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Related Concept Videos

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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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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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Orbital angular momentum microlaser.

Pei Miao1, Zhifeng Zhang1, Jingbo Sun1

  • 1Department of Electrical Engineering, The State University of New York at Buffalo, Buffalo, NY 14260, USA.

Science (New York, N.Y.)
|July 30, 2016
PubMed
Summary
This summary is machine-generated.

Researchers created a micro-ring laser that generates orbital angular momentum (OAM) vortex lasing. This breakthrough in non-Hermitian photonics precisely controls OAM topological charge and polarization for advanced optical communications.

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Area of Science:

  • Optics and Photonics
  • Non-Hermitian Physics
  • Microscale Lasers

Background:

  • Structured light, including orbital angular momentum (OAM), offers advanced capabilities in optics.
  • Generating OAM lasing at the micro- and nanoscale is crucial for increasing information capacity.
  • Non-Hermitian photonics and exceptional points offer new design paradigms for optical devices.

Purpose of the Study:

  • To demonstrate a micro-ring laser capable of generating single-mode OAM vortex lasing.
  • To precisely control the topological charge of the OAM mode.
  • To enable on-demand manipulation of polarization for radially polarized vortex emission.

Main Methods:

  • Exploitation of non-Hermitian photonics design principles at an exceptional point.
  • Development of a microring laser structure for OAM generation.
  • Integration of polarization control mechanisms within the microlaser.

Main Results:

  • Successful demonstration of a microring laser producing single-mode OAM vortex lasing.
  • Precise control over the topological charge of the generated OAM modes.
  • Achieved on-demand manipulation of polarization, resulting in radially polarized vortex emission.

Conclusions:

  • The developed OAM microlaser effectively generates and controls OAM vortex beams.
  • This technology leverages non-Hermitian photonics for advanced optical functionalities.
  • Potential applications include next-generation integrated optoelectronic devices for quantum and classical optical communications.