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Ptycho-endoscopy on a lensless ultrathin fiber bundle tip

Light(Science & Applications) 2024年第9期13卷 1766-1778页

作者： Pengming Song Ruihai Wang Lars Loetgering Jia Liu Peter Vouras Yujin Lee Shaowei Jiang Bin Feng Andrew Maiden changhuei yang Guoan Zheng Department of Biomedical Engineering University of ConnecticutStorrsCT 06269USA CarlZeiss AG Carl Zeiss PromenadeJenaThuringia 07745Germany United States Department of Defense WashingtonDC 20301USA School of Electrical and Electronic Engineering Yonsei UniversitySeoul 03722Republic of Korea Department of Electronic and Electrical Engineering University of SheffieldSheffield South Yorkshire S13JDUK Diamond Light Source HarwellOxfordshire OX110DEUK Department of Electrical Engineering California Institute of TechnologyPasadenaCA 91125USA Center for Biomedical and Bioengineering Innovation University of ConnecticutStorrsCT 06269USA

Synthetic aperture radar(SAR)utilizes an aircraft-carried antenna to emit electromagnetic pulses and detect the returning *** the aircraft travels across a designated area,it synthesizes a large virtual aperture to improve image *** by SAR,we introduce synthetic aperture ptycho-endoscopy(SAPE)for micro-endoscopic imaging beyond the diffraction *** operates by hand-holding a lensless fiber bundle tip to record coherent diffraction patterns from *** fiber cores at the distal tip modulate the diffracted wavefield within a confined area,emulating the role of the‘airborne antenna’in *** handheld operation introduces positional shifts to the tip,analogous to the aircraft’s *** shifts facilitate the acquisition of a ptychogram and synthesize a large virtual aperture extending beyond the bundle’s physical *** mitigate the influences of hand motion and fiber bending through a low-rank spatiotemporal decomposition of the bundle’s modulation *** tests demonstrate the ability to resolve a 548-nm linewidth on a resolution *** achieved space-bandwidth product is~1.1 million effective pixels,representing a 36-fold increase compared to that of the original fiber ***,SAPE’s refocusing capability enables imaging over an extended depth of field exceeding 2 *** aperture synthesizing process in SAPE surpasses the diffraction limit set by the probe’s maximum collection angle,opening new opportunities for both fiber-based and distal-chip endoscopy in applications such as medical diagnostics and industrial inspection.

关键词： fiber antenna bundle

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Non-iterative complex wave-field reconstructionbased on Kramers–Kronig relations

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Photonics Research 2021年第6期9卷 1003-1012页

作者： CHENG SHEN MINGSHU LIANG AN PAN changhuei yang Department of Electrical Engineering California Institute of TechnologyPasadenaCalifornia 91125USA Xi’an Institute of Optics and Precision Mechanics(XIOPM) Chinese Academy of Sciences(CAS)Xi’an 710119China

A non-iterative and non-interferometric computational imaging method to reconstruct a complex wave field called synthetic aperture imaging based on Kramers–Kronig relations(KKSAI)is *** collecting images through a modified microscope system with pupil modulation capability,we show that the phase and amplitude profile of the sample at pupil limited resolution can be extracted from as few as two intensity images by using Kramers–Kronig(KK)*** is established that as long as each subaperture’s edge crosses the pupil center,the collected raw images are mathematically analogous to off-axis *** in turn allows us to adapt a recently reported KK-relations-based phase recovery framework in off-axis holography for use in *** is non-iterative,free of parameter tuning,and applicable to a wider range of *** and experiment results have proved that it has much lower computational burden and achieves the best reconstruction quality when compared with two existing phase imaging methods.

关键词： iterative wave field

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