Programmable metasurfaces can endow complex scattering environments with reconfigurability. Here, we make use of these configurational degrees of freedom to retrieve the impulse response between two passive antennas via cross-correlation techniques. An ensemble of stirred chaotic wave fields in a reverberation chamber (RC) can play the role of thermal noise in passive Green's function retrieval. Instead of using a conventional mechanical mode stirrer, we generate the ensemble of RC configurations with random configurations of a programmable metasurface. We adapt the data processing of the diffuse field cross-correlation technique to this stirring mechanism, which is, given the size of the RC, nominally inefficient, and we investigate the convergence of the cross-correlated signals toward the impulse response. Finally, we apply our scheme to phaseless imaging in complex propagation environments, with potential applications in indoor context-awareness.
Diffuse field cross-correlation in a programmable-metasurface-stirred reverberation chamber
Philipp del Hougne, Jérôme Sol, Fabrice Mortessagne, Ulrich Kuhl, Olivier Legrand, Philippe Besnier, Matthieu Davy; Diffuse field cross-correlation in a programmable-metasurface-stirred reverberation chamber. Appl. Phys. Lett. 8 March 2021; 118 (10): 104101. https://doi.org/10.1063/5.0039596
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