Flexible fiber-optic endoscopes provide a solution for imaging at depths beyond the reach of conventional microscopes. Current endoscopes require focusing and/or scanning mechanisms at the distal end, which limit miniaturization, frame-rate, and field of view. Alternative wavefront-shaping based lensless solutions are extremely sensitive to fiber-bending. We present a lensless, bend-insensitive, single-shot imaging approach based on speckle-correlations in fiber bundles that does not require wavefront shaping. Our approach computationally retrieves the target image by analyzing a single camera frame, exploiting phase information that is inherently preserved in propagation through convnetional fiber bundles. Unlike conventional fiber-based imaging, planar objects can be imaged at variable working distances, the resulting image is unpixelated and diffraction-limited, and miniaturization is limited only by the fiber diameter.
Bibliographical noteFunding Information:
This work was supported by the LabEx ENS-ICFP: ANR-10-LABX-0010/ANR-10-IDEX-0001-02 PSL; the CNRS/Weizmann NaBi European Associated Laboratory; The Aix-Marseille University/Hebrew University of Jerusalem collaborative-research joint program. The work was funded by the European Research Council (grants no. 278025 and 677909). O.K. was supported by an Azrieli Faculty Fellowship and the Marie Curie Intra-European Fellowship for career development (IEF). The authors thank Mickael Mounaix and Cathie Ventalon for their valuable help.
© 2016 Optical Society of America.