Applications Of Low Dielectric Constant Materials In The The Reflection-mode Magneto-optic Isolator

The concept of photonic crystal was put forward from the end of 1980 s, and it has become an important research field of modern science. The photonic crystal is a kind of artificial material which is made of metal material or material with periodic or quasi periodic arrangement. Usingthe photon localization and band gap of the photonic crystal, one dimensional photonic crystal with defect can enhance magneto optic effect under the external magnetic field. One dimensional magneto photonic crystal has a large rotation angle and achieve higher energy transfer rate at the same time. Low dielectric constant super material applied to one-dimensional magnetic photon crystal, can not only increase the rotation angle, but also enhance the energy transfer rate. It provides a way for the integration of magneto optic isolator, but also provides a new possible applications for low permittivity metamaterials.Now, one-dimensional magnetic photonic crystal structure to achieve optical isolation exist some common problems: first, the spectral response is extremely narrow. It can achieve optical isolation only in the center wavelength. When the wavelength of light source fluctuations near the center wavelength or in broadband communication is not very satisfying; Second, bandwidth range spectrum response curve is under flat and it influences performance of magneto optic isolator; Third, the structure has many layers, and is not easy to actual preparation.In view of the above problems, this paper designs one dimensional magneto photonic crystal structure with low dielectric constant super material, and analyzes the performance of the structure by using the transfer matrix method. The contents and results of this paper can be summarized as follows:1. In this work, the Kerr magneto-optical effect of one-dimensional single defect magnetic photonic crystals is explored by using transfer matrix method. The numerical results show that, adopting low dielectric constant metamaterial, the one-dimensional single defect magnetic photonic crystal may own large interlamination impedance difference, which can form a strong local field in the magneto-optical dielectric layer, induce Kerr rotation angle to be near 45 degree. In addition, the large interlamination impedance difference may enhance the reflection of the light, produce higher energy reflectivity. The research may be helpful to manufacture the less layers and good performance reflection-mode magneto-optic isolator, and provide new possible appl ications for low dielectric constant metamaterials.2. In this work, the Faraday magneto-optical effect of one-dimensional single defect magnetic photonic crystals is explored by using transfer matrix method. The numerical results show that, one-dimensional defective photonic crystal structure with low dielectric constant materials can enhance the Faraday magneto optic effect and realize the broadband optical isolation. The Faraday rotation in the center wavelength can also be close to 45 degrees and achieve higher energy transmission rate. Research results can help to make simple and flat spectrum response magneto optic isolator. This provides a choice for designing Faraday magnetic optical isolator.