Abstract
Hair-thin strands of multimode optical fibre (MMF) can operate as ultra-low footprint endoscopes–delivering sub-cellular resolution images from deep inside the body at the tip of a fine needle. However, images transmitted through MMFs are unrecognisably distorted. Here we present two new ways to unscramble this light and recover images. Firstly, we describe a new in-situ calibration technique requiring access to only the input end of the fibre–promising a way to image through flexible fibres. Secondly, we describe the design of a new optical element–an ‘optical inverter’–that can unscramble all modes in parallel, offering the potential of single-shot and super-resolution imaging through MMFs.
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