semishells with perforations enable precise control over optical phenomena. Tailoring perforation shape and placement unlocks novel magnetic resonances and scattering profiles for metamaterial applications.
Area of Science:
- Plasmonics
- Nanophotonics
- Metamaterials
Background:
- Reduced-symmetry nanostructures offer unique optical properties.
- Plasmonic semishells with perforations present novel design possibilities.
- Fabrication is achievable using standard clean-room techniques.
Purpose of the Study:
- To investigate the optical properties of perforated plasmonic semishells.
- To understand how perforation geometry influences resonant modes and scattering.
- To explore the potential of these structures in metamaterial design.
Main Methods:
- Fabrication of perforated plasmonic semishells using clean-room techniques.
- Optical characterization of resonant modes and scattering profiles.
- Theoretical analysis and comparison with experimental results.
Main Results:
- Single perforations on the symmetry axis influence resonant modes based on size and shape.
- Off-axis perforations excite higher-order modes and complex near-field distributions.
- Wedge-like perforations act as 3D analogues of split-ring resonators, controlling magnetic mode frequencies.
Conclusions:
- Perforated plasmonic semishells provide a versatile platform for controlling optical phenomena.
- The geometry of perforations is key to tailoring nanoscale optical responses.
- These structures hold promise for advanced metamaterial applications.
