CN101055397A - Self-aligning beam beam-splitter of photon crystal and splitting method - Google Patents
Self-aligning beam beam-splitter of photon crystal and splitting method Download PDFInfo
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- CN101055397A CN101055397A CN 200610073167 CN200610073167A CN101055397A CN 101055397 A CN101055397 A CN 101055397A CN 200610073167 CN200610073167 CN 200610073167 CN 200610073167 A CN200610073167 A CN 200610073167A CN 101055397 A CN101055397 A CN 101055397A
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Abstract
A photon crystal based self collimated light beam splitter is characterized in that the splitter comprises: a substrate; a dielectric materials layer provided on the substrate which is a two-dimension periodicity arranged dielectric column son array or metal son array to form the dielectric materials wherein the line defect is induced in a included angle direction.
Description
Technical field
The present invention relates to electromagnetic energy beam splitter, particularly a kind of beam splitter and beam-splitting method of the autocollimation light beam based on photonic crystal.
Background technology
Principle of the present invention is based on the band theory of photonic crystal.1987, E.Yablonovitch (Phys.Rev.Lett.58, p.2059,1987) and S.John (Phys.Rev.Lett.58, p.2059,1987) proposed the notion of photonic crystal respectively, and it is that notion analogy by traditional crystal comes.The electromagnetic Maxwell equation of the dielectric material by separating periodic arrangement can obtain the relation between electromagnetic wave vector and the energy, i.e. band structure.Most important characteristic of photonic crystal is exactly can be to the flexible control of photon.It mainly contains two kinds of situations to the control of photon: a kind of is that band structure shows when photonic crystal has band gap, the photon that is in the band gap frequency can not perfectly propagated in the photonic crystal, if inlead defective in photonic crystal, can make the light local in line defect, thereby also control the direction of propagation of light as optical waveguide flexibly.Another kind be the incident light frequency not in the forbidden band, light can be propagated in photonic crystal, its propagation characteristic is determined by band structure.2000, Japanese scientist Notomi is comprehensive and systematic to set forth light propagation characteristic (Phys.Rev.B 62, p.10696,2000) in photonic crystal, points out that the direction of propagation is by group velocity V
g=
kω (k) decision.Calculating by wave vector on the first Brillouin zone all directions, obtain the dispersion map that concerns between wave vector and the frequency, and the point of reciprocal space same frequency is linked to be a series of equifrequency lines, as Fig. 3, because the gradient of equifrequency line is exactly a group velocity, so from the shape of equifrequency line, can infer the direction that group velocity, thereby the propagation characteristic of light under the judgement different situations, as super prism, negative refraction still is autocollimatic propagation.At the equifrequency line is the group velocity direction unanimity of the position correspondence of straight line, and promptly autocollimation is propagated.The light of just certain frequency range and certain angle scope is meeting rectilinear propagation in photonic crystal, and can not disperse (as Fig. 4).
In order to realize that to autocollimatic light beam inlead defective in intact photonic crystal by regulating the size and the spacing of line defect pillar, realizes that two bundles of light beam separate (as Fig. 5) or three beams separation (as Fig. 6).
Summary of the invention
The object of the present invention is to provide a kind of beam splitter and beam-splitting method of the autocollimation light beam based on photonic crystal, it is by the inlead defective, regulates the line defect structure, realizes electromagnetic beam splitting.
The technical solution used in the present invention is:
The beam splitter of a kind of autocollimation light beam based on photonic crystal of the present invention is characterized in that, comprising:
One substrate;
One layer of dielectric material, this layer of dielectric material is produced on the substrate, and this layer of dielectric material is that medium pillar array or the metal column subarray that two-dimensional and periodic is arranged constitutes photonic crystal;
Angle direction inlead defective in the photonic crystal that the pillar array constitutes.
The angle of the angle in the wherein said photonic crystal is greater than 0 degree, less than 90 degree.
Wherein said two-dimensional and periodic is arranged the line that is meant the center of any adjacent three pillars in the array and is constituted the tetragonal lattice of isosceles right triangle, or constitutes the triangular crystal lattice of equilateral triangle.
A row or several rows pillar in the wherein said line defect is meant that its size and spacing change.
Wherein said layer of dielectric material is a silicon, silicon dioxide, aluminium oxide, gallium arsenide, indium phosphide or metal.
The beam splitter of a kind of autocollimation light beam based on photonic crystal of the present invention is characterized in that, comprising:
One substrate;
One dielectric material, this layer of dielectric material is produced on the substrate, and this layer of dielectric material is that medium or the metal that three-dimensional periodic is arranged constitutes photonic crystal, and this medium or metal are spheroid or gengon;
In an intracrystalline angle direction inlead defective.
The angle of the angle on the wherein said photonic crystal is greater than 0 degree, less than 90 degree.
A row or several rows medium in the wherein said line defect or metal are meant that its size and spacing change.
Wherein said layer of dielectric material is a silicon, silicon dioxide, aluminium oxide, gallium arsenide, indium phosphide or metal.
The beam-splitting method of a kind of autocollimation light beam based on photonic crystal of the present invention is characterized in that: comprise the steps:
(1) incident electromagnetic wave 1 satisfies the autocollimation propagation characteristic in photonic crystal;
(2) interact with line defect;
(3) be divided into the light beam of propagating forward, the light beam of Chuan Boing and the light beam of propagation to the right left.
Wherein said photonic crystal is two dimension or three-dimensional photon crystal structure.
The present invention has the following advantages:
Can be from any part coupling of device, this is based on the characteristics of the autocollimation light beam of photonic crystal;
The adjusting of beam splitting efficient be can realize, two bundles or three beams separation realized;
Principle is simple, and it is integrated to use photon widely.
Description of drawings:
For further specifying concrete technology contents of the present invention, below in conjunction with embodiment and accompanying drawing describes in detail as after, wherein:
Fig. 1 is the structural representation of beam splitter of the autocollimation light beam of the 2 D photon crystal that is made of the pillar array in the dielectric material of the present invention;
Fig. 2 is the cut-open view of Fig. 1;
Fig. 3 is the isofrequency map of the photonic crystal of Fig. 1 correspondence, and frequency is that the corresponding equifrequency line of 0.19 (c/a) and 0.18 (c/a) has is straight line greatly, and here a is the grating constant of photonic crystal, and c is a light velocity of propagation in a vacuum.Illustration rotates part sectional drawing behind 45 degree for Fig. 1, and the structure of the 2 D photon crystal of this isofrequency map correspondence is that specific inductive capacity is that the radius that has square to arrange in 12 the medium is the air pillar of 0.35a;
Fig. 4 is that the autocollimation light beam is propagated synoptic diagram in photonic crystal, the variation of the magnetic field intensity of expression electromagnetic wave propagation among the figure, and its structure is the identical structure of Fig. 1;
The autocollimation light beam that Fig. 5 is based on photonic crystal is divided into two synoptic diagram of restrainting, and promptly introducing the pillar spacing in figure one structure is a, and radius is the line defect of 0.48a;
The autocollimation light beam that Fig. 6 is based on photonic crystal is divided into the synoptic diagram of three beams, and promptly introducing the pillar spacing in figure one structure is 1.38a, and radius is the line defect of 0.38a;
Fig. 7 has shown the efficient of the beam splitting device of Fig. 5 correspondence, and this structure two light beams intensity in the certain frequency scope of dividing is the same as can be seen.
Embodiment
One substrate 7, this substrate 7 can be any dielectric material or metal material;
One layer of dielectric material 6, this layer of dielectric material 6 is produced on the substrate 7, this layer of dielectric material 6 is that medium pillar array or the metal column subarray that two-dimensional and periodic is arranged constitutes photonic crystal, described two-dimensional and periodic is arranged the tetragonal lattice that the line that is meant the center of any adjacent three pillars 61 in the array constitutes isosceles right triangle, or the triangular crystal lattice of formation equilateral triangle, described layer of dielectric material 6 is a silicon, silicon dioxide, aluminium oxide, gallium arsenide, indium phosphide or metal;
Angle direction inlead defective 5 in the photonic crystal that the pillar array constitutes, the angle of the angle on this photonic crystal are greater than 0 degree, and less than 90 degree, a row or several rows pillar 61 in this line defect 5 is meant that its size and spacing change.
The beam-splitting method of a kind of autocollimation light beam based on photonic crystal of the present invention comprises the steps:
(1) incident electromagnetic wave 1 satisfies the autocollimation propagation characteristic in photonic crystal, and described photonic crystal is two dimension or three-dimensional photon crystal structure;
(2) interact with line defect 5;
(3) be divided into the light beam of propagating forward 2, the light beam 3 of Chuan Boing and the light beam 4 of propagation to the right left.
The beam-splitting method of the autocollimation light beam based on photonic crystal of the present invention, incident electromagnetic wave 1 satisfies autocollimation propagation characteristic (Fig. 4) in photonic crystal, interact with line defect 5, is divided into the light beam of propagating forward 2, the light beam 3 of Chuan Boing, the light beam 4 of Chuan Boing left to the right.
The photonic crystal that the present invention relates to, the isofrequency map feature in its operating frequency range has the feature of Fig. 3, that is and, for certain frequency range, the equifrequency line is a straight line, and the direction of expression group velocity is identical, and light is propagated and can not dispersed along same direction in photonic crystal.
The beam-splitting method based on the autocollimation light beam of photonic crystal that the present invention relates to is to realize beam splitting to light by inlead defective in intact photonic crystal.
Example 1 is based on silica-based autocollimation beam splitter.The photonic crystal here (Fig. 1) is the air pillar 61 that square is arranged in the silicon medium, grating constant a=289.9nm, the radius of air pillar 61 is 0.35a=101.5nm, this photonic crystal in frequency 0.186 (c/a) in 0.192 (c/a) scope, the equifrequency line is essentially straight line (Fig. 3), the direction unanimity that light is propagated in photonic crystal.Along (1,0) direction inlead defective 5, the radius of its pillar 61 is 0.48a=139.2nm in this photonic crystal, and spacing is grating constant a=289.9nm.The change of magnetic field strength that light is propagated in this photonic crystal as shown in Figure 5, a branch of light has been divided into two bundles.Fig. 7 has shown the energy distribution of the two-beam that is divided, and as seen in whole autocollimation frequency range, can be good at dividing equally the energy of incident light.
Example 2, photonic crystal is identical with the structure of example 1, and only the radius of the pillar 61 of line defect is 0.38a=110.2nm, and spacing is 1.37a=397.2nm.The change of magnetic field strength that light is propagated in this photonic crystal as shown in Figure 6, a branch of light has been divided into three beams.
Claims (11)
1, a kind of beam splitter of the autocollimation light beam based on photonic crystal is characterized in that, comprising:
One substrate;
One layer of dielectric material, this layer of dielectric material is produced on the substrate, and this layer of dielectric material is that medium pillar array or the metal column subarray that two-dimensional and periodic is arranged constitutes photonic crystal;
Angle direction inlead defective in the photonic crystal that the pillar array constitutes.
2, the beam splitter of the autocollimation light beam based on photonic crystal according to claim 1 is characterized in that, the angle of the angle in the wherein said photonic crystal is greater than 0 degree, less than 90 degree.
3, the beam splitter of the autocollimation light beam based on photonic crystal according to claim 1, it is characterized in that, wherein said two-dimensional and periodic is arranged the line that is meant the center of any adjacent three pillars in the array and is constituted the tetragonal lattice of isosceles right triangle, or constitutes the triangular crystal lattice of equilateral triangle.
4, the beam splitter of the autocollimation light beam based on photonic crystal according to claim 1 is characterized in that, a row or several rows pillar in the wherein said line defect is meant that its size and spacing change.
5, the beam splitter of the autocollimation light beam based on photonic crystal according to claim 1 is characterized in that wherein said layer of dielectric material is a silicon, silicon dioxide, aluminium oxide, gallium arsenide, indium phosphide or metal.
6, a kind of beam splitter of the autocollimation light beam based on photonic crystal is characterized in that, comprising:
One substrate;
One dielectric material, this layer of dielectric material is produced on the substrate, and this layer of dielectric material is that medium or the metal that three-dimensional periodic is arranged constitutes photonic crystal, and this medium or metal are spheroid or gengon;
In an intracrystalline angle direction inlead defective.
7, the beam splitter of the autocollimation light beam based on photonic crystal according to claim 6 is characterized in that, the angle of the angle on the wherein said photonic crystal is greater than 0 degree, less than 90 degree.
8, the beam splitter of the autocollimation light beam based on photonic crystal according to claim 6 is characterized in that a row or several rows medium in the wherein said line defect or metal are meant that its size and spacing change.
9, the beam splitter of the autocollimation light beam based on photonic crystal according to claim 6 is characterized in that wherein said layer of dielectric material is a silicon, silicon dioxide, aluminium oxide, gallium arsenide, indium phosphide or metal.
10, a kind of beam-splitting method of the autocollimation light beam based on photonic crystal is characterized in that, comprises the steps:
(1) incident electromagnetic wave 1 satisfies the autocollimation propagation characteristic in photonic crystal;
(2) interact with line defect;
(3) be divided into the light beam of propagating forward, the light beam of Chuan Boing and the light beam of propagation to the right left.
11, the beam-splitting method of the autocollimation light beam based on photonic crystal according to claim 10 is characterized in that wherein said photonic crystal is two dimension or three-dimensional photon crystal structure.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102569968A (en) * | 2012-01-12 | 2012-07-11 | 中国科学院上海微系统与信息技术研究所 | Electromagnetic beam control method, beam deflector, beam splitter and changeover switch of beam deflector and beam splitter |
| CN103675993A (en) * | 2013-12-31 | 2014-03-26 | 中国科学院半导体研究所 | Integratable light quantum walking device based on photonic crystal auto-collimation effect |
| CN104570206A (en) * | 2015-01-09 | 2015-04-29 | 中国科学院大学 | Beam splitting method based on photonic crystal standing wave resonance |
| WO2015078119A1 (en) * | 2013-11-27 | 2015-06-04 | 中国科学院上海微系统与信息技术研究所 | Photonic crystal supporting high-frequency sensitivity autocollimation, and design method and application |
| CN107219625A (en) * | 2017-06-24 | 2017-09-29 | 复旦大学 | A kind of design method for the photonic crystal panel for supporting frequency sensitive auto-collimation phenomenon |
| CN107315222A (en) * | 2017-06-01 | 2017-11-03 | 深圳凌波近场科技有限公司 | Surface wave photonic crystal |
| CN110441859A (en) * | 2019-07-18 | 2019-11-12 | 太原理工大学 | A kind of two-dimentional hexagonal boron nitride photon crystal heterojunction structure of light wave one-way transmission |
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2006
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102569968A (en) * | 2012-01-12 | 2012-07-11 | 中国科学院上海微系统与信息技术研究所 | Electromagnetic beam control method, beam deflector, beam splitter and changeover switch of beam deflector and beam splitter |
| CN102569968B (en) * | 2012-01-12 | 2013-11-06 | 中国科学院上海微系统与信息技术研究所 | Electromagnetic beam control method, beam deflector, beam splitter and changeover switch of beam deflector and beam splitter |
| WO2015078119A1 (en) * | 2013-11-27 | 2015-06-04 | 中国科学院上海微系统与信息技术研究所 | Photonic crystal supporting high-frequency sensitivity autocollimation, and design method and application |
| US9684094B2 (en) | 2013-11-27 | 2017-06-20 | Shanghai Insitute Of Microsystem And Information Technology, Chinese Academy Of Sciences | Photonic crystal supporting high frequency sensitivity self-collimation phenomenon and design method and use thereof |
| CN103675993A (en) * | 2013-12-31 | 2014-03-26 | 中国科学院半导体研究所 | Integratable light quantum walking device based on photonic crystal auto-collimation effect |
| CN103675993B (en) * | 2013-12-31 | 2016-02-24 | 中国科学院半导体研究所 | Based on the accessible site light quantum walking device of photon crystal self-aligning effect |
| CN104570206A (en) * | 2015-01-09 | 2015-04-29 | 中国科学院大学 | Beam splitting method based on photonic crystal standing wave resonance |
| CN107315222A (en) * | 2017-06-01 | 2017-11-03 | 深圳凌波近场科技有限公司 | Surface wave photonic crystal |
| CN107315222B (en) * | 2017-06-01 | 2024-02-02 | 深圳凌波近场科技有限公司 | surface wave photonic crystal |
| CN107219625A (en) * | 2017-06-24 | 2017-09-29 | 复旦大学 | A kind of design method for the photonic crystal panel for supporting frequency sensitive auto-collimation phenomenon |
| CN110441859A (en) * | 2019-07-18 | 2019-11-12 | 太原理工大学 | A kind of two-dimentional hexagonal boron nitride photon crystal heterojunction structure of light wave one-way transmission |
| CN110441859B (en) * | 2019-07-18 | 2020-06-26 | 太原理工大学 | Two-dimensional hexagonal boron nitride photonic crystal heterostructure with optical wave unidirectional transmission |
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