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Related Concept Videos

Angular Momentum01:21

Angular Momentum

Angular momentum characterizes an object's rotational motion and is defined as the moment of its linear momentum about a specified point O. When a particle moves along a curved path in the x-y plane, the scalar formulation calculates the magnitude of its angular momentum, utilizing the moment arm (d), representing the perpendicular distance from point O to the line of action of the linear momentum. Despite being scalar in formulation, angular momentum is inherently a vector quantity. Its...
Angular Momentum: Single Particle01:10

Angular Momentum: Single Particle

Angular momentum is directed perpendicular to the plane of the rotation, and its magnitude depends on the choice of the origin. The perpendicular vector joining the linear momentum vector of an object to the origin is called the “lever arm.” If the lever arm and linear momentum are collinear, then the magnitude of the angular momentum is zero. Therefore, in this case, the object rotates about the origin such that it lies on the rim of the circumference defined by the lever arm magnitude.
The...
Conservation of Angular Momentum: Application01:18

Conservation of Angular Momentum: Application

A system's total angular momentum remains constant if the net external torque acting on the system is zero. Examples of such systems include a freely spinning bicycle tire that slows over time due to torque arising from friction, or the slowing of Earth's rotation over millions of years due to frictional forces exerted on tidal deformations. However in the absence of a net external torque, the angular momentum remains conserved. The conservation of angular momentum principle requires a change...
Conservation of Angular Momentum01:09

Conservation of Angular Momentum

A system's total angular momentum remains constant if the net external torque acting on the system is zero. Considering a system that consists of n tiny particles, the angular momentum of any tiny particle may change, but the system's total angular momentum would remain constant. The principle of conservation of angular momentum only considers the net external torque acting on the system. While there are internal forces exerted by different particles within the system that also produce internal...
Angular Momentum about an Arbitrary Axis01:11

Angular Momentum about an Arbitrary Axis

Imagine a rigid body with a mass denoted as 'm', which has its center of mass at point G and is rotating around an inertial reference frame. The angular momentum at an arbitrary point P can be calculated by taking the cross product of the position vector and linear momentum vector for each individual mass element.
The velocity of a mass element comprises its translational velocity and the relative velocity instigated by the body's rotation. Substituting the velocity equation into the angular...
Angular Momentum: Rigid Body01:11

Angular Momentum: Rigid Body

The total angular momentum of a rigid body can be calculated using the summation of the angular momentum of all the tiny particles rotating in the same plane. Considering all the tiny particles rotating in the x-y plane, the direction of angular momentum of all such particles and that of the rigid body would be perpendicular to the plane of the rotation along the z-axis.
This calculation can get complicated when tiny particles within the rigid body are not rotating in the same plane but have...

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Related Experiment Video

Updated: May 7, 2026

Construction and Operation of a Light-driven Gold Nanorod Rotary Motor System
09:48

Construction and Operation of a Light-driven Gold Nanorod Rotary Motor System

Published on: June 30, 2018

Optical angular momentum conversion in a nanoslit: comment.

Etienne Brasselet

    Optics Letters
    |October 2, 2013
    PubMed
    Summary
    This summary is machine-generated.

    This study corrects previous findings, demonstrating that slit dichroism significantly impacts spin-to-orbital optical angular momentum conversion. This dichroism is crucial for efficient optical vortex generation.

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    Direct Imaging of Laser-driven Ultrafast Molecular Rotation

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    Related Experiment Videos

    Last Updated: May 7, 2026

    Construction and Operation of a Light-driven Gold Nanorod Rotary Motor System
    09:48

    Construction and Operation of a Light-driven Gold Nanorod Rotary Motor System

    Published on: June 30, 2018

    Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
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    Direct Imaging of Laser-driven Ultrafast Molecular Rotation
    10:52

    Direct Imaging of Laser-driven Ultrafast Molecular Rotation

    Published on: February 4, 2017

    Area of Science:

    • Optics and Photonics
    • Nanophotonics
    • Light-Matter Interactions

    Background:

    • Previous research reported spin-to-orbital optical angular momentum conversion from subwavelength circular slits.
    • The prior study claimed conversion efficiency was independent of slit dichroism.

    Discussion:

    • This work corrects the prior assertion by demonstrating the significant influence of slit dichroism.
    • Dichroism plays a critical role in the efficiency and characteristics of optical vortex generation.

    Key Insights:

    • Slit dichroism is a key factor, not an independent variable, in spin-to-orbital angular momentum conversion.
    • Accurate modeling of optical vortex generation must account for material and geometric anisotropy.

    Outlook:

    • Further investigation into anisotropic nanostructures for controlled optical vortex generation.
    • Exploring applications in optical trapping, microscopy, and quantum information processing.