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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.
The de Broglie Wavelength02:32

The de Broglie Wavelength

In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
Propagation of Waves01:07

Propagation of Waves

When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession, and the angular frequency...
Reflection of Waves01:07

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When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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Related Experiment Video

Updated: Jul 8, 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

High-order Talbot fringes for atomic matter waves.

S Nowak, C Kurtsiefer, T Pfau

    Optics Letters
    |January 12, 2008
    PubMed
    Summary

    We observed de Broglie wave interference in near-field diffraction from a microfabricated grating. This study spatially resolved self-imaging effects and their dependence on de Broglie wavelength using time-of-flight.

    Area of Science:

    • Quantum mechanics
    • Wave-particle duality
    • Optics and photonics

    Background:

    • De Broglie waves describe the wave-like nature of particles.
    • Near-field diffraction occurs when the observation distance is comparable to the wavelength.
    • Microfabricated gratings offer precise control over wave interactions.

    Purpose of the Study:

    • To observe and analyze the interference of de Broglie waves.
    • To spatially resolve self-imaging phenomena in near-field diffraction.
    • To investigate the relationship between de Broglie wavelength and grating period reduction.

    Main Methods:

    • Utilizing a microfabricated grating for diffraction experiments.
    • Employing a time-to-flight technique to measure de Broglie wavelengths.

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    Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry
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  • Spatially resolving the diffraction near field to observe self-imaging effects.

    • Main Results:

    • Successfully observed de Broglie wave interference patterns.
    • Quantified the reduction of the grating period through self-imaging (orders 2-7).
    • Demonstrated a dependence of self-imaging on the de Broglie wavelength.

    Conclusions:

    • The interference of de Broglie waves is observable in near-field diffraction.
    • Self-imaging effects in gratings are influenced by the particle's de Broglie wavelength.
    • Time-of-flight measurements are effective for studying wave-particle duality phenomena.