Method for regulating free spectral range by equilong rectangular cavity surface plasma band pass filter

A surface plasmon, band-pass filter technology, applied in the directions of light guide, optics, instruments, etc., can solve the problem of not being able to adjust the free spectral range of the filter, and achieve large-scale tuning, flexible large-scale tuning, and flexible adjustment. Effect

Inactive Publication Date: 2012-07-25
闫连山 +1
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Problems solved by technology

Although the existing surface plasmon filters based on a single frequency-selective structure have advantages in some aspects, neither type of filter can flexibly adjust the free spectral range of the filter

Method used

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  • Method for regulating free spectral range by equilong rectangular cavity surface plasma band pass filter
  • Method for regulating free spectral range by equilong rectangular cavity surface plasma band pass filter
  • Method for regulating free spectral range by equilong rectangular cavity surface plasma band pass filter

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] figure 1 It is a schematic structural diagram of a bandpass surface plasmon filter that realizes tunable free spectral range in the present invention, and the filter adopts a three-layer waveguide structure based on metal-insulator-metal. The structures 101 , 102 , 103 , and 104 are insulators, here air is selected, and its dielectric constant is 1. Structure 105 is a metal thin film. We choose silver as the commonly used material at present, and its frequency-dependent dielectric constant is selected as the commonly used Drude model:

[0019] ϵ m ( w ) = ϵ ∞ - ω P 2 / [ ω ( ω + iγ ...

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Abstract

The invention discloses a method for regulating a free spectral range by an equilong rectangular cavity surface plasma band pass filter. The method comprises the steps of: changing the position of a groove (103) in a rectangular cavity (102) under the condition of unchangeable length of the rectangular cavity (102) for realizing the flexible and adjustable free spectral range; and changing the position of one peak wavelength by adopting a geometrical parameter selectivity of the groove (103) under the condition that the groove (103) is in some special positions so as to realize the flexible and adjustable free spectral range of a filter. According to the invention, on the basis of ensuring that the surface plastic filter is realized, the flexible and adjustable free spectral range of the filter is realized, and the flexibility of a photon integrated loop is enhanced.

Description

technical field [0001] The invention relates to the fields of surface plasmons, integrated photonic devices and metal waveguides. Background technique [0002] Surface plasmons have good application prospects in highly integrated photonic devices and circuits because they can overcome the traditional diffraction limit and can manipulate beams at sub-wavelength dimensions. As an important device, filter has been widely used in various optical systems. Existing surface plasmon filters can be roughly divided into two categories: filters based on periodic structures and filters based on a single frequency-selective structure. Since a filter based on a periodic structure requires multiple periods, when the number of periods N is greater than 9, the size of the periodic structure will exceed the sub-wavelength range, which is not conducive to the miniaturization and integration of photonic devices and circuits. At the same time, the filter based on the periodic structure has a l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/293G02B6/122
Inventor 郭迎辉闫连山温坤华郭振陈智宇潘炜罗斌邹喜华张志勇
Owner 闫连山
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