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Related Concept Videos

X-ray Crystallography02:18

X-ray Crystallography

The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are  scattered by the electron clouds around the sample atoms. The  X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal crystal...
Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
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...
Determination of Crystal Structures01:29

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...

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Related Experiment Video

Updated: May 25, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
10:39

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Published on: October 11, 2016

Periodic diffraction correlation imaging without a beam-splitter.

Hu Li1, Zhipeng Chen, Jin Xiong

  • 1State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. lihuuhil@163.com

Optics Express
|February 15, 2012
PubMed
Summary
This summary is machine-generated.

Researchers developed a new correlation imaging method using periodic diffraction. This technique enables super-resolution and Nth-order ghost imaging without a beam splitter.

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Area of Science:

  • Optics and Photonics
  • Image Processing
  • Quantum Imaging

Background:

  • Traditional correlation imaging often relies on beam splitters, which can limit system stability and complexity.
  • Achieving super-resolution and higher-order ghost imaging presents significant challenges in optical system design.

Purpose of the Study:

  • To propose and demonstrate a novel correlation imaging mechanism.
  • To achieve super-resolution imaging and Nth-order ghost imaging.
  • To eliminate the need for a beam splitter in correlation imaging setups.

Main Methods:

  • Utilizing a periodic diffraction effect.
  • Generating a periodic intensity pattern from a periodic point source array.
  • Implementing a beam-splitter-free correlation imaging system.

Main Results:

  • Demonstration of a new correlation imaging mechanism based on periodic diffraction.
  • Successful implementation of super-resolution imaging.
  • Achievement of Nth-order ghost imaging without a beam splitter.
  • Development of a novel correlation microscopy technique.

Conclusions:

  • The proposed periodic diffraction-based correlation imaging mechanism offers a new pathway for advanced imaging techniques.
  • This method provides a simplified and potentially more stable approach to super-resolution and ghost imaging.
  • The technique opens possibilities for novel applications in correlation microscopy and other optical imaging fields.