High-throughput imaging of self-luminous objects through a single optical fibre

Barankov, Roman; Mertz, Jérôme

doi:10.1038/ncomms6581

Cited by 32 publications

(29 citation statements)

References 25 publications

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“…Once the TM is known, it can be inverted to descramble any transmitted image [19,22,43,47,49]. Other promising computational approaches are under development, such as the use of spectral encoding [98]. Computational imaging methods 'descramble' a speckle pattern in order to look through a scattering medium.…”

Section: Computational Imagingmentioning

confidence: 99%

Feedback-based wavefront shaping

Vellekoop¹

2015

Opt. Express

375

269

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Light scattering was thought to be the fundamental limitation for the depth at which optical imaging methods can retain their resolution and sensitivity. However, it was shown that light can be focused inside even the most strongly scattering objects by spatially shaping the wavefront of the incident light. This review summarizes recently developed feedback-based approaches for focusing light inside and through scattering objects.

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Section: Computational Imagingmentioning

confidence: 99%

Feedback-based wavefront shaping

Vellekoop¹

2015

Opt. Express

375

269

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“…Multimode optical fibers (MMFs) have attracted much attention lately due to practical applications in communication [21,22], imaging [23][24][25][26][27][28][29][30] and spectroscopy [31][32][33][34][35]. Intrinsic imperfections (like an inhomogeneity of the refractive index in the fiber) and external perturbations (such as those causing a cross-section deformation) lead to coupling of the guided modes.…”

Section: Introductionmentioning

confidence: 99%

Principal modes in multimode fibers: exploring the crossover from weak to strong mode coupling

et al. 2017

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We present experimental and numerical studies on principal modes in a multimode fiber with mode coupling. By applying external stress to the fiber and gradually adjusting the stress, we have realized a transition from weak to strong mode coupling, which corresponds to the transition from single scattering to multiple scattering in mode space. Our experiments show that principal modes have distinct spatial and spectral characteristic in the weak and strong mode coupling regimes. We also investigate the bandwidth of the principal modes, in particular, the dependence of the bandwidth on the delay time, and the effects of the mode-dependent loss. By analyzing the path-length distributions, we discover two distinct mechanisms that are responsible for the bandwidth of principal modes in weak and strong mode coupling regimes. Their interplay leads to a non-monotonic transition of the average principal mode bandwidth from weak to strong mode coupling. Taking into account the mode-dependent loss in the fiber, our numerical results are in qualitative agreement with our experimental observations. Our study paves the way for exploring potential applications of principal modes in communication, imaging and spectroscopy.

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“…They enable imaging at depths where scattering prevents noninvasive microscopic investigation. An ideal microendoscopic probe should be flexible, allow real-time diffraction-limited imaging at various working distances from its facet, while maintaining a minimal cross-sectional footprint [1,2].Single-mode fibers (SMF) can be used as small diameter light-guides for endoscopic imaging, but in order to obtain two-dimensional (2D) images a mechanical scanning head [1,2] or a spectral disperser [3,4] should be mounted at the distal end of a fiber, sacrificing frame-rate and probe size or resolution. Alternatively, 2D image information can be delivered by the different modes of a multimode fiber (MMF), if the complex phase randomization and mode mixing of the MMF is measured and compensated for, computationally or via wavefront-shaping [5,6,7,8,9,10,11,12].…”

mentioning

confidence: 99%

Widefield lensless imaging through a fiber bundle via speckle correlations

Porat¹,

Andresen²,

Rigneault³

et al. 2016

Opt. Express

118

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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.

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High-throughput imaging of self-luminous objects through a single optical fibre

Cited by 32 publications

References 25 publications

Feedback-based wavefront shaping

Feedback-based wavefront shaping

Principal modes in multimode fibers: exploring the crossover from weak to strong mode coupling

Widefield lensless imaging through a fiber bundle via speckle correlations

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