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Related Concept Videos

Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

460
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
460
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Magnetic Damping01:17

Magnetic Damping

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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
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Group Polarization01:01

Group Polarization

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Group polarization is the strengthening of an original group attitude following the discussion of views within a group (Teger & Pruitt, 1967). That is, if a group initially favors a viewpoint, after discussion the group consensus is likely a stronger endorsement of the viewpoint. Conversely, if the group was initially opposed to a viewpoint, group discussion would likely lead to stronger opposition.
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Force On A Current Loop In A Magnetic Field01:17

Force On A Current Loop In A Magnetic Field

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Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process,...
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Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

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The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
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Related Experiment Video

Updated: Aug 26, 2025

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
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Vector beam polarization rotation control using resonant magneto optics.

Nilamoni Daloi, Tarak Nath Dey

    Optics Express
    |October 13, 2022
    PubMed
    Summary

    Researchers controlled vector beam polarization using a magnetic field in a four-level atomic system. This method enables precise polarization rotation for advanced optical applications.

    Area of Science:

    • Atomic physics
    • Quantum optics
    • Nonlinear optics

    Background:

    • Vector beams possess unique polarization properties.
    • Atomic systems offer platforms for light manipulation.
    • Controlling light polarization is crucial for optical technologies.

    Purpose of the Study:

    • Investigate vector beam propagation in a four-level tripod atomic system.
    • Explore magnetic field-induced polarization control.
    • Analyze the impact of nonlinearity and broadening on polarization rotation.

    Main Methods:

    • Utilized a four-level tripod atomic system.
    • Coupled transitions with a strong control field and a weak probe vector beam.
    • Applied an external magnetic field to induce anisotropy and control refractive indices.

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    Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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    Hyperpolarized Xenon for NMR and MRI Applications
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    Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
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    Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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    Main Results:

    • Demonstrated magnetic field-dependent refractive index anisotropy for vector beam components.
    • Showcased the ability to rotate the vector beam's transverse polarization structure.
    • Observed the influence of nonlinearity and inhomogeneous broadening on polarization rotation.

    Conclusions:

    • A novel mechanism for efficient vector beam polarization control and manipulation was established.
    • The findings suggest potential applications in high-resolution microscopy and optical communications.