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

Area of Science:

• Metamaterials and Nanophotonics
• Computational Imaging
• Microwave Engineering

Background:

• Computational ghost imaging typically relies on structured light patterns.
• Dynamic control over radiation patterns is crucial for advanced imaging techniques.

Purpose of the Study:

• To demonstrate a dynamic metasurface aperture for computational ghost imaging at microwave frequencies.
• To enable high-fidelity, phaseless imaging using structured microwave radiation.

Main Methods:

• Utilized a microstrip waveguide loaded with independently addressable metamaterial elements.
• Generated diverse radiation patterns by tuning metamaterial elements.
• Employed a simple waveguide probe to receive backscattered intensity.
• Correlated received signals with structured intensity patterns for image reconstruction.

Main Results:

• Demonstrated that fields from the dynamic metasurface aperture obey speckle statistics.
• Achieved high-fidelity, phaseless imaging of sparse targets.
• Showcased the aperture's ability to produce controllable, structured microwave radiation patterns.

Conclusions:

• The dynamic metasurface aperture is a novel and effective structure for ghost imaging.
• This technology has potential applications in security screening, through-wall imaging, and biomedical diagnostics.