Journal
ADVANCED OPTICAL MATERIALS
Volume 1, Issue 4, Pages 327-333Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201200022
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Funding
- SLAC National Accelerator Laboratory LDRD award
- Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-AC02-76SF00515]
- U.S. Department of Energy [DE-EE0005331]
- Robert L. and Audrey S. Hancock Stanford Graduate Fellowship
- Programa de perfeccionamiento de doctores y doctoras en el extranjero del Departamento de Educacion, Universidades e Investigacion del Gobierno Vasco
- Air Force Office of Scientific Research Young Investigator Grant [FA9550-11-1-0024]
- National Science Foundation CAREER Award [DMR-1151231]
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A broadband metamaterial presenting negative indices across hundreds of nanometers in the visible and near-infrared spectral regimes is demonstrated theoretically, using transformation optics to design the metamaterial constituents. The approach begins with an infinite plasmonic waveguide that supports a broadband but dark (i.e, not easily optically accessed) negative index mode. Conformal mapping of this waveguide to a finite split-ring-resonator-type structure transforms this mode into a bright (i.e, efficiently excited) resonance composed of degenerate electric and magnetic dipoles. A periodic array of such resonators exhibits negative refractive indices at optical frequencies in multiple regions exceeding 200 nm in bandwidth. The metamaterial response is confirmed through simulations of plane-wave refraction through a metamaterial prism. These results illustrate the power of transformation optics for new metamaterial designs and provide a foundation for future broadband metamaterial devices.
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