Low-loss impedance-matched optical metamaterials with zero-phase delay

Seokho Yun, Zhi Hao Jiang, Qian Xu, Zhiwen Liu, Douglas Henry Werner, Theresa S. Mayer

Research output: Contribution to journalArticlepeer-review

67 Scopus citations


Metamaterials have dramatically expanded the range of available optical properties, enabling an array of new devices such as superlenses, perfect absorbers, and ultrafast switches. Most research has focused on demonstrating negative- and high-index metamaterials at terahertz and optical wavelengths. However, far less emphasis has been placed on low-loss near-zeroindex metamaterials that exhibit unique properties including quasi-infinite phase velocity and infinite wavelength. Here, we experimentally demonstrate a free-standing metallodielectric fishnet nanostructure that has polarization-insensitive, zero-index properties with nearly ideal transmission at 1.55 μm. This goal was achieved by optimizing the metamaterial geometry to allow both its effective permittivity and permeability to approach zero together, which simultaneously produces a zero index and matched impedance to free space. The ability to design and fabricate low-loss, near-zero-index optical metamaterials is essential for new devices such as beam collimators, zero-phase delay lines, and transformation optics lenses.

Original languageEnglish (US)
Pages (from-to)4475-4482
Number of pages8
JournalACS nano
Issue number5
StatePublished - May 22 2012

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • General Engineering
  • General Physics and Astronomy


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