Increasing the resolution of the reconstructed image in terahertz pulse time-domain holography

Balbekin, Nikolay S.; Kulya, Maksim S.; Белашов, А. В.; Gorodetsky, Andrei; Petrov, Nikolay V.

doi:10.1038/s41598-018-36642-3

Cited by 33 publications

(13 citation statements)

References 59 publications

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“…[39]. Iterative phase retrieval with extrapolation has already been successfully applied for resolution enhancement in terahertz holograms [40][41][42], where it demonstrated resolution enhancement so that features of sub-wavelength size (35 m) were resolved from a 2.52 THz hologram (118.83 m wavelength) [40]. Thus, the extrapolation can improve the resolution by a few times and even allows resolving of features that are smaller than the wavelength.…”

Section: Iterative Phase Retrieval With Extrapolationmentioning

confidence: 99%

Iterative phase retrieval for digital holography: tutorial

Latychevskaia

2019

J. Opt. Soc. Am. A

101

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This paper provides a tutorial of iterative phase retrieval algorithms based on the Gerchberg-Saxton (GS) algorithm applied in digital holography. In addition, a novel GSbased algorithm that allows reconstruction of 3D samples is demonstrated. The GS-based algorithms recover complex-valued wavefront-by-wavefront back-and forth propagation between two planes with constraints superimposed in these two planes. Iterative phase retrieval allows quantitatively correct and twin-image-free reconstructions of object amplitude and phase distributions from its in-line hologram. The present work derives the quantitative criteria on how many holograms are required to reconstruct a complex-valued object distribution, be it a 2D or 3D sample. It is shown that for a sample that can be approximated as a 2D sample, a single-shot in-line hologram is sufficient to reconstruct the absorption and phase distributions of the sample. Previously, the GS-based algorithms have been successfully employed to reconstruct samples that are limited to a 2D plane. However, realistic physical objects always have some finite thickness and therefore are 3D rather than 2D objects. This study demonstrates that 3D samples, including 3D phase objects, can be reconstructed from two or more holograms. It is shown that in principle, two holograms are sufficient to recover the entire wavefront diffracted by a 3D sample distribution. In this method, the reconstruction is performed by applying iterative phase retrieval between the planes where intensity was measured. The recovered complex-valued wavefront is then propagated back to the sample planes, thus reconstructing the 3D distribution of the sample. This method can be applied for 3D samples such as 3D distribution of particles, thick biological samples, and other 3D phase objects. Examples of reconstructions of3Dobjects, including phase objects, are provided. Resolution enhancement obtained by iterative extrapolation of holograms is also discussed.

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Section: Iterative Phase Retrieval With Extrapolationmentioning

confidence: 99%

Iterative phase retrieval for digital holography: tutorial

Latychevskaia

2019

J. Opt. Soc. Am. A

101

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“…Then, overlapped beams evolve during diffractive propagation which is investigated by a coherent electrooptic detection scheme, described in detail elsewhere. 15 Independently delayed probe beam scans the wavefront in time-domain. As a result, spatially resolved time domain THz pulse profiles are recorded through the CCD.…”

Section: Setup For Numerical Simulationmentioning

confidence: 99%

Propagation dynamics of ultrabroadband terahertz beams with orbital angular momentum for wireless data transfer

Kulya

Sokolenko

Gorodetsky

et al. 2020

Broadband Access Communication Technologies XIV

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“…18, the resolution of THz imaging can be enhanced through the reconstruction of the image in THz pulse time-domain holography. 271 Such research can be classified as a numerical approach for increasing the resolution of retrieved images of objects after their diffraction patterns are recorded via THz pulse time-domain holography.…”

Section: Digital Image Processing and Data Sciencementioning

confidence: 99%

Survey of terahertz photonics and biophotonics

et al. 2020

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We review the advances of terahertz (THz) science and technology in biophotonics, including related challenges and solutions. The main impediment to THz spectroscopy and imaging in this field is the high absorption of the THz beam in water. Hence, transmission imaging and spectroscopy of thick wet tissue using THz radiation has generally been quite difficult. However, the absorption of THz waves by water molecules is so strong that increasing the power of the THz source can lead to structural and functional changes in tissues, so solutions must go beyond a larger power output. In terms of resolution, THz imaging is superior to ultrasound but inferior to visible light microscopy. Owing to its unique material analysis capabilities, promising diagnosis applications have been demonstrated through THz imaging and spectroscopy. Unfortunately, many applications are limited by beam penetration depth and resolution. Hence, researchers from a wide variety of scientific and technical fields have been actively improving these features through the development of electronic devices and materials. In addition, groundbreaking optical architecture and materials to reduce beam absorption in the optics of a system and generate focused beams with smaller diameters have been proposed. On the software side, image processing techniques to computationally enhance the resolution and quality of THz imaging have been proposed. Data science and machine learning to automate the diagnosis of defects and diseases through processing THz images and spectroscopy data have been proposed. We have reviewed the applications of THz radiation in biophotonics and research achievements toward advancing these applications. A conclusion with a roadmap toward increasing the footprint of the THz technology in biophotonics is also proposed.

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Increasing the resolution of the reconstructed image in terahertz pulse time-domain holography

Cited by 33 publications

References 59 publications

Iterative phase retrieval for digital holography: tutorial

Iterative phase retrieval for digital holography: tutorial

Propagation dynamics of ultrabroadband terahertz beams with orbital angular momentum for wireless data transfer

Survey of terahertz photonics and biophotonics

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