Journal
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
Volume 369, Issue 1950, Pages 3434-3446Publisher
ROYAL SOC
DOI: 10.1098/rsta.2011.0159
Keywords
metamaterial; nanowire; porous alumina; bottom-up fabrication
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Funding
- US Army Research Office (ARO) MURI [50432-PH-MUR]
- National Science Council of Taiwan [NSC 95-3114-P-001-007-MY3]
- Academia Sinica of Taiwan
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Indefinite optical properties, which are typically characterized by hyperbolic dispersion relations, have not been observed in naturally occurring materials, but can be realized through a metamaterial approach. We present here the design, fabrication and characterization of nanowire metamaterials with indefinite permittivity, in which all-angle negative refraction of light is observed. The bottom-up fabrication technique, which applies electrochemical plating of nanowires in porous alumina template, is developed and demonstrated in achieving uniform hyperbolic optical properties at a large scale. We developed techniques to improve the uniformity and to reduce the defect density in the sample. The non-magnetic design and the off-resonance operation of the nanowire metamaterials significantly reduce the energy loss of electromagnetic waves and make the broad-band negative refraction of light possible.
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