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Surface plasmon polariton type flat channel filter based on metal-insulator-metal structure

A surface plasmon and metal structure technology, applied in the direction of optical filters, can solve problems that have not been well solved, affect the consistency of multi-channel parallel processing, power balance, etc.

Inactive Publication Date: 2013-05-01
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] According to the above analysis, the flatness problem of the SPP multi-channel filter based on the MIM waveguide has not been well solved, or needs to be greatly improved; and the flatness is a key index to measure the multi-channel to the filter, it directly Affect the consistency, power balance, etc. of multi-channel parallel processing

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  • Surface plasmon polariton type flat channel filter based on metal-insulator-metal structure
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Embodiment Construction

[0037] The implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0038] The structure of the flat multi-channel filter proposed by the present invention is as follows figure 1 shown. Between the two metal interlayers, insert N periods formed by alternate arrangements of two different refractive index media, the height of which (in the z direction) is 45nm; the N periods have the same structure and are composed of K sub-periods, Each sub-period contains a high-refractive-index medium layer (medium 1) and a low-refractive-index medium layer (medium 2), and the Kth sub-period in the Nth period defaults to a low-refractive index medium, where N and K are positive integers ; In each periodic structure, the refractive index of medium 1 is n 1 , whose length (in the x direction) increases linearly, denoted as L 1 , L 2 ...L K-1 , L K ;The length of medium 2 is fixed as L b , the refractive index n 2 . Here, n...

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Abstract

The invention discloses a surface plasmon polariton type flat channel filter based on a metal-insulator-metal structure. The surface plasmon polariton type flat channel filter is composed of two metal interlayers and an insulator layer between the two metal interlayers, the insulator layer comprises alternately-arranged insulators in two kinds of refractive indexes, which form N cycles; the N cycles are same in the structure and are composed of K subcycles, each of the subcycles contains one insulator 1 with high index of refraction and one insulator 2 with low high index of refraction, and the Kth subcycle n the Nth cycle is lack of one insulator with low high index of refraction. For the N cycles, the lengths of the K insulators with high index of refraction in each cycle are increased progressively and linearly in the same rule, the consistency of dispersionloss in multiple filtering channels is improved, and the multichannel flat filtering is achieved. The surface plasmon polariton type flat channel filter based on the metal-insulator-metal structure, disclosed by the invention has important application on photo-communication and photoelectric signal processing, and miniaturization integrated photoelectronic devices and modules.

Description

technical field [0001] The invention mainly relates to the fields of surface plasmon effect, photoelectric device, optical communication and photoelectric signal processing, and in particular to a surface plasmon effect type flat multi-channel filter with a metal-medium-metal structure. Background technique [0002] Surface plasmons (SPs) or surface plasmon polaritons (SPPs) are a special form of electromagnetic field localized at the metal-dielectric (also called dielectric, insulator) interface. The metal surface propagates and decays exponentially to both sides perpendicular to the interface. Due to its unique surface propagation properties, SPP-based metal nanostructures can confine light in the sub-wavelength scale, and thus have important application value in future nano-integrated optical circuits. Among them, metal-insulator-metal (metal-insulator-metal, MIM, also known as metal-dielectric-metal or metal-insulator-metal) waveguide is a typical SPP waveguide or devic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/20
Inventor 罗昕邹喜华潘炜周志罗斌闫连山
Owner SOUTHWEST JIAOTONG UNIV
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