![]() They can be used for trapping, cooling and manipulating particles, e.g.They play an essential role in the formation of tails of comets (see above), as already suggested by Johannes Kepler in 1619.Light forces are relevant in a number of very different situations: They are also important for trapping particles because they serve to dampen the motion of a trapped particle. There are also non-conservative (dissipative) light forces, which are velocity-dependent. A red-detuned laser beam can be used for trapping. from the dipole interaction with a laser beam the frequency of which is lower or higher than that of a resonant transition of the atom the force is then directed towards locations with higher or lower optical intensity, respectively. When calculating light forces on atoms, it is often more convenient to derive the light forces from the gradient of a potential which arises from the interaction of the atoms with the light field. Gaussian) laser beam occurs, which pulls the sphere into the region of highest optical intensity. For example, refraction of light in a transparent sphere can redirect the light so that a force perpendicular to a (e.g. However, the effective force can also have a direction which is different from the propagation direction. In simple cases, a light force is described as radiation pressure, exerting a force in the propagation direction of the absorbed light. They have later been experimentally proven by the Russian physicist Pyotr Lebedev in 1900. James Clerk Maxwell, the creator of the famous Maxwell equations, has later substantially developed further the understanding of light forces. Light forces have been first considered by the astronomer Johannes Kepler. the tails of comets, which always occur on the side opposite to the Sun and consist of dust particles dragged away by the light. Such light forces are responsible for e.g. Photons carry not only energy, but also momentum.Īs a consequence, momentum is transferred (i.e., a force is exerted) when a particle absorbs light or alters its direction (e.g. How to cite the article suggest additional literature ![]() Encyclopedia > letter L > Light forces Light Forcesĭefinition: forces associated with absorption, reflection or scattering of light ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |