![]() ![]() EIT is also based on destructive interference, but it is induced by a laser instead of dipole-dipole interactions. DIET is also closely related to another phenomenon, called electromagnetically-induced transparency (EIT). ![]() The scientists explain that, on the most basic level, DIET results from destructive interference between the electromagnetic waves emitted by the quantum emitters. In particular, the medium may become transparent at a particular frequency that can be controlled to a certain extent. Here, the researchers have theoretically shown that strong dipole-dipole interactions in a dense vapor of quantum emitters can be used to manipulate the spectral properties of the light scattered by the emitters. The collective effects usually result in an enhancement of the light-matter interaction, although a very complicated one. In a dense "vapor" of many quantum emitters, strong dipole-dipole couplings can then occur. ![]() In this case, the electromagnetic field experienced by an emitter depends not only on the light beam striking its surface, but also on all of the electromagnetic fields radiated by all of its neighbors, which in turn are affected by the emitter in question.Įach quantum emitter can have a dipole, meaning a positive side and a negative side, due to an uneven distribution of electrons within the emitter. But the physics becomes much more complex when dealing with two or more interacting emitters. "We showed how light scattering by a nanometric size system, collectively responding through strongly coupled two-level atoms/molecules, can be manipulated by altering the material parameters: an otherwise opaque medium can be rendered transparent at any given frequency, by adequately adjusting the relative densities of the atoms/molecules composing it."Īs the scientists explain, light scattering is very well understood when dealing with individual quantum emitters that is, single atoms or molecules. "The significance of our work is in the discovery of a very neat phenomenon (dipole-induced electromagnetic transparency ), which may be used to control light propagation in optically active media," coauthor Eric Charron, Professor at the University of Paris-Sud in Orsay, France, told. This ability could have several potential applications, such as producing slow light or stopped light, along with applications in the field of attosecond physics. They theoretically show how to induce transparency in otherwise opaque materials using the complex dipole-dipole interactions present in a large number of interacting quantum emitters, such as atoms or molecules. In a new study published in Physical Review Letters, researchers have developed a new method for manipulating light scattering. ![]()
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