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

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...

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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 duty cycle of sub-wavelength components or the material properties of components, which is not easy to control through external control.

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