Light Rotate On Spiral Orbit

Title

Light Rotate On Spiral Orbit

Artist

Pixel Artist

Medium

Digital Art - Digital Painting

Description

The angular momentum of light is a vector quantity that expresses the amount of dynamical rotation present in the electromagnetic field of the light. While traveling approximately in a straight line, a beam of light can also be rotating (or “spinning”, or “twisting”) around its own axis. This rotation, while not visible to the naked eye, can be revealed by the interaction of the light beam with matter.Light beam can carry angular as well as linear momentum.
here are two distinct forms of rotation of a light beam, one involving its polarization and the other its wavefront shape. These two forms of rotation are therefore associated with two distinct forms of angular momentum, respectively named light spin angular momentum (SAM) and light orbital angular momentum (OAM).
In quantum terms, the beam consists of photons, each one imbued with the properties of the beam as a whole. “Synchronized clocks” corresponds to photons with one unit of intrinsic spin, positive or negative according to the sense of the rotation. In the “clocks out-of-phase” case, the photons also possess so-called orbital angular momentum. A single photon can in principle carry any whole-number amount of this rotation, from minus to plus infinity.
Orbital angular momentum is hard to visualize, but it interacts with matter differently than spin does. If a particle sitting off-axis in a light beam absorbs a photon with orbital angular momentum, it responds by circulating around the beam, not by spinning on its axis.
Reverses the spin of photons while transferring the change of angular momentum into the orbital kind. For example, a photon entering with plus one unit of spin and no orbital momentum will leave with minus one unit of spin and two units of orbital angular momentum, keeping the total constant. Similar arithmetic holds true for any incoming combination of spin and orbital angular momentum.
The design of the converter begins with a standard optical device known as a half-wave plate, made of a material in which light moves at different speeds depending on the direction of its electric field relative to the crystal lattice. Ordinarily, a half-wave plate converts right-handed (“clockwise”) circularly polarized light into left-handed, and vice versa, equivalent to changing the sign of the photon spin.
Reverses the spin of photons while transferring the change of angular momentum into the orbital kind. For example, a photon entering with plus one unit of spin and no orbital momentum will leave with minus one unit of spin and two units of orbital angular momentum, keeping the total constant. Similar arithmetic holds true for any incoming combination of spin and orbital angular momentum.
Orbital angular momentum allows light to carry more bits of information per photon than spin alone, so the ability to manipulate the orbital component could open up new communication methods. Controlling the interaction of spin and orbital angular momentum in the same photon might make possible novel kinds of logic operations in future optical or even quantum computers.

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February 15th, 2018

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