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

Aaron V. Diebold, Mohammadreza F. Imani, Timothy Sleasman, David R. Smith

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)2142-2149
Number of pages8
JournalApplied Optics
Volume57
Issue number9
DOIs
StatePublished - Mar 20 2018

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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