An Idea for Measuring Spatial Coherency Matrices by Multiplexing Across a Reconfigurable Complex System onto a Single-Port Intensity Detector

P. del Hougne Univ Rennes, CNRS, IETR - UMR 6164, F-35000 Rennes, France

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We propose a technique for measuring the spatial coherency matrix of a wavefront based on a single-port intensity detector. Our method relies on multiplexing the incident wavefront across a series of known realizations of a reconfigurable complex system onto the intensity detector. We consider a multi-port chaotic cavity with partially reconfigurable boundary conditions as an embodiment of the reconfigurable complex system. This matches recent experiments with 3D chaotic cavities whose walls are partially covered with a programmable metasurface. We formulate a system model that rigorously accounts for multiple scattering based on multi-port network theory. Then, we numerically validate the principle. The appeal of our technique lies in the low hardware complexity.

DOI:10.12693/APhysPolA.148.S39 topics: coherency matrix, multiplexing, programmable metasurface, single-pixel camera