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Related Concept Videos

Electric Field of a Non Uniformly Charged Sphere01:22

Electric Field of a Non Uniformly Charged Sphere

Gauss's law states that the electric flux through any closed surface equals the net charge enclosed within the surface. This law is beneficial for determining the expressions for the electric field for a particular charge distribution if the electric flux is known.
Consider a non-uniformly charged sphere, for which the density of charge depends only on the distance from a point in space and not on the direction. Such a sphere has a spherically symmetrical charge distribution. Here, the electric...
Electronic Structure of Atoms02:28

Electronic Structure of Atoms


An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum numbers:  n, l, ml, and...
The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra. Schrödinger...
The Principle of Superposition and the Gravitational Field01:17

The Principle of Superposition and the Gravitational Field

The principle of superposition applies to gravitational forces of objects that are sufficiently far apart. It states that the net gravitational force on a point object is the vector sum of the gravitational forces on it due to various objects. The principle helps calculate the force by listing the individual forces and then vectorially summing them up. However, it should be noted that the principle of superposition is not always apparent. In the presence of a second force, the first force could...
Gauss's Law: Problem-Solving01:10

Gauss's Law: Problem-Solving

Gauss's law helps determine electric fields even though the law is not directly about electric fields but electric flux. In situations with certain symmetries (spherical, cylindrical, or planar) in the charge distribution, the electric field can be deduced based on the knowledge of the electric flux. In these systems, we can find a Gaussian surface S over which the electric field has a constant magnitude. Furthermore, suppose the electric field is parallel (or antiparallel) to the area vector...
Electric Field of a Charged Disk01:23

Electric Field of a Charged Disk

The simplest case of a surface charge distribution is the uniformly charged disk. Calculating its electric field also helps us calculate the electric field of a large plane of charge.
The system's symmetry is in the cylindrical directions across the plane of the charge. As a result, the electric fields created by various surface charge elements nullify each other in the direction parallel to the surface. Thereby, the resulting electric field is perpendicular to the plane. Since the disk is...

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Related Experiment Video

Updated: Jun 19, 2026

Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
08:44

Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene

Published on: August 22, 2017

Quantized atom-field force at the surface of a microsphere.

F Treussart, J Hare, L Collot

    Optics Letters
    |October 27, 2009
    PubMed
    Summary

    We show that the atom

    Area of Science:

    • Atomic physics
    • Quantum optics
    • Nanophotonics

    Background:

    • The dipole force on atoms in light fields is typically treated classically.
    • Photon quantization is fundamental but often experimentally inaccessible in atom-light interactions.
    • Microsphere whispering gallery modes offer strong light-matter interaction in small volumes.

    Purpose of the Study:

    • To propose a method for detecting the quantum nature of the dipole force.
    • To investigate the quantization of atomic dipole forces due to photon discreteness.
    • To explore the use of evanescent fields from microsphere resonators for atom manipulation.

    Main Methods:

    • Simulating the scattering of slow atoms interacting with the evanescent field of a microsphere.
    • Analyzing atomic deflection patterns resulting from the quantized dipole force.

    More Related Videos

    Finite Element Modelling of a Cellular Electric Microenvironment
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    Finite Element Modelling of a Cellular Electric Microenvironment

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    Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy
    13:15

    Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy

    Published on: July 18, 2014

    Related Experiment Videos

    Last Updated: Jun 19, 2026

    Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
    08:44

    Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene

    Published on: August 22, 2017

    Finite Element Modelling of a Cellular Electric Microenvironment
    08:23

    Finite Element Modelling of a Cellular Electric Microenvironment

    Published on: May 18, 2021

    Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy
    13:15

    Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy

    Published on: July 18, 2014

  • Developing a theoretical framework for an inverse Stern-Gerlach experiment using light fields.

    • Main Results:

    • The atomic deflection is shown to be directly correlated with the quantum state of the light field.
    • The discrete nature of photons leads to observable quantization effects in atomic scattering.
    • The proposed method provides a unique signature of photon-induced atomic forces.

    Conclusions:

    • The quantum nature of the dipole force can be experimentally detected through atomic scattering.
    • Evanescent fields of microsphere resonators are suitable for observing photon quantization effects on atoms.
    • This work opens new avenues for quantum measurement and control of atomic systems.