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Polarization waves Wikipedia. Circular polarization on rubber thread, converted to linear polarization. Polarization alsopolarisation is a property applying to transversewaves that specifies the geometrical orientation of the oscillations. In a transverse wave, the direction of the oscillation is transverse to the direction of motion of the wave, so the oscillations can have different directions perpendicular to the wave direction. A simple example of a polarized transverse wave is vibrations traveling along a taut string see image for example, in a musical instrument like a guitar string. Depending on how the string is plucked, the vibrations can be in a vertical direction, horizontal direction, or at any angle perpendicular to the string. In contrast, in longitudinal waves, such as sound waves in a liquid or gas, the displacement of the particles in the oscillation is always in the direction of propagation, so these waves do not exhibit polarization. Transverse waves that exhibit polarization include electromagnetic waves such as light and radio waves, gravitational waves,6 and transverse sound waves shear waves in solids. In some types of transverse waves, the wave displacement is limited to a single direction, so these also do not exhibit polarization for example, in surface waves in liquids gravity waves, the wave displacement of the particles is always in a vertical plane. An electromagnetic wave such as light consists of a coupled oscillating electric field and magnetic field which are always perpendicular by convention, the polarization of electromagnetic waves refers to the direction of the electric field. In linear polarization, the fields oscillate in a single direction. In circular or elliptical polarization, the fields rotate at a constant rate in a plane as the wave travels. The rotation can have two possible directions if the fields rotate in a right hand sense with respect to the direction of wave travel, it is called right circular polarization, or, if the fields rotate in a left hand sense, it is called left circular polarization. Light or other electromagnetic radiation from many sources, such as the sun, flames, and incandescent lamps, consists of short wave trains with an equal mixture of polarizations this is called unpolarized light. Polarized light can be produced by passing unpolarized light through a polarizing filter, which allows waves of only one polarization to pass through. Best Nigerian Tv Shows more. The most common optical materials such as glass are isotropic and do not affect the polarization of light passing through them however, some materialsthose that exhibit birefringence, dichroism, or optical activitycan change the polarization of light. Some of these are used to make polarizing filters. Light is also partially polarized when it reflects from a surface. According to quantum mechanics, electromagnetic waves can also be viewed as streams of particles called photons. When viewed in this way, the polarization of an electromagnetic wave is determined by a quantum mechanical property of photons called their spin. A photon has one of two possible spins it can either spin in a right hand sense or a left hand sense about its direction of travel. Circularly polarized electromagnetic waves are composed of photons with only one type of spin, either right or left hand. Linearly polarized waves consist of equal numbers of right and left hand spinning photons, with their phase synchronized so they superpose to give oscillation in a plane. Polarization is an important parameter in areas of science dealing with transverse waves, such as optics, seismology, radio, and microwaves. Especially impacted are technologies such as lasers, wireless and optical fiber telecommunications, and radar. IntroductioneditWave propagation and polarizationeditMost sources of light are classified as incoherent and unpolarized or only partially polarized because they consist of a random mixture of waves having different spatial characteristics, frequencies wavelengths, phases, and polarization states. However, for understanding electromagnetic waves and polarization in particular, it is easiest to just consider coherent plane waves these are sinusoidal waves of one particular direction or wavevector, frequency, phase, and polarization state. Characterizing an optical system in relation to a plane wave with those given parameters can then be used to predict its response to a more general case, since a wave with any specified spatial structure can be decomposed into a combination of plane waves its so called angular spectrum. And incoherent states can be modeled stochastically as a weighted combination of such uncorrelated waves with some distribution of frequencies its spectrum, phases, and polarizations. Transverse electromagnetic wavesedit. A vertically polarized electromagnetic wave of wavelength has its electric field vector E red oscillating in the vertical direction. The magnetic field B or H is always at right angles to it blue, and both are perpendicular to the direction of propagation z. Electromagnetic waves such as light, traveling in free space or another homogeneousisotropicnon attenuating medium, are properly described as transverse waves, meaning that a plane waves electric field vector E and magnetic field H are in directions perpendicular to or transverse to the direction of wave propagation E and H are also perpendicular to each other. Considering a monochromatic plane wave of optical frequency f light of vacuum wavelength has a frequency of f c where c is the speed of light, let us take the direction of propagation as the z axis. Being a transverse wave the E and H fields must then contain components only in the x and y directions whereas EzHz0. Using complex or phasor notation, we understand the instantaneous physical electric and magnetic fields to be given by the real parts of the complex quantities occurring in the following equations. As a function of time t and spatial position z since for a plane wave in the z direction the fields have no dependence on x or y these complex fields can be written as Ez,texey. Texey. 0eikztdisplaystyle vec Ez,tbeginbmatrixexey0endbmatrix ei. Tbeginbmatrixexey0endbmatrix eikz omega tand. Hz,thxhy. 0ei. Thxhy. Hz,tbeginbmatrixhxhy0endbmatrix ei. Tbeginbmatrixhxhy0endbmatrix eikz omega twhere n is the wavelength in the medium whose refractive index is n and T 1f is the period of the wave. Here ex, ey, hx, and hy are complex numbers. In the second more compact form, as these equations are customarily expressed, these factors are described using the wavenumberk2ndisplaystyle k2pi nlambda and angular frequency or radian frequency 2fdisplaystyle omega 2pi f. In a more general formulation with propagation not restricted to the z direction, then the spatial dependence kz is replaced by krdisplaystyle vec kcdot vec r where kdisplaystyle vec k is called the wave vector, the magnitude of which is the wavenumber.