Imaging through scattering media using digital holography

Vinu, R. V.; K, Kim; Somkuwar, Atul S.; Park, YongKeun; Singh, Rakesh Kumar

doi:10.1016/j.optcom.2019.01.080

Cited by 24 publications

(2 citation statements)

References 30 publications

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“…The reconstruction of the coherent transmission properties of the scatterer can also be directly applied to reconstruct the image of an object concealed by the scattering medium. [53][54][55] A particular possibility enabled by our methodology is the possibility of performing phase-sensitive reconstruction by leveraging our ability to reconstruct the full-wave properties of the transfer matrix elements. A numerical implementation of the image reconstruction process is shown in Fig.…”

Section: -Time-resolved Retrieval Of Image Object Obscured By Scatter...mentioning

confidence: 99%

Deterministic spatiotemporal focusing of terahertz waves through scattering media

Kumar

Cecconi

Pasquazi

et al. 2021

2021 Conference on Lasers and Electro-Optics Europe &Amp; European Quantum Electronics Conference (CLEO/Europe-EQEC)

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Scattering-assisted synthesis of broadband optical pulses is recognized to have a cross-disciplinary fundamental and application importance. Achieving full-waveform synthesis generally requires means for assessing the instantaneous electric field, i.e. the absolute electromagnetic phase. These are generally not accessible to established methodologies for scattering-assisted pulse envelope and phase shaping. The lack of field sensitivity also results in complex indirect approaches to evaluate the scattering space-time properties. The terahertz frequency domain potentially offers some distinctive new possibilities thanks to the availability of methods to perform absolute measurements of the scattered electric field, as opposed to optical intensity-based diagnostics. An interesting conceptual question is whether this additional degree of freedom can lead to different types of methodologies towards wave shaping and to a direct field-waveform control. In this work, we theoretically investigate a deterministic scheme to achieve broadband, spatiotemporal waveform control of terahertz fields mediated by a scattering medium. The direct field access via Time-Domain Spectroscopy enables a process in which the field and scattering matrix of the medium are assessed with minimal experimental efforts. Then, the illumination conditions for an arbitrary targeted output field waveform are deterministically determined. In addition, the complete field knowledge enables reconstructing field distributions with complex phase profiles, as in the case of phase-only masks and optical vortices, a significantly challenging task for traditional implementations at optical frequencies based on intensity measurements aided with interferometric techniques.

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Section: -Time-resolved Retrieval Of Image Object Obscured By Scatter...mentioning

confidence: 99%

Deterministic spatiotemporal focusing of terahertz waves through scattering media

Kumar

Cecconi

Pasquazi

et al. 2021

2021 Conference on Lasers and Electro-Optics Europe &Amp; European Quantum Electronics Conference (CLEO/Europe-EQEC)

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“…Reports have described studies of techniques using holography to reconstruct the information of an object placed behind a diffuser or scattering medium [6][7][8][9]. Studies on techniques using digital holography to reconstruct the complex amplitude of an object placed behind a diffuser or scattering medium have been reported [4,5,[10][11][12]. In addition, holographic wavefront correction has been adopted in imaging through scattering media [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Imaging phase objects through diffusers based on lensless digital holography

Watanabe,

Asada,

Kiyosumi

et al. 2024

Opt Rev

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Imaging of phase objects behind scattering media is a challenging task. Intensity imaging through diffusers can be achieved based on digital holography by obtaining the complex amplitude of the diffuser in advance. As described in this paper, we experimentally demonstrate the reconstructed images of phase objects behind diffusers with different diffusion angles by digital holography. Using the complex amplitude information of the diffuser to correct the complex amplitude information of the object through the diffuser, the phase distribution of the object is obtainable behind the diffuser. Imaging of phase objects behind diffusers has been verified through experiments using a plano-convex lens and a wedge substrate as phase objects with various scattering angles. Quantitative analyses of the phase objects are performed. The lens shape can be visualized from the known refractive index. Moreover, the curvature radius can be estimated.

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Real‐Time Jones Matrix Synthesis by Compact Polarization Inline Holographic Microscopy

Liu,

R.V,

Chen

et al. 2024

Laser & Photonics Reviews

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The Jones matrix is a powerful quantitative tool for polarimetric imaging and characterization, where the matrix elements represent the intrinsic optical properties of the anisotropic objects on interaction with the polarized light. Most of the state‐of‐the‐art single‐shot Jones‐matrix imaging techniques rely on interferometric methods, which makes the design complex with the use of large number of polarization optics and produces space‐bandwidth limitations. The simultaneous extraction of Jones matrix elements with a compact system design is still a technical challenge in view of its potential applications in biomedical and real‐time characterization scenarios. In this paper, the imaging features of the in‐line holography are exploited to develop a compact polarization in‐line holography (PIH) system capable of single‐shot extraction of Jones‐matrix elements. The technique achieves simultaneous orthogonal polarization state generation and corresponding polarization multiplexed in‐line hologram detection by utilizing a compact polarization geometry. The imaging compatibility and measurement accuracy of the method is experimentally validated by the real‐time synthesis of Jones‐matrix elements corresponding to custom designed polarization sensitive samples and standard birefringent resolution target. Furthermore, to demonstrate the application of the system in dynamic imaging, the transient polarization changes of a custom‐designed parallel nematic liquid crystal display (LCD) are investigated.

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Imaging through scattering media using digital holography

Cited by 24 publications

References 30 publications

Deterministic spatiotemporal focusing of terahertz waves through scattering media

Deterministic spatiotemporal focusing of terahertz waves through scattering media

Imaging phase objects through diffusers based on lensless digital holography

Real‐Time Jones Matrix Synthesis by Compact Polarization Inline Holographic Microscopy

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