![]() The magnetic field causes a difference in phase velocity between these circularly polarized components. from arrangements of waveplates and polarizers.Ĭoncerning the physical origin of the polarization rotation, one may consider a linearly polarized beam as a superposition of two circularly polarized beams. This non-reciprocal behavior distinguishes Faraday rotators e.g. If some linearly polarized beam is sent through a Faraday rotator and back again after reflection at a mirror, the polarization changes of the two passes add up, rather than canceling each other. Note that the Verdet “constant” usually exhibits a substantial wavelength dependence: it is smaller for longer wavelengths.Īn important aspect is that the change of polarization direction is defined only by the magnetic field direction and the sign of the Verdet constant. Where is the Verdet constant of the material, is the magnetic flux density (in the direction of propagation), and is the length of the rotator medium. The total rotation angle can be calculated as If the light is linearly polarized in some direction, this polarization direction is continuously rotated during the passage through the medium. The magnetic field lines have approximately the same direction as the beam direction, or the opposite direction. How to cite the article suggest additional literatureĪ Faraday rotator is a magneto-optic device, where light is transmitted through a transparent medium which is exposed to a magnetic field. Definition: devices which can rotate the polarization state of light, exploiting the Faraday effectĬategories: general optics, photonic devices
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