Publications by Year: 2020

Shekel, Noam, and Ori Katz. “Using fiber-bending-generated speckles for improved working distance and background rejection in lensless micro-endoscopy”. Opt. Lett. 45.15 (2020): , 45, 15, 4288–4291. Web. Publisher's VersionAbstract

Lensless flexible fiber-bundle-based endoscopes allow imaging at depths beyond the reach of conventional microscopes with a minimal footprint. These multicore fibers provide a simple solution for wide-field fluorescent imaging when the target is adjacent to the fiber facet. However, they suffer from a very limited working distance and out-of-focus background. Here, we carefully study the dynamic speckle illumination patterns generated by bending a commercial fiber bundle and show that they can be exploited to allow extended working distance and background rejection, using a super-resolution fluctuations imaging analysis of multiple frames, without the addition of any optical elements.

Weinberg, Gil, and Ori Katz. “100,000 frames-per-second compressive imaging with a conventional rolling-shutter camera by random point-spread-function engineering”. Opt. Express 28.21 (2020): , 28, 21, 30616–30625. Web. Publisher's VersionAbstract

We demonstrate an approach that allows taking videos at very high frame-rates of over 100,000 frames per second by exploiting the fast sampling rate of the standard rolling-shutter readout mechanism, common to most conventional sensors, and a compressive-sampling acquisition scheme. Our approach is directly applied to a conventional imaging system by the simple addition of a diffuser to the pupil plane that randomly encodes the entire field-of-view to each camera row, while maintaining diffraction-limited resolution. A short video is reconstructed from a single camera frame via a compressed-sensing reconstruction algorithm, exploiting the inherent sparsity of the imaged scene.

Doktofsky, Daniel, Moriya Rosenfeld, and Ori Katz. “Acousto optic imaging beyond the acoustic diffraction limit using speckle decorrelation”. Communications Physics 31 (2020): , 3, 1, 1-8. Web. Publisher's Version