Phaseless computational ghost imaging at microwave frequencies using a dynamic metasurface aperture.

Journal Article (Journal Article)

We demonstrate a dynamic metasurface aperture as a unique tool for computational ghost imaging at microwave frequencies. The aperture consists of a microstrip waveguide loaded with an array of metamaterial elements, each of which couples energy from the waveguide mode to the radiation field. With a tuning mechanism introduced into each independently addressable metamaterial element, the aperture can produce diverse radiation patterns that vary as a function of tuning state. Here, we show that fields from such an aperture approximately obey speckle statistics in the radiative near field. Inspired by the analogy with optical correlation imaging, we use the dynamic aperture as a means of illuminating a scene with structured microwave radiation, receiving the backscattered intensity with a simple waveguide probe. By correlating the magnitude of the received signal with the structured intensity patterns, we demonstrate high-fidelity, phaseless imaging of sparse targets. The dynamic metasurface aperture as a novel ghost imaging structure can find application in security screening, through-wall imaging, as well as biomedical diagnostics.

Full Text

Duke Authors

Cited Authors

  • Diebold, AV; Imani, MF; Sleasman, T; Smith, DR

Published Date

  • March 2018

Published In

Volume / Issue

  • 57 / 9

Start / End Page

  • 2142 - 2149

PubMed ID

  • 29604010

Pubmed Central ID

  • 29604010

Electronic International Standard Serial Number (EISSN)

  • 1539-4522

International Standard Serial Number (ISSN)

  • 1559-128X

Digital Object Identifier (DOI)

  • 10.1364/ao.57.002142

Language

  • eng