Exploiting multimode waveguides for pure fibre-based imaging
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There has been an immense drive in modern microscopy towards miniaturisation and ﬁbre based technology. This has been necessitated by the need to access hostile or diffcult environments in-situ and in-vivo. Strategies to date have included the use of specialist ﬁbres and miniaturised scanning systems accompanied by ingenious microfabricated lenses. We present a novel approach for this ﬁeld by utilising disordered light within a standard multimode optical ﬁbre for lensless microscopy and optical mode conversion. We demonstrate the modalities of bright-ﬁeld and dark-ﬁeld imaging and scanning ﬂuorescence microscopy at acquisition rates allowing observation of dynamic processes such as Brownian motion of mesoscopic particles. Furthermore, we show how such control can realise a new form of mode converter and generate various types of advanced light ﬁelds such as propagation-invariant beams and optical vortices. These may be useful for future ﬁbre based implementations of super-resolution or light sheet microscopy.
Cizmar , T & Dholakia , K 2012 , ' Exploiting multimode waveguides for pure fibre-based imaging ' Nature Communications , vol 3 , 1027 . DOI: 10.1038/ncomms2024
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We acknowledge support from the UK Engineering and Physical Science Research Council
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