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One-dimensional magnetic photonic crystal for achieving broadband optical isolation

A photonic crystal, broadband light technology, applied in optics, nonlinear optics, instruments, etc., can solve problems such as suboptimal isolation effect and difficult preparation.

Active Publication Date: 2015-06-17
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned structures have a large number of layers, which is not easy to prepare in terms of technology, and the isolation effect in the broadband range is not optimal.

Method used

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  • One-dimensional magnetic photonic crystal for achieving broadband optical isolation
  • One-dimensional magnetic photonic crystal for achieving broadband optical isolation
  • One-dimensional magnetic photonic crystal for achieving broadband optical isolation

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Effect test

Embodiment 1

[0035] Such as figure 2 The first composite structure S of the present invention shown 1 =S 0 / M / S 0 , the magnetron sputtering coating method can be used on the optical substrate according to the structure S 1 The three films were deposited sequentially, totaling 83 layers. When the external magnetic field is parallel to the direction of the optical path, the first composite structure S of the present invention1 The fluctuation curves of transmittance and Faraday rotation angle near the central wavelength are as follows Figure 4 shown. In order to make the first composite structure S of the present invention 1 get 45 o The Faraday rotation angle of , we need to rotate the external magnetic field in the horizontal direction, the first composite structure S 1 The values ​​of transmittance and Faraday rotation angle vary with the rotation angle of the applied magnetic field as follows: Figure 5 shown. Rotate the applied magnetic field horizontally to the direction of...

Embodiment 2

[0037] Such as image 3 The second composite structure S of the present invention shown 2 =S 0 / M / S 0 / M / S 0 , the magnetron sputtering coating method can be used on the optical substrate according to the structure S 2 The three films were deposited sequentially, for a total of 125 layers. When the external magnetic field is parallel to the direction of the optical path, the first composite structure S of the present invention 2 The fluctuation curves of transmittance and Faraday rotation angle near the central wavelength are as follows Figure 7 shown. In order to make the first composite structure S of the present invention 2 get 45 o The Faraday rotation angle of , we need to rotate the external magnetic field in the horizontal direction, the first composite structure S 2 The values ​​of transmittance and Faraday rotation angle vary with the rotation angle of the applied magnetic field as follows: Figure 8 shown. Rotate the applied magnetic field horizontally to...

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Abstract

Provided is a one-dimensional magnetic photonic crystal for achieving broadband optical isolation. The structural formula of the basic component S0 of the one-dimensional magnetic photonic crystal is [H / L] 2 / M / [L / H] 5 / M / [H / L] 2 / M / [L / H] / 2 / M / [H / L] 5 / M / [L / H] 2, wherein H is silicon, L is silicon oxide, and M is cerium mixed yttrium iron garnet. A first composite structure S1 of the one-dimensional magnetic photonic crystal meets the following equation: S1=S0 / M / S0, and a second composite structure S2 of the one-dimensional magnetic photonic crystal meets the following equation: S2=S0 / M / S0 / M / S0. According to the one-dimensional magnetic photonic crystal, the composite structures reduce the total layer number of film layers, reduce preparation difficulty and improve work stability of an optical isolator.

Description

technical field [0001] The invention relates to a broadband optical isolator, in particular to a one-dimensional magneto-photonic crystal for realizing a broadband optical isolator. Background technique [0002] An optical isolator is a non-reciprocal passive device that only allows forward-transmitted light to pass through. Its main function is to prevent reverse-transmitted light from adversely affecting the light source and improve the stability of optical system transmission. [0003] The existing optical isolator is 45 from the direction of the optical axis o It consists of a pair of polarizers and a Faraday rotator placed between the two polarizers. The Faraday rotator includes a central magneto-optic crystal and a ring-shaped permanent magnet surrounding the magneto-optic crystal. [0004] The rapid development of modern optical communication technology requires the miniaturization of devices used in optical circuits for easy integration. Due to the limitation of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/09
Inventor 费宏明刘欣杨毅彪陈智辉武建加李琳
Owner TAIYUAN UNIV OF TECH
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