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Design of an Asymmetric Circular Cavity Filter Based on Surface Plasmons

An asymmetric structure and surface plasmon technology, applied in the field of micro-nano optoelectronics, can solve the problem of narrow filter bandwidth and achieve the effects of wide bandwidth, increased stopband width and low transmittance

Active Publication Date: 2020-04-21
GUILIN UNIV OF ELECTRONIC TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The filter corresponding to direct coupling is generally a bandpass filter, and the filter corresponding to boundary coupling is generally a bandstop filter, and the bandwidth of the filter formed by these two coupling methods is relatively narrow

Method used

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  • Design of an Asymmetric Circular Cavity Filter Based on Surface Plasmons
  • Design of an Asymmetric Circular Cavity Filter Based on Surface Plasmons
  • Design of an Asymmetric Circular Cavity Filter Based on Surface Plasmons

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Embodiment Construction

[0014] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific examples and with reference to the accompanying drawings. It should be noted that the directional terms mentioned in the examples, such as "upper", "lower", "middle", "left", "right", "front", "rear", etc., are only referring to the directions of the drawings. Therefore, the directions used are only for illustration and are not intended to limit the protection scope of the present invention.

[0015] The present invention is implemented by adopting the following scheme: a kind of asymmetric structure circular cavity filter based on surface plasmons, such as figure 1 As shown, it consists of a metal film 1; an incident waveguide 2; an outgoing waveguide 3; a circular resonant cavity 4; and a rectangular aperture 5.

[0016] The present invention is an asymmetric structure circular ca...

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Abstract

The invention discloses design of a surface plasmon-based asymmetric structure circular cavity filter. A metal-dielectric-metal asymmetric structure filter is constructed by adopting a caliber coupling method; and two circular resonant cavities are connected with optical waveguide through two rectangular apertures. In the embodiment of the invention, a metal thin film is made of a metal silver material, and the metal thin film is integrally square. The resonance coupling effect of the surface plasmon SPP and the resonant cavity is utilized; and the method has the characteristic that the size of the radius of the resonant cavities and the number of the resonant cavities and the like are adjusted, so that the stop band of the filter can be remarkably increased, the stop band is flat, and thetransmission rate is extremely low.

Description

technical field [0001] The invention relates to the field of micro-nano optoelectronic technology, in particular to the design of an asymmetric structure circular cavity filter based on surface plasmons. Background technique [0002] Surface plasmon polaritons (SPPs) are evanescent waves propagating at the metal-dielectric interface, a collective oscillation generated by the interaction between light waves with the same resonant frequency and free electrons in metals. Due to the diffraction limit, traditional optics cannot meet the needs of integrated optics, and the device size is limited to the order of wavelength. SPP devices in highly integrated optical circuits have broad application prospects, because by changing the topography of the metal surface, SPPs interact with the light field to achieve active manipulation of light propagation on the sub-wavelength scale, enabling Realization of various SPPs components and circuits offers potential for miniaturization of integ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/208
CPCH01P1/208
Inventor 肖功利窦婉滢杨宏艳李海鸥张法碧傅涛孙堂友
Owner GUILIN UNIV OF ELECTRONIC TECH
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