CN209690558U - Photon crystal filter with tangent bend L shape microcavity - Google Patents
Photon crystal filter with tangent bend L shape microcavity Download PDFInfo
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- CN209690558U CN209690558U CN201920161414.0U CN201920161414U CN209690558U CN 209690558 U CN209690558 U CN 209690558U CN 201920161414 U CN201920161414 U CN 201920161414U CN 209690558 U CN209690558 U CN 209690558U
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- photon crystal
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- 230000005540 biological transmission Effects 0.000 description 4
- 230000005684 electric field Effects 0.000 description 4
- 238000002834 transmittance Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
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- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
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- 238000013082 photovoltaic technology Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
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Abstract
The utility model provides a kind of photon crystal filter with tangent bend L shape microcavity, the 2 D photon crystal formed including multiple dielectric posts periodic arrangements, the dielectric posts for removing a row of horizontal in the 2 D photon crystal form output waveguide, the certain media column for removing another row of horizontal in the 2 D photon crystal forms input waveguide, the remaining dielectric posts form the reflection cavity adjacent with the input waveguide, remove the certain media column of several rows between the input waveguide and the output waveguide in the 2 D photon crystal to form two L-type defects being centrosymmetric, two L-type defects and its internal dielectric posts surrounded constitute resonant cavity, two very wide forbidden bands can be generated, make it possible to achieve the filter action of two wavelength periods, filter effect is fine, with very high transmissivity and compared with low-loss.
Description
Technical field
The utility model relates to a kind of photonic crystal, especially a kind of photonic crystal filtering with tangent bend L shape microcavity
Device.
Background technique
Photonic crystal is a kind of dielectric constant in periodically variable novel artificial structure, is divided into one-dimensional, two and three dimensions,
Its characteristic is with forbidden photon band.The light wave of forbidden band respective frequencies can not be propagated wherein, and therefore, one piece of photonic crystal can be with shape
At natural bandstop filter.When introducing certain defect in the photonic crystal or changing somewhere dielectric constant, light will be destroyed
The sub- original periodicity of crystal, to form defect state, when frequency of light wave and defect state frequency match, light wave will be limited in
It is interior, to realize good filter function.Photonic crystal also has the characteristics that miniaturization, easy of integration, will be with more grinding in the future
The value studied carefully
Micro-cavity structure is to introduce point defect in the photonic crystal, achievees the purpose that coupling filtering.The theoretically transmission of microcavity
Coefficient can reach very high value, pass through size and the dielectric constant etc. for adjusting microcavity medium column, thus it is possible to vary microcavity
Resonance frequency and mode are a kind of very ideal filtering devices.
Silicon is that have in the fields such as photovoltaic technology and microminiature semiconductor inverter technology as a kind of semiconductor material
Very important application.And its dispersion is very small, can effectively reduce the dispersion loss of wave.In addition to this, silicon is various
Characteristic has all been studied very thorough, and it is the first choice for making filter material that processing technology is sheerly, and cheap.So
And how to overcome the shortcomings of the prior art that production is gone to be easily integrated, the light with tangent bend L shape microcavity that Modulatory character is high
Sub- crystal filter is researcher's one of emphasis urgently to be resolved.
Utility model content
The purpose of this utility model is to provide a kind of photon crystal filters with tangent bend L shape microcavity, to solve
The problem that the existing photon crystal filter with tangent bend L shape microcavity is not easy of integration, Modulatory character is low.
In order to achieve the above object, the utility model provides a kind of photonic crystal filtering with tangent bend L shape microcavity
Device, the 2 D photon crystal formed including multiple dielectric posts periodic arrangements, it is characterised in that: in the 2 D photon crystal
The dielectric posts for falling a row of horizontal form output waveguide, remove the certain media cylindricality of another row of horizontal in the 2 D photon crystal
At input waveguide, the remaining dielectric posts form the reflection cavity adjacent with the input waveguide, in the 2 D photon crystal
Remove the certain media column of several rows between the input waveguide and the output waveguide to form two L being centrosymmetric
Type defect, two L-type defects and its internal dielectric posts surrounded constitute resonant cavity.
Optionally, the 2 D photon crystal is hexagonal lattice photonic crystal, and the hexagonal lattice photonic crystal
Medium column radius is 0.21a, and a is lattice constant, and the dielectric posts of the hexagonal lattice photonic crystal are silica glass matrix, and background is
Air.
Optionally, the lattice constant a=540nm of the hexagonal lattice photonic crystal.
Optionally, the dielectric posts of the 2 D photon crystal are in 19*17 array distribution.
Optionally, the reflection cavity includes six dielectric posts, and six dielectric posts are located at same row.
Optionally, 5 row's dielectric posts are surrounded in two L-type defects.
Optionally, it after by input waveguide input in the waveguide signal of Gaussian Profile, filters out in two setting wavelength
Waveguide signal except range, waveguide signal of the output waveguide output within two setting wave-length coverages,
Optionally, two setting wave-length coverages are respectively 548nm-798nm and 1071nm-1345nm.
Optionally, the input terminal of the input waveguide and two output ends of the output waveguide are provided with point of observation.
In the photon crystal filter provided by the utility model with tangent bend L shape microcavity, including multiple dielectric posts
The 2 D photon crystal that periodic arrangement is formed, the dielectric posts for removing a row of horizontal in the 2 D photon crystal form output wave
It leads, the certain media column for removing another row of horizontal in the 2 D photon crystal forms input waveguide, the remaining dielectric posts
The reflection cavity adjacent with the input waveguide is formed, removes the input waveguide and the output wave in the 2 D photon crystal
The certain media column of several rows between leading is to form two L-type defects being centrosymmetric, two L-type defects and its interior
The dielectric posts that portion surrounds constitute resonant cavity, can generate two very wide forbidden bands, make it possible to achieve the filtering of two wavelength periods
Effect, filter effect is fine, with very high transmissivity and compared with low-loss, in addition, having the photonic crystal of tangent bend L shape microcavity
Filter belongs to nanometer scale, small in size to be easily integrated, and controllability is high, to filter with the photonic crystal of tangent bend L shape microcavity
The application of device in a communications system provides help.
Detailed description of the invention
Fig. 1 is the two-dimentional light of the photon crystal filter provided by the embodiment of the utility model with tangent bend L shape microcavity
The structural schematic diagram of sub- crystal；
Fig. 2 is that the TE of the photon crystal filter provided by the embodiment of the utility model with tangent bend L shape microcavity is polarized
Band gap distribution map under mode；
The distribution map of the electric field that Fig. 3 is waveguide signal provided by the embodiment of the utility model when being 681nm；
The transmittance figure that Fig. 4 is waveguide signal provided by the embodiment of the utility model when being 681nm；
The distribution map of the electric field that Fig. 5 is waveguide signal provided by the embodiment of the utility model when being 1203nm；
Transmittance figure when being 1203nm that Fig. 6 is waveguide signal provided by the embodiment of the utility model.
Specific embodiment
Specific embodiment of the present utility model is described in more detail below in conjunction with schematic diagram.It is retouched according to following
It states and claims, will be become apparent from feature the advantages of the utility model.It should be noted that attached drawing is all made of very simplification
Form and use non-accurate ratio, only to it is convenient, lucidly aid in illustrating the purpose of the utility model embodiment.
As shown in Figure 1, present embodiments providing a kind of photon crystal filter with tangent bend L shape microcavity, including more
The 2 D photon crystal that a dielectric posts periodic arrangement is formed removes the medium cylindricality of a row of horizontal in the 2 D photon crystal
At output waveguide 2, the certain media column for removing another row of horizontal in the 2 D photon crystal forms input waveguide 1, remaining
The dielectric posts form the reflection cavity 3 adjacent with the input waveguide 1, remove the input waveguide in the 2 D photon crystal
The certain media column of several rows between 1 and the output waveguide 2 is to form two L-type defects being centrosymmetric, two institutes
It states L-type defect and its internal dielectric posts surrounded constitutes resonant cavity 4.
Further, the 2 D photon crystal is hexagonal lattice photonic crystal, and the hexagonal lattice photonic crystal
Medium column radius is 0.21a, and a is lattice constant, and a=540nm, the dielectric posts of the hexagonal lattice photonic crystal are silica glass
Matrix, background are air.Hexagonal lattice structure is compared to broader forbidden band is more prone to produce for tetragonal lattice structure, so choosing
Use hexagonal lattice structure.
Optionally, the dielectric posts of the 2 D photon crystal are in 19*17 array distribution, and are arranged along the face X-Z, wherein
The input waveguide 1 is located at same row with the reflection cavity 3, i.e. row's dielectric posts removal certain media column forms the incoming wave
1 is led, remaining six dielectric posts constitute the reflection cavity 3.The reflection cavity 3 is in the tail portion of the input waveguide 1, to reflect
The waveguide signal of the output of input waveguide 1 is stated, scattering loss is reduced, improves efficiency of transmission.
Further, the resonant cavity 4 includes the 5 row's media surrounded in two L-type defects and two L-type defects
Column, dielectric posts described in every row only include the part dielectric posts.The resonant cavity 4 is located at the input waveguide 1 and the output
Between waveguide 2, after being in the waveguide signal of Gaussian Profile by the input waveguide 1 input, the setting in forbidden band is only fallen in
Waveguide signal in wave-length coverage could pass through and couple output, realize the effect of specific frequency (wavelength) filtering, that is, filter out
Waveguide signal except two setting wave-length coverages, the waveguide signal within two setting wave-length coverages pass through output wave
Lead 2 outputs.In the present embodiment, two setting wave-length coverages are respectively 548nm-798nm and 1071nm-1345nm.
Optionally, the input terminal of the input waveguide 1 and two output ends of the output waveguide 2 are provided with point of observation
(K1, K2, K3), for observing input waveguide 1, the waveguide signal in output waveguide 2 is to analyze transmission case.
Fig. 2 is the band gap under the TE polarization mode of the photon crystal filter with tangent bend L shape microcavity of the present embodiment
Distribution, wherein abscissa is K vector, and ordinate is normalized frequency, as shown in Fig. 2, the light with tangent bend L shape microcavity
Sub- crystal filter has two apparent band gap, and corresponding band gap wavelength section is 548nm-798nm and 1071nm- respectively
1345nm, center resonant frequency are respectively 681nm and 1203nm.
Fig. 3 and Fig. 4 be respectively waveguide signal be 681nm when distribution map of the electric field and transmittance figure, Fig. 5 and Fig. 6 be respectively
Distribution map of the electric field and transmittance figure when waveguide signal is 1203nm, as shown in Fig. 3 and Fig. 4, Fig. 5 and Fig. 6, waveguide signal is by beam
It is tied in the photon crystal filter with tangent bend L shape microcavity and transmits, transmissivity is very high, and peak value can almost reach
100% transmission, and loss is very low, there is preferable filtering performance.
To sum up, in the photon crystal filter provided by the embodiment of the utility model with tangent bend L shape microcavity, including
The 2 D photon crystal that multiple dielectric posts periodic arrangements are formed removes the dielectric posts of a row of horizontal in the 2 D photon crystal
Output waveguide is formed, the certain media column for removing another row of horizontal in the 2 D photon crystal forms input waveguide, remaining
The dielectric posts form the reflection cavity adjacent with the input waveguide, remove in the 2 D photon crystal input waveguide and
The certain media column of several rows between the output waveguide is to form two L-type defects being centrosymmetric, two L-types
Defect and its internal dielectric posts surrounded constitute resonant cavity, can generate two very wide forbidden bands, make it possible to achieve two waves
The filter action of long section, filter effect is fine, with very high transmissivity and compared with low-loss, in addition, having tangent bend L shape microcavity
Photon crystal filter belong to nanometer scale, small in size to be easily integrated, controllability is high, for the light with tangent bend L shape microcavity
The application of sub- crystal filter in a communications system provides help.
The preferred embodiment that above are only the utility model, does not play the role of any restrictions to the utility model.
Any person of ordinary skill in the field, in the range of not departing from the technical solution of the utility model, to the utility model
The technical solution and technology contents of exposure make the variation such as any type of equivalent replacement or modification, belong to without departing from the utility model
Technical solution content, still fall within the protection scope of the utility model.
Claims (9)
1. a kind of photon crystal filter with tangent bend L shape microcavity, which is characterized in that periodically arranged including multiple dielectric posts
The 2 D photon crystal formed is arranged, the dielectric posts for removing a row of horizontal in the 2 D photon crystal form output waveguide, described
The certain media column for removing another row of horizontal in 2 D photon crystal forms input waveguide, and the remaining dielectric posts are formed and institute
The adjacent reflection cavity of input waveguide is stated, is removed between the input waveguide and the output waveguide in the 2 D photon crystal
The certain media column of several rows two L-type defects and its internal is surrounded with forming two L-type defects being centrosymmetric
Dielectric posts constitute resonant cavity.
2. having the photon crystal filter of tangent bend L shape microcavity as described in claim 1, which is characterized in that the two dimension
Photonic crystal is hexagonal lattice photonic crystal, and the medium column radius of the hexagonal lattice photonic crystal is 0.21a, and a is crystalline substance
The dielectric posts of lattice constant, the hexagonal lattice photonic crystal are silica glass matrix, and background is air.
3. having the photon crystal filter of tangent bend L shape microcavity as claimed in claim 2, which is characterized in that the hexagonal
The lattice constant a=540nm of lattice photonic crystal.
4. having the photon crystal filter of tangent bend L shape microcavity as claimed in claim 2, which is characterized in that the two dimension
The dielectric posts of photonic crystal are in 19*17 array distribution.
5. having the photon crystal filter of tangent bend L shape microcavity as claimed in claim 4, which is characterized in that the reflection
Chamber includes six dielectric posts, and six dielectric posts are located at same row.
6. having the photon crystal filter of tangent bend L shape microcavity as claimed in claim 5, which is characterized in that two L
5 row's dielectric posts are surrounded in type defect.
7. having the photon crystal filter of tangent bend L shape microcavity as claimed in claim 6, which is characterized in that by described
After input waveguide input is in the waveguide signal of Gaussian Profile, the waveguide signal set except wave-length coverage at two is filtered out, it is described
Waveguide signal of the output waveguide output within two setting wave-length coverages.
8. having the photon crystal filter of tangent bend L shape microcavity as claimed in claim 7, which is characterized in that described in two
Setting wave-length coverage is respectively 548nm-798nm and 1071nm-1345nm.
9. having the photon crystal filter of tangent bend L shape microcavity as described in claim 1, which is characterized in that the input
The input terminal of waveguide and two output ends of the output waveguide are provided with point of observation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920161414.0U CN209690558U (en) | 2019-01-30 | 2019-01-30 | Photon crystal filter with tangent bend L shape microcavity |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920161414.0U CN209690558U (en) | 2019-01-30 | 2019-01-30 | Photon crystal filter with tangent bend L shape microcavity |
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| CN209690558U true CN209690558U (en) | 2019-11-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109828329A (en) * | 2019-01-30 | 2019-05-31 | 广西师范大学 | Photon crystal filter with tangent bend L shape microcavity |
| CN111505756A (en) * | 2020-05-29 | 2020-08-07 | 华北水利水电大学 | Optimization method of three-channel photonic crystal filter of multi-mode resonant cavity |
-
2019
- 2019-01-30 CN CN201920161414.0U patent/CN209690558U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109828329A (en) * | 2019-01-30 | 2019-05-31 | 广西师范大学 | Photon crystal filter with tangent bend L shape microcavity |
| CN109828329B (en) * | 2019-01-30 | 2024-03-01 | 广西师范大学 | Photonic crystal filter with double-bending L-shaped microcavity |
| CN111505756A (en) * | 2020-05-29 | 2020-08-07 | 华北水利水电大学 | Optimization method of three-channel photonic crystal filter of multi-mode resonant cavity |
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