Fabrication of Crescent-Shaped Optical Antennas


  • This research was supported by the Bundesministerium für Bildung und Forschung (BMBF), grant No. 03N8702. J. S. S.-P. thanks the National Science Foundation for support in the form of a Directorate for Mathematical and Physical Sciences Distinguished International Postdoctoral Research Fellowship (MPS-DRF, award No. 0207088).


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Metal crescent-shaped nanoparticles (see Figure) that are expected to be efficient optical antennas with highly enhanced and localized near-fields are described. The particle-fabrication process combines colloidal templating, metal-film deposition, and ion-beam milling. The crescents exhibit multiple plasmon resonances in the visible and near-infrared that are of the same type as have been proposed for the development of an effective left-handed material.