Terahertz All-Dielectric Magnetic Mirror Metasurfaces

Research output: Contribution to journalArticle

Authors

  • Zhijie Ma
  • Pablo Albella
  • Binghao Ng
  • Hsiao Tzu Lu
  • Yandong Gong
  • Stefan A. Maier
  • Minghui Hong

Colleges, School and Institutes

External organisations

  • NUS Graduate School for Integrative Sciences and Engineering
  • National University of Singapore
  • Imperial College London
  • Institute for Infocomm Research, A-Star, Singapore
  • A STAR

Abstract

We demonstrate an all-dielectric metasurface operating in the terahertz band that is capable of engineering a reflected beam's spatial properties with high efficiency. The metasurface is formed from an array of silicon cube resonators which simultaneously support electric and magnetic dipolar Mie resonances. By controlling the interference between these modes, the amplitude and phase of a reflected wave can be arbitrarily controlled over a subwavelength area. We demonstrate the flexibility and utility of this metasurface by optimizing the surface to produce several reflected beam types including vortex and Bessel beams; the latter being useful for diffraction-free point-to-point terahertz communications. Additionally, we show theoretically and experimentally how the metasurface can produce an all-dielectric magnetic mirror in the terahertz band.

Details

Original languageEnglish
Pages (from-to)1010-1018
Number of pages9
JournalACS Photonics
Volume3
Issue number6
Early online date11 May 2016
Publication statusPublished - 15 Jun 2016

Keywords

  • all-dielectric metamaterials, Bessel beam, magnetic mirror, metasurface, Mie resonance, terahertz