Magnetic control frequency modulation far-infrared optical switch and implementation method thereof

A far-infrared light and optical switch technology, applied in optics, nonlinear optics, instruments, etc., can solve problems such as difficult external regulation, and achieve the effect of magnetic field frequency modulation switch

Inactive Publication Date: 2017-02-15
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the existing methods of making hyperbolic metamaterials mostly control the hyperbolic dispersion frequency by changing the

Method used

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  • Magnetic control frequency modulation far-infrared optical switch and implementation method thereof
  • Magnetic control frequency modulation far-infrared optical switch and implementation method thereof
  • Magnetic control frequency modulation far-infrared optical switch and implementation method thereof

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Embodiment 1

[0017] like figure 1 As shown, a magnetically controlled frequency-tunable far-infrared optical switch includes a magnesium ferrite-based metamaterial and a dielectric substrate arranged in sequence. The magnesium ferrite-based metamaterial described therein consists of thin layers of magnesium ferrite and aluminum oxide thin layers alternately stacked in the x-axis direction to form a one-dimensional periodic layered structure. The thicknesses of the magnesium ferrite film and the aluminum oxide film in the x-axis direction are respectively d 1 and d 2 , are less than 1 / 20 of the wavelength of the electromagnetic wave selected to be incident on the optical switch; the lengths of the magnesium ferrite film and the aluminum oxide film in the y-axis and z-axis directions are both greater than 10 times the wavelength.

[0018] According to the equivalent medium theory, the magnetic permeability of metamaterials can be expressed as where μ yy =μ zz = f 1 mu 1 + f 2 mu 2 ...

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PUM

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Abstract

The invention relates to a magnetic control frequency modulation far-infrared optical switch which comprises a magnesium ferrite based metamaterial and a dielectric substrate which are arranged in sequence. The magnesium ferrite based metamaterial is formed by alternative overlapping of a magnesium ferrite film 1 and an aluminum oxide film 2 in the X-axis direction and is of a one-dimensional periodic layered structure. The thicknesses of the magnesium ferrite film 1 and the aluminum oxide film 2 in the X-axis direction are both smaller than one twentieth of the wave length of the selected electromagnetic wave for entering the optical switch. The lengths of the magnesium ferrite film 1 and the aluminum oxide film 2 in the Y-axis direction and Z-axis direction are both 10 times greater than the wave length. Accordingly, the magnesium ferrite based metamaterial can be obtained. The provided structure can control the magnetic susceptibility of the magnesium ferrite film under the regulation of an external magnetic field, the transformation of the magnesium ferrite based metamaterial from an ordinary non-magnetic medium to a magnetic hyperbolic medium is achieved, accordingly, the transmissivity of an incident TE polarized wave is controlled, and the optical switch is obtained.

Description

technical field [0001] The invention relates to a magnetically controlled frequency-adjustable far-infrared optical switch, in particular to a far-infrared optical switch capable of adjusting the working frequency by magnetic field strength. Background technique [0002] Photonic technology is good at information transmission, and has the advantages of broadband, large capacity and parallel processing. Therefore, technical fields such as information transmission have been occupied by photonic technology, such as optical fiber communication and optical fiber sensors. To realize optical path conversion in the field of optical fiber communication, the necessary components are optical switches. There are many existing methods to realize optical switches, such as traditional mechanical optical switches, micromechanical optical switches, thermo-optical switches, and acousto-optic switches, etc., which are widely used in different occasions because of their respective characteristi...

Claims

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Application Information

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IPC IPC(8): G02F1/29
CPCG02F1/29
Inventor 宋戈许静平
Owner TONGJI UNIV
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