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Related Concept Videos

Angular Momentum01:21

Angular Momentum

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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...
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Angular Momentum: Single Particle01:10

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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...
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Angular Momentum: Rigid Body01:11

Angular Momentum: Rigid Body

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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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Angular Momentum about an Arbitrary Axis01:11

Angular Momentum about an Arbitrary Axis

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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...
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Conservation of Angular Momentum01:09

Conservation of Angular Momentum

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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...
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Angular Momentum and Principle Axes of Inertia01:09

Angular Momentum and Principle Axes of Inertia

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The concept of angular momentum for a solid structure is illustrated as the cumulative result of the cross-product of the position vector of the mass element and the cross-product of the body's angular velocity with the position vector.
To put this equation into simpler terms, it can be reconfigured using rectangular coordinates. This involves choosing an alternative set of XYZ axes that are arbitrarily inclined with respect to the reference frame. The process of deriving the rectangular...
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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
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Optical angular momentum and atoms.

Sonja Franke-Arnold1

  • 1SUPA and School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, UK sonja.franke-arnold@glasgow.ac.uk.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|January 11, 2017
PubMed
Summary
This summary is machine-generated.

When light with orbital angular momentum (OAM) interacts with atoms, their quantized angular momentum is affected. This interaction advances understanding of light-matter physics and enables new OAM-based quantum technologies.

Keywords:
atom opticsexperimental atom opticslight–matter interactionorbital angular momentum of lightquantum opticsstructured light

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Area of Science:

  • Quantum Optics
  • Atomic Physics
  • Light-Matter Interactions

Background:

  • Coherent light-atom interactions must conserve energy, linear momentum, and angular momentum.
  • Atomic angular momentum is quantized, including electron spin and orbital angular momentum (OAM), and mechanical rotation for cold atoms.

Approach:

  • Investigating how light carrying OAM influences an atom's quantized angular momentum.
  • Utilizing atoms as a system to probe and access the quantum properties of light's OAM.

Key Points:

  • Explores the fundamental question of how light's OAM affects atomic angular momentum.
  • Highlights the quantized nature of atomic angular momentum, encompassing spin, OAM, and rotational components.
  • Demonstrates atoms' utility in studying quantum OAM properties of light.

Conclusions:

  • Understanding these interactions is crucial for fundamental light-matter physics.
  • Enables the development of novel applications leveraging OAM, such as quantum memories, frequency converters, and sensors.