News tagged with polarization
Related topics: light
Polarization (also polarisation) is a property of waves that describes the orientation of their oscillations. This article primarily covers the polarization of electromagnetic waves such as light, although other types of wave also exhibit polarization.
By convention, the polarization of light is described by specifying the direction of the wave's electric field. When light travels in free space, in most cases it propagates as a transverse wave—the polarization is perpendicular to the wave's direction of travel. In this case, the electric field may be oriented in a single direction (linear polarization), or it may rotate as the wave travels (circular or elliptical polarization). In the latter cases, the oscillations can rotate rightward or leftward in the direction of travel, and which of those two rotations is present in a wave is called the wave's chirality or handedness. In general the polarization of an electromagnetic (EM) wave is a complex issue. For instance in a waveguide such as an optical fiber, or for radially polarized beams in free space, the description of the wave's polarization is more complicated, as the fields can have longitudinal as well as transverse components. Such EM waves are either TM or hybrid modes.
For longitudinal waves such as sound waves in fluids, the direction of oscillation is by definition along the direction of travel, so there is no polarization. In a solid medium, however, sound waves can be transverse. In this case, the polarization is associated with the direction of the shear stress in the plane perpendicular to the propagation direction. This is important in seismology.
Polarization is significant in areas of science and technology dealing with wave propagation, such as optics, seismology, telecommunications and radar science. The polarization of light can be measured with a polarimeter.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
Researchers from Kyoto University have reported that basophils play a central role in Th2 induction.
Medical research May 07, 2013 | not rated yet | 0
(Medical Xpress)—The blood-brain barrier (BBB) prevents most large or hydrophilic (polar) molecules from getting into the brain. For many neurological diseases, like Parkinson's, the presence of the BBB ...
Medical research Apr 30, 2013 | 5 / 5 (2) | 0 |
University of Cincinnati (UC) researchers have found that lightning may affect the onset of headache and migraines.
Diseases, Conditions, Syndromes Jan 24, 2013 | 4 / 5 (1) | 1 |
One of the marvels of brain development is the mass migration of nerve cells to their functional position. European research has investigated the molecules required for their successful navigation.
Neuroscience Jul 16, 2012 | not rated yet | 0
On the centenary of Scott's ill-fated Terra Nova expedition to the South Pole, a study to be presented at the Society for Experimental Biology meeting on Sunday July 1 has shown that Scott's men starved to death because they ...
Other Jun 28, 2012 | 5 / 5 (1) | 1
By simply shining a tiny light within the small intestine, close to that organ's junction with the pancreas, physicians at Mayo Clinic's campus in Florida have been able to detect pancreatic cancer 100 percent of the time ...
Cancer May 21, 2012 | not rated yet | 0
The same filtered light that enables sunglasses to reduce glare may improve a physician's ability to detect early signs of cervical cancer, reducing unnecessary biopsies and surgery.
Other Nov 29, 2011 | not rated yet | 0 |