Journal
OPTICS EXPRESS
Volume 17, Issue 23, Pages 21030-21041Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.17.021030
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Funding
- Air Force Office of Scientific Research through a Multiple University Research Initiative [FA9550-06-1-0279]
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Utilizing non-resonant metamaterial elements, we demonstrate that complex gradient index optics can be constructed exhibiting low material losses and large frequency bandwidth. Although the range of structures is limited to those having only electric response, with an electric permittivity always equal to or greater than unity, there are still numerous metamaterial design possibilities enabled by leveraging the non-resonant elements. For example, a gradient, impedance matching layer can be added that drastically reduces the return loss of the optical elements due to reflection. In microwave experiments, we demonstrate the broadband design concepts with a gradient index lens and a beam-steering element, both of which are confirmed to operate over the entire X-band ( roughly 812 GHz) frequency spectrum. (C) 2009 Optical Society of America
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