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Combining tunable metasurfaces with chaotic cavities opens new avenues forfinely tailored dynamic control of microwaves with programmable codingmetacavities (PCMs). There is currently a strong interest in utilizing PCMs toovercome the notorious difficulty of coherent measurements across largeapertures at radiofrequencies, with important applications in imaging andsensing for security screening, medical diagnosis and human-computerinteraction. Such approaches rely on multiplexing spatially encoded informationacross a random sequence of PCM coding patterns for single-portsingle-frequency acquisition. Here, it is shown that a judiciously tailoredrather than random coding sequence is necessary to unlock the full potential ofPCMs for analog multiplexing. Specifically, the singular value spectrum of themultiplexing channel matrix is tailored to be perfectly flat - as opposed todownward sloping. In-situ experiments show that thereby the number of necessarymeasurements to achieve a given reconstruction quality is lowered by a factorof 2.5. Computational imaging and other microwave metrology applications areexpected to benefit from the resulting reduction in acquisition time,processing burden and latency. The proposed approach and platform also set thestage for future studies in the emerging field of wave control throughengineered wave chaos.

Optimized Analog Information Multiplexing Across Custom-Tailored MetaCavity Configurations