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an asymmetric transmitter

A transmitter, asymmetric technology, applied in the direction of instruments, optics, diffraction grating, etc., can solve the problem of large volume

Active Publication Date: 2021-07-20
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention solves the defect of large volume existing in current asymmetrical transmitters by providing an asymmetrical transmitter

Method used

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Embodiment Construction

[0025] The embodiment of the present invention provides an asymmetric transmitter, which can realize the effect of forward propagation and reverse isolation in a narrow wavelength range, and solves the defect of large volume existing in the current asymmetric transmitter.

[0026] The technical solution in the embodiment of the present invention is to solve the above-mentioned problems, and the general idea is as follows:

[0027] The embodiment of the present invention utilizes an asymmetric grating with a metal-metal-metal structure to unidirectionally excite surface plasmon polaritons (SPPs), thereby realizing asymmetric transmission. SPPs are a kind of electromagnetic wave mode propagating along the medium / metal interface, which is a special kind of surface wave. Its field strength decays exponentially along the direction perpendicular to the interface. According to the dispersion relation of SPPs, at the same frequency, the wave vector k of light in vacuum 0 Wave vector...

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Abstract

The invention discloses an asymmetric transmitter, which comprises: a first metal grating layer, a metal layer, a second metal grating layer and a dielectric substrate which are sequentially stacked, and the structural parameter value of the first metal grating layer satisfies a preset parameter condition , so that the light wave incident on the surface of the first metal grating layer is converted into surface plasmon; The penetration depth of the element in the metal, so that the surface plasmons converted by the surface of the first metal grating layer enter the second metal grating layer; the second metal grating layer is embedded in the dielectric substrate, and the first metal grating layer The grating constants of the layers are different, and the structural parameter values ​​of the second metal grating layer do not meet the preset parameter conditions, so that the light waves incident on the surface of the second metal grating layer cannot be converted into surface plasmons, which solves the problem of the asymmetric transmitter. large size defect.

Description

technical field [0001] The invention relates to the technical field of optical devices, in particular to an asymmetric transmitter. Background technique [0002] Asymmetric transmitter is an optical passive device, which plays an indispensable role in optical communication, optical network, and can be used to control or cancel noise, protect the light source in lasers and one-way detection / one-way sensing system etc. Its function is to allow transmission when a beam of light is incident from a certain direction; but when the beam of light is incident in the opposite direction, the transmittance is very low. [0003] The realization of an asymmetric transmitter often needs to break the time-domain symmetry of the system, but the current asymmetric transmitter has the disadvantage of large volume. Contents of the invention [0004] By providing an asymmetrical transmitter, the present invention solves the defect of large volume existing in the current asymmetrical transmit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/00G02B5/18
CPCG02B5/008G02B5/18
Inventor 黄黎蓉巴春发令永红
Owner HUAZHONG UNIV OF SCI & TECH
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