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Electromagnetic wave transmission device with regulative and controllable magnetic field based on sub-monolayer wavelength metal grating and preparation

A metal grating and sub-wavelength technology, which is applied in the direction of waveguide devices, electrical components, diffraction gratings, etc., to achieve the effects of wide application range of wavelengths, easy miniaturization and integration, and small structure size

Inactive Publication Date: 2011-07-20
NANJING UNIV
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Problems solved by technology

[0016] In order to solve the problem that there is no simple way in the prior art to realize the active controllability of the polarization-independent electromagnetic wave transmission spectrum, the purpose of the present invention is to propose a polarization-independent electromagnetic wave transmission system based on a single-layer sub-wavelength metal grating that can be controlled by a magnetic field. Devices and fabrication methods

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  • Electromagnetic wave transmission device with regulative and controllable magnetic field based on sub-monolayer wavelength metal grating and preparation

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Embodiment Construction

[0028] The present invention can be realized through the following technical measures. The materials involved in the present invention are low-loss metals and magnetically active media that can transmit electromagnetic waves, wherein the low-loss metals can generally use gold, silver or aluminum, etc.; the magnetically active media can generally use microwave ferrite materials YIG and microwave in the microwave band For ferrite, etc., semiconductor materials InSb and InAs can generally be used in the terahertz band, and magneto-optical materials Bi:GdIG and magnetic semiconductor materials CdMnTe can be generally used in the infrared and visible light bands.

[0029] For the above-mentioned devices in the microwave band and the terahertz band, due to the relatively long wavelength of the corresponding electromagnetic wave, the value of the structural parameter of the grating is relatively large. One-dimensional periodic subwavelength metal gratings can be produced by metal etc...

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Abstract

Disclosed is an electromagnetic wave transmission device with regulative and controllable magnetic field based on sub-monolayer wavelength metal grating; the device comprises a sub-monolayer wavelength metal grating and magnetoactive medium filled in the slit of the sub-monolayer metal grating; the metal part of the device and the magnetoactive medium have the same thickness, the thickness at least meets and supports the lowest-level Fabry-Perot cavity resonance demand of the designed work wavelength in the grating slit; the period and slit of the grating are shorter than the wavelength of the electromagnetic wave. By changing the size of the additional magnetic field, the propagation constant of the waveguide mode in the metal grating slit can be regulated to change the electromagnetic transmission characteristic of the device and realize the purpose of initial regulation of polarization-independent electromagnetic wave transmission spectrum and the electromagnetic wave transmission spectrum magnetic field.

Description

technical field [0001] The invention relates to an electromagnetic wave transmission device, in particular to a polarization-independent electromagnetic wave transmission device based on a single-layer sub-wavelength metal grating whose magnetic field can be adjusted. Background technique [0002] In 1998, French scientist T.W.Ebbesen and others published an article (Extraordinary optical transmission through sub-wavelength hole arrays) in Nature. They found in experiments that when electromagnetic waves are incident on a metal film with a two-dimensional sub-wavelength hole array, the The zero-order transmission spectrum exhibits a series of abnormal transmission peaks with high transmittance at wavelengths longer than the array period, and the magnitude of the transmittance is much larger than the results predicted by the classical pinhole transmission theory. This phenomenon is often referred to as an anomalous transmission phenomenon. They believe that this is because w...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/18H01P1/218
Inventor 王慧田白强陈璟程晨丁剑平
Owner NANJING UNIV
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