Memory effect assisted imaging through multimode optical fibres

Shuhui Li (), Simon A. R. Horsley, Tomáš Tyc, Tomáš Čižmár and David B. Phillips ()
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Shuhui Li: University of Exeter
Simon A. R. Horsley: University of Exeter
Tomáš Tyc: Faculty of Science, Masaryk University
Tomáš Čižmár: Institute of Scientific Instruments of CAS
David B. Phillips: University of Exeter

Nature Communications, 2021, vol. 12, issue 1, 1-13

Abstract: Abstract When light propagates through opaque material, the spatial information it holds becomes scrambled, but not necessarily lost. Two classes of techniques have emerged to recover this information: methods relying on optical memory effects, and transmission matrix (TM) approaches. Here we develop a general framework describing the nature of memory effects in structures of arbitrary geometry. We show how this framework, when combined with wavefront shaping driven by feedback from a guide-star, enables estimation of the TM of any such system. This highlights that guide-star assisted imaging is possible regardless of the type of memory effect a scatterer exhibits. We apply this concept to multimode fibres (MMFs) and identify a ‘quasi-radial’ memory effect. This allows the TM of an MMF to be approximated from only one end - an important step for micro-endoscopy. Our work broadens the applications of memory effects to a range of novel imaging and optical communication scenarios.

Date: 2021
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DOI: 10.1038/s41467-021-23729-1

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