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Related Concept Videos

Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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...
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...
Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
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...
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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Measuring Diffusion Coefficients via Two-photon Fluorescence Recovery After Photobleaching
07:00

Measuring Diffusion Coefficients via Two-photon Fluorescence Recovery After Photobleaching

Published on: February 26, 2010

Diffraction efficiency of bleached, photographically recorded interference patterns.

J Upatnieks, C Leonard

    Applied Optics
    |January 15, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Researchers enhanced holographic diffraction efficiency by converting silver images to dielectric images using chemical bleaching. This technique achieved a maximum 60% efficiency, with applications in holography and zone plates.

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    Area of Science:

    • Optics
    • Materials Science
    • Physical Chemistry

    Background:

    • Three-dimensional interference patterns are crucial for applications like holography.
    • Photographically recorded interference patterns often suffer from limited diffraction efficiency.
    • Existing methods for enhancing efficiency require further optimization.

    Purpose of the Study:

    • To investigate techniques for increasing the diffraction efficiency of recorded 3D interference patterns.
    • To explore the use of chemical bleaching processes for image conversion.
    • To demonstrate practical applications of the enhanced patterns.

    Main Methods:

    • Experimental investigation of various chemical bleaching processes.
    • Conversion of silver-based photographic images to dielectric images.
    • Measurement of diffraction efficiency and its relationship with transmittance.
    • Analysis of chemical formulas and bleaching procedures.

    Main Results:

    • Successful conversion of silver images to dielectric images using specific bleaches.
    • Development of diffraction efficiency versus transmittance curves.
    • Achieved a maximum diffraction efficiency of 60%.
    • Demonstrated applicability to holography and partitioned zone plates.

    Conclusions:

    • Chemical bleaching offers a viable method to significantly enhance diffraction efficiency.
    • The dielectric image conversion is effective for improving the performance of recorded interference patterns.
    • The developed techniques show promise for advanced holographic and optical element applications.