Broadband gradient index microwave quasi-optical elements based on non-resonant metamaterials.

Journal Article (Journal Article)

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 8-12 GHz) frequency spectrum.

Full Text

Duke Authors

Cited Authors

  • Liu, R; Cheng, Q; Chin, JY; Mock, JJ; Cui, TJ; Smith, DR

Published Date

  • November 2009

Published In

Volume / Issue

  • 17 / 23

Start / End Page

  • 21030 - 21041

PubMed ID

  • 19997341

Electronic International Standard Serial Number (EISSN)

  • 1094-4087

International Standard Serial Number (ISSN)

  • 1094-4087

Digital Object Identifier (DOI)

  • 10.1364/oe.17.021030


  • eng