Polarization sensitivity of interference filters based on FERROMAGNET

摘要

The invention relates to the field of manufacturing optical antireflection coatings and interference filters.; The proposed utility model is a device consisting of two mirrors separated by a ferromagnetic layer. Mirror systems are not successively arranged magnetic dielectric quarter-wave plates with different refractive indices, the thickness and the permittivity . etc. The half-wave plate thickness ferromagnet and the permittivity Dividing mirrors, magnetized by an external field, whose lines of force directed parallel to the boundaries between the layers. Ranking plates such that the structure has mirror symmetry about a plane passing through the center of the ferromagnetic layers parallel to the boundaries between the layers. In the proposed configuration, an interference filter has a maximum transmittance of electromagnetic radiation at a frequency with a wavelength .; For electromagnetic radiation propagating in the ferromagnet perpendicularly to the magnetic field lines is split into ordinary and extraordinary wave. For the ordinary wave permeability magnetic material is equal to one. For the extraordinary wave permeability has a resonance frequency-field dependence Which is a consequence of cross-ferromagnetic resonance at frequency . When the frequencies of the maximum transmittance of the interference filter and the ferromagnetic resonance frequency there is an extraordinary wave transmission suppression, passing the ordinary wave does not change. Thus, the technical result is achieved by the frequency-filtering polarization of electromagnetic radiation in the microwave range.