Wave polarisation - definition
Wave polarisation - definition
Polarisation of a wave is a property of transverse waves, such as electromagnetic waves, that describes the direction and manner in which a field vector - most commonly an electric field - changes over time in a plane perpendicular to the direction of wave propagation. In the case of electromagnetic waves, which consist of electric and magnetic fields oscillating perpendicular to each other and to the direction of wave propagation, polarisation refers to the electric field vector.
Others forms of polarisation exist, depending on the trajectory of the end of the electric field vector at a point in space. Polarisation can be linear, if the vector oscillates along a single, fixed axis; circular, if it staggers in a circle with a constant angular velocity; or elliptical, if it moves along an ellipse. The direction of rotation of the vector in the case of circular or elliptical polarisation can be clockwise or anti-clockwise, which is important in the analysis of wave propagation in inhomogeneous or anisotropic media.
Polarisation is crucial in radio technology, optics, telecommunications, radar and antenna systems. Choosing the right type of polarisation affects the efficiency of signal transmission and reception, minimisation of interference and compatibility of systems. For example, in radio communications, transmitting and receiving antennas must have compatible polarisation directions to ensure maximum transmission efficiency. In optics, polarisation is used to filter light, in the study of material properties and in display technology.
In propagation environments such as the atmosphere or fibre optics, polarisation can change due to reflection, refraction, dispersion or birefringence. In such cases, systems are used to control or compensate for changes in polarisation to maintain signal integrity. The mathematical description of polarisation often uses the vector formalism or Jones and Stokes matrices, which allow the analysis of the polarisation state and its transformation in optical and electromagnetic systems.
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