Optical memory effect in square multimode fibers

Caravaca-Aguirre, Antonio M.; Carron, Adrien; Mézil, Sylvain; Wang, Irène; Bossy, Emmanuel

doi:10.1364/ol.436134

Cited by 8 publications

(10 citation statements)

References 17 publications

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“…2 shows that, when the input shift direction is along an edge of the square core, the focus splits into two spots, while, in the general case, it splits into four spots moving in symmetrical directions. These results confirms the existence of the memory effect directly from the translation of a focal spot, which was to date only demonstrated via crosscorrelation of speckle patterns [20,21]. The intensities of these spots, normalized by the initial focus intensity, are lower than the values predicted for the ideal case (1/4 for the two-spots case and 1/16 for the four-spots case, although the ratio between two and four spots is preserved.…”

supporting

confidence: 79%

“…The method proposed here has the advantage to provide a straightforward reconstruction from a single scan, directly through a focus-scanning microscopy approach. Starting from a focused spot that we first obtain by use of a guide-star, we indeed demonstrate that the memory effect allows to simply scan four foci across the sample plane, as opposed to the previous observation that reported shifting peaks in the correlation domain [20,21]. These spots can be scanned around the guide-star generated focus, over what we will call an isoplanetic patch, defined by the observed range of the memory effect, typically ∼10 µin our experiment.…”

mentioning

confidence: 49%

“…Recently, a special type of shift-shift memory effect in square-core multimode fibers (SqMMFs) has been observed [20]. It has the ability to produce twodimensional (2D) translations of the output pattern, as opposed to the sole azimuthal rotation reported in circular MMFs.…”

mentioning

confidence: 99%

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Imaging through a square multimode fiber by scanning focused spots with the memory effect

Mézil¹,

Wang²,

Bossy³

2023

Preprint

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The existence of a shift-shift memory effect, whereby any translation of the input field induces translations in the output field in four symmetrical directions, has been observed in square waveguides by correlation measurements. Here we demonstrate that this memory effect is also observed in real space and can be put to use for imaging purposes. First, a focus is created at the output of a square-core multimode fiber, by wavefront shaping based on feedback from a guide-star. Then, thanks to the memory effect, four symmetrical spots can be scanned at the fiber output by shifting the wavefront at the fiber input. We demonstrate that this property can be exploited to perform fluorescence imaging through the multimode fiber, without requiring the measurement of a transmission matrix.

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supporting

confidence: 79%

mentioning

confidence: 49%

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Imaging through a square multimode fiber by scanning focused spots with the memory effect

Mézil¹,

Wang²,

Bossy³

2023

Preprint

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“…When monochromatic light propagates through a MMF with a specific propagation constant, a quadratic radial phase modulation of the input wavefront will cause an axial shift of the output pattern [15]. More recently, the translational memory effect has been observed in MMFs with square crosssection [85]. Symmetry properties of the square-core fiber lead to speckle patterns shifting along four directions at the fiber output for any given shift direction at the input.…”

Section: Optical Memory Effectsmentioning

confidence: 99%

“…It has been shown that such disordered fibers can transport transversely localized beams with low cross-talk [254], facilitating image transfer [242][243][244][245][246] and secure information transmission [247]. Beyond conventional optical fibers, novel fiber structures have been designed and fabricated for target applications in recent years [85,255]. Moreover, novel applications of MMFs have been explored, e.g., optical computing and artificial neural networks, which will be described below.…”

Section: Disordered Fibersmentioning

confidence: 99%

Controlling light propagation in multimode fibers for imaging, spectroscopy, and beyond

Cao¹,

Čižmár²,

Turtaev³

et al. 2023

Adv. Opt. Photon.

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Light transport in a highly multimode fiber exhibits complex behavior in space, time, frequency and polarization, especially in the presence of mode coupling. The newly developed techniques of spatial wavefront shaping turn out to be highly suitable to harness such enormous complexity: a spatial light modulator enables precise characterization of field propagation through a multimode fiber, and by adjusting the incident wavefront it can accurately tailor the transmitted spatial pattern, temporal profile and polarization state. This unprecedented control leads to multimode fiber applications in imaging, endoscopy, optical trapping and microfabrication. Furthermore, the output speckle pattern from a multimode fiber encodes spatial, temporal, spectral and polarization properties of the input light, allowing such information to be retrieved from spatial measurements only. This article provides an overview of recent advances and breakthroughs in controlling light propagation in multimode fibers, and discusses newly emerging applications.

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Harnessing disorder for photonic device applications

Cao

Eliezer

2022

Applied Physics Reviews

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For photonic devices, structural disorder and light scattering have long been considered annoying and detrimental features that were best avoided or minimized. This review shows that disorder and complexity can be harnessed for photonic device applications. Compared to ordered systems, disordered systems provide much more possibilities and diverse optical responses. They have been used to create physical unclonable functions for secret key generation, and more recently for random projection, high-dimensional matrix multiplication, and reservoir computing. Incorporating structural disorder enables novel devices with unique functionalities as well as multi-functionality. A random system can function as an optical lens, a spectrometer, a polarimeter, and a radio frequency receiver. It is also employed for optical pulse measurement and full-field recovery. Multi-functional disordered photonic devices have been developed for hyperspectral imaging, spatial, and spectral polarimetry. In addition to passive devices, structural disorder has been incorporated to active devices. One prominent example is the random laser, which enables speckle-free imaging, super-resolution spectroscopy, broad tunability of high-power fiber laser, and suppression of lasing instabilities. Disordered devices have low fabrication costs, and their combination with advanced computational techniques may lead to a paradigm shift in photonics and optical engineering.

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Optical memory effect in square multimode fibers

Cited by 8 publications

References 17 publications

Imaging through a square multimode fiber by scanning focused spots with the memory effect

Imaging through a square multimode fiber by scanning focused spots with the memory effect

Controlling light propagation in multimode fibers for imaging, spectroscopy, and beyond

Harnessing disorder for photonic device applications

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