Focusing Beyond the Diffraction Limit with Far-Field Time Reversal

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Tutorial on seismic interferometry: Part 2 — Underlying theory and new advances (2010, background): “A mathematical derivation, based on reciprocity theory, formalizes this principle: The crosscorrelation of responses at two receivers, integrated over differ- ent sources, gives the Green’s function emitted by a virtual source at the position of one of the receivers and observed by the other…”
Ultrasound Localization Microscopy and Super-Resolution: A State of the Art (2018, neutral): “The development of metamaterials has also introduced new ideas around super-resolution by allowing super-focusing in the near field of resonant heterogeneities with electromagnetic waves [49].”
Time-Varying Metasurfaces and Lorentz Non-Reciprocity (2015, background): “Additionally, time-varying metasurfaces can be integrated with time-reversal mirrors[39-41] and used for subwavelength focusing[42] enabling the mapping of backward-signals or far-field images.”
Twelve Scientific Challenges for 6G: Rethinking the Foundations of Communications Theory (2022, methodology): “To address these challenges, a signature waveform design was introduced in [27].”