circular polarization


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Related to circular polarization: Elliptical polarization

circular polarization

See polarization.

Circular Polarization

 

the state of a propagating electromagnetic wave (such as a light wave) in which the end points of its electric and magnetic vectors E and H describe a circle in a plane perpendicular to the direction of propagation at every point in space occupied by the wave.

circular polarization

[′sər·kyə·lər ‚pō·lə·rə′zā·shən]
(physics)
Attribute of a transverse wave (either of electromagnetic radiation, or in an elastic medium) whose electric or displacement vector is of constant amplitude and, at a fixed point in space, rotates in a plane perpendicular to the propagation direction with constant angular velocity.

polarized 3D

A stereoscopic 3D display technology that separates the stereo frames by polarization. Using polarizer overlays, the movie projector or TV screen emits the left frame in a different polarization than the right frame, and the viewer wears polarized glasses to filter the frames to the appropriate eyes.

Polarized 3D is also called "passive 3D," because the glasses have no built-in electronics and do not perform any processing (contrast with active 3D). See 3D visualization, anaglyph 3D, lenticular 3D, parallax 3D and 3D glasses.

Linear and Circular Polarization
Dating back to the 1950s, the linear polarized method was the first 3D technology used for major motion pictures such as the 1953 horror film "House of Wax." The theater projector emitted stereo frames polarized 90 degrees apart. Later on, the technology changed to a clockwise/counterclockwise orientation like the RealD method widely used today. Polarized 3D glasses with two different lens polarizations filter the images to each eye respectively.

The circular polarized method migrated to TVs that alternate the lines of resolution: one line polarized to the left eye, the next line to the right. However, because the lines are interlaced, the viewer sees half the resolution (only 540 lines reach each eye on a 1080p TV). With 2160p 3D TVs, the full 1080p resolution can be delivered (see 4K TV).


Polarized 3D for the Cinema
The 3D movie projectors send polarized images to the screen, which reflect back to the viewer's polarized glasses. The circular method is used in today's 3D movies. (Images courtesy of Actif Polarizers Ltd.)







Polarized 3D for Computers and TVs
Linear polarization is adequate for video games, because gamers look straight at the screen. However, people move around more watching TV, and the circular polarization works best.


Polarized 3D for Computers and TVs
Linear polarization is adequate for video games, because gamers look straight at the screen. However, people move around more watching TV, and the circular polarization works best.







Polarized RealD Glasses
The RealD glasses (top) are handed out in the movie theater, while the steampunk goggles also have RealD lenses for the retro lover (see RealD glasses and steampunk). (Images courtesy of RealD and WillRockwell, www.etsy.com/shop/WillRockwell)


Polarized RealD Glasses
The RealD glasses (top) are handed out in the movie theater, while the steampunk goggles also have RealD lenses for the retro lover (see RealD glasses and steampunk). (Images courtesy of RealD and WillRockwell, www.etsy.com/shop/WillRockwell)
References in periodicals archive ?
Also a change in the direction of circular polarization towards the bore sight has been achieved by applying the proposed FSS.
The phase difference between these linear components leading to circular polarization is [pi]/2 radians.
Techniques for producing circular polarization utilizing a single-feed rectangular DRA are described.
A more subtle possibility is that the speed of light might be very slightly different for left- and right-handed circular polarizations (as it were, neutrino-like and antineutrino-like).
From the previous results, we can conclude that the optimized metasurface designed with resonator ellipticity [tau] = 2.33, and orientation [phi] = 25[degrees], and with slots of ellipticity [[tau].sub.s] = 2 showed high circular dichroism over the wide frequency range 16.82-18.76 GHz (10.9%) with a peak of [DELTA] = 0.91 at 17.24 GHz and a large ellipticity close to -45[degrees] ([eta] = -44.6[degrees]), which offers to the proposed microwave device the possibility to transmit circularly polarized waves and thus the capability to work as a circular polarization filter and/or circular polarizer.
To demonstrate this point, as an example, we designed a linear to circular polarization converter using only multiple planar electric metasurfaces, which can completely convert the linearly polarized incident waves to the circularly polarized transmitted waves with no energy reflection.
Awadalla, "A single-feed cylindrical superquadric dielectric resonator antenna for circular polarization," Progress In Electromagnetics Research, Vol.
The stair-shaped edge of the slot could optimize the circular polarization characteristics (Table 2).
In principle, pure circular polarization is achieved when the generated electric field has two orthogonal modes with equal amplitude and 90 degree phase difference between them.
One way to do this is to use the large circular polarization of the gamma from n-D capture and analyze the circular polarization of the gamma in a gamma polarimeter.
Most systems use either linear or circular polarization. For a simple description of these two types of wave polarization, consider the illustration shown in Figure 1.
The streams of water can have a different effect on the two circular polarization components, thereby damaging the usefulness of circular polarization for rejection of rain echoes.