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Related Concept Videos

Continuous -time Fourier Transform01:11

Continuous -time Fourier Transform

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The Fourier series is instrumental in representing periodic functions, offering a powerful method to decompose such functions into a sum of sinusoids. This technique, however, necessitates modification when applied to nonperiodic functions. Consider a pulse-train waveform consisting of a series of rectangular pulses. When these pulses have a finite period, they can be accurately represented by a Fourier series. Yet, as the period approaches infinity, resulting in a single, isolated pulse, the...
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In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Updated: Dec 26, 2025

Non-invasive 3D-Visualization with Sub-micron Resolution Using Synchrotron-X-ray-tomography
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Multi-layered full-field phase imaging using continuous-wave terahertz ptychography.

Dayong Wang, Bing Li, Lu Rong

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    |March 13, 2020
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    Summary
    This summary is machine-generated.

    We developed a new terahertz (THz) imaging method using a 3D ptychographic algorithm to reconstruct multi-layered samples. This technique successfully images stacked thin plates without layer crosstalk, enabling 3D THz imaging.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Imaging Technology

    Background:

    • Terahertz (THz) waves offer unique properties for imaging dielectric materials.
    • THz phase imaging is crucial for analyzing absorption and phase modulation in thin and stacked samples.
    • Existing methods face challenges with crosstalk in multi-layered imaging.

    Purpose of the Study:

    • To apply a 3D ptychographic iterative engine algorithm for continuous-wave THz full-field multi-layered phase imaging.
    • To reconstruct the complex-valued transmission function of multi-layered samples and the probe function.
    • To overcome crosstalk issues between different layers in THz imaging.

    Main Methods:

    • Utilized a three-dimensional ptychographic iterative engine algorithm.
    • Applied continuous-wave terahertz (THz) full-field imaging.
    • Reconstructed complex-valued transmission functions for a two-layered polypropylene sample.

    Main Results:

    • Successfully reconstructed the transmission function of each layer in a two-layered sample, eliminating crosstalk.
    • Observed field-of-view enlargement at the second object layer.
    • Demonstrated a lensless, compact imaging approach.

    Conclusions:

    • The 3D ptychographic iterative engine algorithm enables effective multi-layered THz phase imaging.
    • The method provides layer-specific reconstructions immune to crosstalk.
    • This lensless technique shows potential for advanced 3D terahertz imaging applications.