CN104932056B - A kind of photonic crystal annular chamber terahertz filter - Google Patents
A kind of photonic crystal annular chamber terahertz filter Download PDFInfo
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- CN104932056B CN104932056B CN201510357765.5A CN201510357765A CN104932056B CN 104932056 B CN104932056 B CN 104932056B CN 201510357765 A CN201510357765 A CN 201510357765A CN 104932056 B CN104932056 B CN 104932056B
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- annular chamber
- photonic crystal
- waveguide
- medium
- lattice structure
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/122—Basic optical elements, e.g. light-guiding paths
- G02B6/1225—Basic optical elements, e.g. light-guiding paths comprising photonic band-gap structures or photonic lattices
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/12007—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind forming wavelength selective elements, e.g. multiplexer, demultiplexer
Abstract
The present invention is a kind of photonic crystal annular chamber THz wave wave filter, it is characterised in that the photonic crystal annular chamber terahertz filter includes Two dimensional square lattice structure photon crystal 1, input waveguide 2, scattering medium post 3, annular chamber 4, single square medium block 5, output waveguide 6；Wherein, Two dimensional square lattice structure photon crystal 1 is the medium column type silicon photonic crystal along X Z plane periodic distributions；Row's dielectric posts are removed in Two dimensional square lattice structure photon crystal 1 and form input waveguide 2；Annular chamber 4 is provided with Two dimensional square lattice structure photon crystal 1；Annular chamber includes 3 two parts of single inner square medium block 5 and scattering medium post；Single square medium block 5 turns clockwise certain angle；Annular chamber 4 is respectively spaced two row's dielectric posts with input waveguide 2 and output waveguide 6.
Description
Technical field
The present invention is a kind of New-type photon crystal annular chamber terahertz filter, using including single square medium block
New Ring-like Type cavity configuration, it is related to the technical field of THz wave communication and optical information processing.
Background technology
THz wave (Terahertz, THz) typically refers to the electromagnetic wave of 0.1THz to 10THz wave bands, and it is last
Not by full appreciation and the frequency window utilized.The extraordinary electromagnetic wave spectral position of THz ripples assigns its many superior characteristic.By light
Sub- crystal technology and THz technology, which is combined, can design the wave filter for meeting following THz communication requirements.Compared to traditional THz
THz wave filter of the wave filter based on photonic crystal has many advantages, while also has wavelength selection, noise filtering, gain equal
The effect such as weighing apparatus, therefore it has good application prospect in THz communications.
And in THz communications, photonic crystal THz wave filters are usually realized by two methods, and one kind is in the photonic crystal
Introduce point defect and realize filtering, this kind of wave filter is functionally similar to Wave decomposing multiplexer, poor with traditional wave filter
Very not big, insertion loss is larger, therefore this kind of wave filter can not meet the requirement of high speed THz communications；And another kind be by
Introduce what suitable point defect was realized with corresponding line defect in labyrinth photonic crystal, existing this kind of wave filter at most can
Realize that dual wavelength filters, if now wanting to realize the filtering of more multi-wavelength, this wave filter can only be concatenated, but this meeting pair
Filtration efficiency produces a very large impact.And photonic crystal annular chamber, for point defect, the scope of dimensional variation is big, and structure is set
Haggle over flexibly, flexible design can be carried out according to actual conditions, therefore, the exploratory development to photonic crystal annular chamber has very
Important meaning and prospect.
In photonic crystal annular chamber, the coupling of cavity configuration and waveguide is by the structure of chamber and the refractive index shadow of dielectric posts
Ring, increase or the size and the anglec of rotation for reducing intracavitary dielectric posts, the wavelength of output waveguide output is also different.Waveguide and resonance
Change between chamber close to the arrangement of the dielectric posts of waveguide edge can also improve resonance wavelength and the coupling of waveguide resonant cavity
Efficiency, it is the effective ways for the efficiency for improving photon crystal filter.
The content of the invention
Technical problem：It is an object of the invention to provide a kind of photonic crystal annular chamber terahertz filter.By analyzing ring
Influence of the shape chamber Different structural parameters to transmission spectrum, change the length of side and the anglec of rotation of scattering medium post and inner square medium block
Degree, reach optimum filtering effect, Q values are high, and transmitance is also high.
Technical scheme:It is brilliant that the photonic crystal annular chamber terahertz filter of the present invention includes Two dimensional square lattice structure photon
Body, input waveguide, scattering medium post, annular chamber, single square medium block, output waveguide；Wherein, Two dimensional square lattice structure
Photonic crystal is the medium column type silicon photonic crystal along X-Z plane periodic distribution；In Two dimensional square lattice structure photonic crystal
One row's dielectric posts of middle removal form input waveguide；Annular chamber is provided with Two dimensional square lattice structure photonic crystal；Annular chamber bag
Include single two parts of inner square medium block and scattering medium post；Single square medium block turns clockwise an inclination angle
Degree；Annular chamber is respectively spaced two row's dielectric posts with input waveguide and output waveguide.
The left end of the input waveguide is input, and flashlight is that high bass wave inputs from the left end of input waveguide, from output
The bottom output of waveguide.
The inside of the annular chamber is made up of single square medium block, and it is one sharp to turn clockwise on the basis of this
Angle angle, there are four scattering medium posts in the surrounding of annular chamber, the light wave into annular chamber is more effectively propagated.
Using high bass wave as incidence wave, coupling occurs with annular chamber in input waveguide, by adjusting annular chamber
Structure can make some specific light waves enter load waveguide, play a part of selecting light wave.
Beneficial effect：A kind of New-type photon crystal annular chamber terahertz filter proposed by the present invention.This wave filter is two
Tie up in tetragonal silicon medium column type photonic crystal, linear defect wave-guide area, annular chamber and input waveguide are combined, wherein waveguide
Area provides the effective transmission path of THz wave in the photonic crystal, and the structure by adjusting annular chamber can make some specific
Light wave, which enters, downloads waveguide, plays a part of selecting light wave.By the side for changing scattering medium post and inner square dielectric posts
The long and anglec of rotation, so as to improve the filtering performance of wave filter.The photon crystal filter flexibly changing of this structure is square
The various parameters of lattice photonic crystal, the structure of annular chamber and size, the length of side of inner square dielectric posts and the anglec of rotation and
Size of scattering medium post etc., therefore the wave filter of different operating wavelength can be designed as needed.
Brief description of the drawings
Fig. 1 is a kind of structure chart of photonic crystal annular chamber terahertz filter of the present invention,
Have in figure：Two dimensional square lattice structure photon crystal 1, input waveguide 2, scattering medium post 3, annular chamber 4, it is single just
Square medium block 5, output waveguide 6.
Fig. 2 is when squeezing into THz ripples using Pulse wave sources, draws the transmission spectrum of the wave filter.
Time domain steady-state response figure when Fig. 3 a are the light wave incidence that wavelength is 94.053 μm,
Fig. 3 b are corresponding stable state field intensity map.
Embodiment
In order to adapt to the development of high-speed, ultra wide band THz wave communication system, we have proposed a kind of new photon
Crystal annular chamber terahertz filter, makes it be operated in terahertz wave band, has actual application value.We using waveguide and
The structure that annular chamber is combined, realize to wavelength to be 94.053 μm of filtering, transmitance 0.98556, insertion loss is
0.063dB。
A kind of New-type photon crystal annular chamber terahertz filter of the present invention includes tetragonal silicon photonic crystal, incoming wave
Lead, annular chamber, output waveguide；Wherein, tetragonal photonic crystal be along the square periodic distribution of X-Z plane in atmosphere
Silicon medium column type photonic crystal, therebetween introduce line defect form input waveguide, be separated by below input waveguide two rows Jie
It is the square medium block to rotate to an angle that matter post, which introduces an interior media post, and surrounding is with four scattering medium posts
Annular chamber, output waveguide are located at below annular chamber and are separated by two row's dielectric posts；THz wave inputs from the left end of input waveguide, from defeated
Go out the bottom output of waveguide.
Flashlight is the THz wave that wavelength is 94.053 μm, and THz wave inputs from the left end of input waveguide, from output
The bottom output of waveguide.
A kind of filtering principle of New Ring-like Type chamber THz ripple Single wavelength wave filters of the present invention is：When all frequencies light wave by
When input port left end inputs, the light wave of the frequency only in band gap can just be propagated in photonic crystal waveguide, and other frequencies
The light wave of rate due to reflect, scatter or loss effect and can not be propagated in waveguide.When light wave reaches ring resonator, because
Acted on for the local frequency-selecting of resonator, resonance can just be produced by only meeting the light wave of the resonant frequency of intracavitary, and is coupled into
Ring resonator, then exported, otherwise by the right-hand member output from input waveguide.
Design parameter is：A=30 μm of lattice constant, R=5.1575 μm of medium column radius, silicon medium refraction index n=3.4；
Single square medium block length of side L for 92 μm and turns clockwise 6 ° inside annular chamber, its refractive index n '=3.4；Scattering medium
R1=5 μm of column radius.
Claims (3)
1. a kind of photonic crystal annular chamber terahertz filter, the photonic crystal annular chamber terahertz filter includes two-dimension square
Lattice structure photonic crystal (1), input waveguide (2), scattering medium post (3), annular chamber (4), single square medium block (5),
Output waveguide (6)；Wherein, Two dimensional square lattice structure photonic crystal (1) is the medium column type silicon along X-Z plane periodic distribution
Photonic crystal；Row's dielectric posts are removed in Two dimensional square lattice structure photonic crystal (1) and form input waveguide (2)；In two dimension
Annular chamber (4) is provided with tetragonal structure photonic crystal (1)；It is characterized in that annular chamber includes single inner square medium
(3) two parts of block (5) and scattering medium post；Single square medium block (5) turns clockwise an angle of inclination；Annular chamber
(4) two row's dielectric posts are respectively spaced with input waveguide (2) and output waveguide (6).
A kind of 2. photonic crystal annular chamber terahertz filter according to claim 1, it is characterised in that the incoming wave
The left end for leading (2) is input, and flashlight is that high bass wave inputs from the left end of input waveguide (2), from the bottom of output waveguide (6)
Output.
A kind of 3. photonic crystal annular chamber terahertz filter according to claim 1, it is characterised in that the annular chamber
(4) inside is made up of single square medium block (5), and the sharp angle that turned clockwise on the basis of this, in ring
The surrounding of shape chamber has four scattering medium posts (3), the light wave into annular chamber is more effectively propagated.
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| CN201510357765.5A CN104932056B (en) | 2015-06-25 | 2015-06-25 | A kind of photonic crystal annular chamber terahertz filter |
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| CN104932056B true CN104932056B (en) | 2017-11-14 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI641882B (en) * | 2017-06-15 | 2018-11-21 | 中華學校財團法人中華科技大學 | All-optical encoding device |
| CN108983353B (en) * | 2018-08-03 | 2019-11-29 | 中国计量大学 | Variable multi-channel terahertz wave power splitter |
| CN108761638B (en) * | 2018-08-03 | 2020-10-09 | 中国计量大学 | Multi-output-port terahertz wave power divider |
| CN110333568B (en) * | 2019-07-12 | 2021-02-12 | 山东昊盾警用装备有限公司 | Open type MIM waveguide structure |
| CN111009707A (en) * | 2019-12-12 | 2020-04-14 | 南京邮电大学 | high-Q-value radio frequency band elimination filter based on two-dimensional photonic crystal |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005091467A (en) * | 2003-09-12 | 2005-04-07 | Nec Corp | Photonic crystal optical functional element |
| JP2005274927A (en) * | 2004-03-24 | 2005-10-06 | Furukawa Electric Co Ltd:The | Photonic crystal device |
| CN104267462A (en) * | 2014-08-21 | 2015-01-07 | 南京邮电大学 | Annular cavity structure terahertz wave photonic crystal filter |
| CN104459988A (en) * | 2014-12-10 | 2015-03-25 | 欧阳征标 | High-polarization-degree and high-extinction-ratio TM photo-switch based on panel photonic crystals |
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2015
- 2015-06-25 CN CN201510357765.5A patent/CN104932056B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005091467A (en) * | 2003-09-12 | 2005-04-07 | Nec Corp | Photonic crystal optical functional element |
| JP2005274927A (en) * | 2004-03-24 | 2005-10-06 | Furukawa Electric Co Ltd:The | Photonic crystal device |
| CN104267462A (en) * | 2014-08-21 | 2015-01-07 | 南京邮电大学 | Annular cavity structure terahertz wave photonic crystal filter |
| CN104459988A (en) * | 2014-12-10 | 2015-03-25 | 欧阳征标 | High-polarization-degree and high-extinction-ratio TM photo-switch based on panel photonic crystals |
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