CN102043261A - Photonic crystal magneto-optical circulator and preparation method thereof - Google Patents
Photonic crystal magneto-optical circulator and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a photonic crystal magneto-optical circulator comprising a first medium material columns in an air background, the first medium material columns are arranged in the shape of two-dimensional tetragonal lattice; the photonic crystal magneto-optical circulator also comprises a photonic crystal waveguide which includes a transverse photonic crystal waveguide and a longitudinal photonic crystal waveguide which are mutually intercrossed, a second medium material column used for guiding light and positioned at the cross connection of the transverse photonic crystal waveguide and the longitudinal photonic crystal waveguide, four identical magneto-optical material columns uniformly positioned around the second medium material columns, and at least three identical third medium material columns respectively positioned outside the three magneto-optical material columns. The photonic crystal magneto-optical circulator provided by the invention can respectively realize single direction optical circulating transmission among three ports arranged in the shape of T and among four ports arranged in the shape of a cross. The photonic crystal magneto-optical circulator provided by the invention is advantageous in that it has a concise form and a compact structure, and is suitable for serving as an anti-interference component in a photonic crystal integrated optical circuit.
Description
Technical field
The invention belongs to photonic crystal integrated device technical field, relate to "T"-shaped three ports of a kind of 2 D photon crystal, " ten " font four port magneto-optic circulators and manufacture methods thereof.
Background technology
Magneto-optic circulators is to subdue the Primary Component that light signal is crosstalked and improved the element integrated level in the integrated optics.Magneto-optic circulators is utilized the distinctive non-inequality character of magneto-optic memory technique, the folk prescription that can realize light signal between passage is to the transmission of going in ring, reaching the purpose that prevents signal reflex, eliminates signal crosstalk, guarantees the light path system normal operation, is indispensable performance optimization element in the integrated optical circuit.
At present, utilize the photonic crystal all-optical logic element to realize that the integrated complex optical path of difference in functionality is in the popular research, as utilize " with ", " or ", photonic crystal basic logic functions elements such as " non-", distance make up logic light paths such as photonic crystal half adder, photonic crystal comparer, photonic crystal A/D (D/A) converter.The research and development of photonic crystal logic integrated optical circuit have potential using value for development optical integrated chip of new generation.Yet along with the increase of element integrated level in the photonic crystal integrated optical circuit, the interference of light signal significantly strengthens between the element, light path even can't finish normal logic function under the serious situation.Therefore, develop corresponding magneto-optic circulators technology and become the key technical problem that improves the transmission of photonic crystal integrated optical circuit signal stabilization, guarantees the required solution of light path system operate as normal.
Existing photonic crystal logic element is to realize in air substrate-medium rod structure (tetragonal lattice arrangement) substantially, [for dielectric substrate-air column structure, the band gap of the TE mould of air substrate-medium rod structure is dark, and (the dark benefit of band gap is: under same performance index, the size of needed photonic crystal is little, be easy to improve integrated level), avoided the interference of TM pattern, the operating characteristic excellence, and structural form is simple and clear, be easy to design and produce], and existing several photonic crystal circulator is to realize that in dielectric substrate-air column structure (hexagonal lattice arrangement) there is certain limitation in its range of application substantially.Therefore, the research of photonic crystal magneto-optic circulators need be done further expansion at aspects such as structure type, function application, particularly researches and develops the photonic crystal magneto-optic circulators of the air substrate-medium rod structure (tetragonal lattice arrangement) that is complementary with existing photonic crystal logic element.
The photonic crystal magneto-optic circulators has a significant application value for extensive photonic crystal logic element is integrated, they help to eliminate the influence that signal cross-talk and light beam reflux in the light path, helping promoting the function match of each element in the light path, is indispensable anti-interference element in the integrated optical circuit.
Summary of the invention
Technical matters to be solved by this invention is to utilize "T"-shaped three ports of optically-active characteristics design of magneto-optic memory technique, " ten " font four port photonic crystal magneto-optic circulators and manufacture methods thereof, realizes the belt transmission of single directional light between three ports, four ports respectively.
The technical scheme that solves the technology of the present invention problem is: a kind of photonic crystal magneto-optic circulators, it comprises the first dielectric material post in the air background, the first dielectric material post in the described photonic crystal is two-dimentional tetragonal lattice and arranges, each first dielectric material post occupies a lattice of tetragonal lattice, horizontal or vertical distance at the center of adjacent two first dielectric material posts arbitrarily is a grating constant, described photonic crystal magneto-optic circulators also comprises a photon crystal wave-guide, described photon crystal wave-guide comprises cross-coupled horizontal photon crystal wave-guide and longitudinal photon crystal waveguide mutually, one is positioned at the second dielectric material post described horizontal photon crystal wave-guide and cross connection place of longitudinal photon crystal waveguide and that play the leaded light effect, four identical evenly is arranged on magneto-optic memory technique post around the second dielectric material post, and at least three the 3rd identical dielectric material posts, described the 3rd dielectric material post is separately positioned on the outside of described three magneto-optic memory technique posts.
As a further improvement on the present invention, described cross-coupled horizontal photon crystal wave-guide mutually and longitudinal photon crystal waveguide are formed "T"-shaped photon crystal wave-guide, described "T"-shaped photon crystal wave-guide comprises three ports, the 3rd a dielectric material post that is positioned at the outside of described magneto-optic memory technique post all is set on each port direction, a point defect air chamber is arranged in the arranged outside of the 4th magneto-optic memory technique post.
As a further improvement on the present invention, described cross-coupled horizontal photon crystal wave-guide mutually and longitudinal photon crystal waveguide are formed " ten " font photon crystal wave-guide, described " ten " font photon crystal wave-guide comprises four ports, and the 3rd a dielectric material post that is positioned at the outside of described magneto-optic memory technique post all is set on each port direction.
The described first dielectric material post, the second dielectric material post and the 3rd dielectric material post are silicon materials, and refractive index is 3.4, the radius size difference of the described first dielectric material post, the second dielectric material post and the 3rd dielectric material post.
As a further improvement on the present invention, described horizontal photon crystal wave-guide and longitudinal photon crystal waveguide constitute by removing a row and the row first dielectric material post in the described photonic crystal, wherein, the length of the horizontal photon crystal wave-guide of described "T"-shaped photon crystal wave-guide is na, the length of longitudinal photon crystal waveguide is (n-1) a/2, the horizontal photon crystal wave-guide of described " ten " font photon crystal wave-guide and the length of longitudinal photon crystal waveguide are na, a is the grating constant of photonic crystal, and n is the odd number more than or equal to 9.
Preferably, described n is 9 or 11 or 13 or 15.
As a further improvement on the present invention, described four magneto-optic memory technique posts are distributed in four the most contiguous crystallographic site places of the described second dielectric material post, and the distance at the center of the center of each magneto-optic memory technique post and the second dielectric material post is a grating constant.
As a further improvement on the present invention, described point defect air chamber is made of the first dielectric material post at the crystallographic site place that removes described second dielectric material post top second vicinity.
As a further improvement on the present invention, described three the 3rd dielectric material posts are distributed in the described second dielectric material post left, below and right-hand second three contiguous crystallographic site places, and the distance at the center of the center of each the 3rd dielectric material post and the second dielectric material post is two grating constants.
As a further improvement on the present invention, described four the 3rd dielectric material posts are distributed in four crystallographic site places of second vicinity of the described second dielectric material post, and the distance at the center of the center of each the 3rd dielectric material post and the second dielectric material post is two grating constants.
And, a kind of manufacture method of photonic crystal magneto-optic circulators is provided, described manufacture method comprises the steps:
Step 1: the operation wavelength λ of given photonic crystal magneto-optic circulators, choose the two dimension first dielectric material post structure photonic crystal that tetragonal lattice is arranged, the radius of the first dielectric material post guarantees that operation wavelength is in the photonic crystal band scope, is r1/ λ=0.07 as the radius of the first dielectric material post and the ratio of operation wavelength;
Step 2: in described photonic crystal, remove a row and the row first dielectric material post and constitute horizontal photon crystal wave-guide and longitudinal photon crystal waveguide, and horizontal photon crystal wave-guide and the cross connection of the longitudinal photon crystal waveguide formation photon crystal wave-guide of arranging, one second dielectric material post formation leaded light post is introduced in horizontal photon crystal wave-guide and longitudinal photon crystal waveguide intersection point junction at photon crystal wave-guide, at the described second dielectric material post left, the below is introduced an identical magneto-optic memory technique post respectively with right-hand three the most contiguous crystallographic site places, remove first the most contiguous above the described second dielectric material post dielectric material post and introduce one with the identical magneto-optic memory technique post of described three magneto-optic memory technique posts;
Further improvement as manufacture method of the present invention further comprises step 3: remove the first dielectric material post at the second contiguous crystallographic site place, described second dielectric material post top, constitute a point defect air chamber.
As the further improvement of manufacture method of the present invention, described manufacture method also comprise the steps: the described second dielectric material post left, below introduce the 3rd an identical dielectric material post respectively with right-hand second three contiguous crystallographic site places.
As the further improvement of manufacture method of the present invention, described manufacture method also comprise the steps: the described second dielectric material post left, below, right-hand with above second four contiguous crystallographic site places introduce the 3rd an identical dielectric material post respectively.
As the further improvement of manufacture method of the present invention, the radius of the first dielectric material post and the ratio of operation wavelength are r
1/ λ=0.07.
As the further improvement of manufacture method of the present invention, by adjusting the radius r of the described second dielectric material post
2, the magneto-optic memory technique post radius r
mRadius r with the 3rd dielectric material post
3Regulate the work efficiency that magneto-optic circulators obtains under operation wavelength λ, the dimensional parameters of described work efficiency is that the radius of the radius of the second dielectric material post, magneto-optic memory technique post and the radius of the 3rd dielectric material post and the ratio of operation wavelength are respectively r
2/ λ=0.125, r
m/ λ=0.09 and r
3/ λ=0.02.
Useful technique effect of the present invention is: 1. the photonic crystal magneto-optic circulators of design air-substrate dielectric rod structure (tetragonal lattice arrangement), can realize that effectively coupling is with integrated with the photonic crystal logic element of present broad research.2. adopt the coupled structure characteristic of magneto-optic memory technique post, obtain that form is simple and clear, three ports of compact conformation, four port photonic crystal magneto-optic circulators, the circulator demand of difference in functionality and structure fully is provided for the optimization of photonic crystal logic integrated optical circuit.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the structural representation of the "T"-shaped photonic crystal magneto-optic circulators of the present invention, wherein, "T"-shaped photonic crystal magneto-optic circulators for the second dielectric material post left, below and right-hand second three contiguous crystallographic site places introduce the structural representation of the 3rd dielectric material post.
Fig. 2 is the structural representation of the "T"-shaped photonic crystal magneto-optic circulators of the present invention, wherein, "T"-shaped photonic crystal magneto-optic circulators for the second dielectric material post left, below and right-hand second three contiguous crystallographic site places do not introduce the structural representation of the 3rd dielectric material post.
Fig. 3 is the spectrum synoptic diagram of the "T"-shaped photonic crystal magneto-optic circulators of the present invention, port one 1 is the light incident side mouth, the luminous power ratio of the corresponding port 12 of solid line and port one 1 incident, the luminous power ratio of the corresponding port 13 of dotted line and port one 1 incident, the luminous power ratio of corresponding light reflection of dotted line and loss summation and port one 1 incident.
Fig. 4 is the spectrum synoptic diagram of the "T"-shaped photonic crystal magneto-optic circulators of the present invention, port one 2 is the light incident side mouth, the luminous power ratio of the corresponding port 13 of solid line and port one 2 incidents, the luminous power ratio of the corresponding port 11 of dotted line and port one 2 incidents, the luminous power ratio of corresponding light reflection of dotted line and loss summation and port one 2 incidents.
Fig. 5 is the spectrum synoptic diagram of the "T"-shaped photonic crystal magneto-optic circulators of the present invention, port one 3 is the light incident side mouth, the luminous power ratio of the corresponding port 11 of solid line and port one 3 incidents, the luminous power ratio of the corresponding port 12 of dotted line and port one 3 incidents, the luminous power ratio of corresponding light reflected optical power of dotted line and loss summation and port one 3 incidents.
Fig. 6 is the light transmission synoptic diagram of the "T"-shaped photonic crystal magneto-optic circulators of the present invention, and wherein, port one 1 is the incident port, and port one 2 is an exit ports, and port one 3 is an isolated port.
Fig. 7 is the light transmission synoptic diagram of the "T"-shaped photonic crystal magneto-optic circulators of the present invention, and wherein, port one 2 is the incident port, and port one 3 is an exit ports, and port one 1 is an isolated port.
Fig. 8 is the light transmission synoptic diagram of the "T"-shaped photonic crystal magneto-optic circulators of the present invention, and wherein, port one 3 is the incident port, and port one 1 is an exit ports, and port one 2 is an isolated port.
Fig. 9 is the structural representation of the present invention " ten " font photonic crystal magneto-optic circulators, wherein, " ten " font photonic crystal magneto-optic circulators is for introducing the structural representation of identical the 3rd a dielectric material post respectively at the second dielectric material post, second four contiguous crystallographic site places.
Figure 10 is the structural representation of the present invention " ten " font photonic crystal magneto-optic circulators, wherein, " ten " font photonic crystal magneto-optic circulators is not for introducing the structural representation of the 3rd dielectric material post at the second dielectric material post, second four contiguous crystallographic site places.
Figure 11 is the spectrum synoptic diagram of the present invention " ten " font photonic crystal magneto-optic circulators, port 21 is the light incident side mouth, the luminous power ratio of the corresponding port 22 of solid line and port 21 incidents, the luminous power ratio of the corresponding port 23 of dotted line and port 21 incidents, the luminous power ratio of the corresponding port 24 of dotted line and port 21 incidents, the luminous power ratio of corresponding light reflection of point-dotted line and loss summation and port 21 incidents.
Figure 12 is the light transmission synoptic diagram of the present invention " ten " font photonic crystal magneto-optic circulators, and wherein, port 21 is the incident port, and port 22 is an exit ports, and port 23 and port 24 are isolated port.
Figure 13 is the light transmission synoptic diagram of the present invention " ten " font photonic crystal magneto-optic circulators, and wherein, port 22 is the incident port, and port 23 is an exit ports, and port 21 and port 24 are isolated port.
Figure 14 is the light transmission synoptic diagram of the present invention " ten " font photonic crystal magneto-optic circulators, and wherein, port 23 is the incident port, and port 24 is an exit ports, and port 21 and port 22 are isolated port.
Figure 15 is the light transmission synoptic diagram of the present invention " ten " font photonic crystal magneto-optic circulators, and wherein, port 24 is the incident port, and port 21 is an exit ports, and port 22 and port 23 are isolated port.
Embodiment
The present invention is applied in the photonic crystal by the optically-active characteristic with magneto-optic memory technique, design that form is simple and clear, "T"-shaped three ports of compact conformation, " ten " font four port photonic crystal magneto-optic circulators, realize the transmission of going in ring of single directional light between three ports, four ports respectively.
As shown in Figure 1, the structural model of "T"-shaped three port photonic crystal magneto-optic circulators of the present invention.Described photonic crystal is made of the first dielectric material post of two dimension in the air background, it comprises a "T"-shaped photon crystal wave-guide, also comprises four same magnetic finish stock columns, the 3rd dielectric material post that the point defect air chamber is identical with three of being positioned at second dielectric material post "T"-shaped photon crystal wave-guide intersection point junction and that play the leaded light effect and the contiguous second dielectric material post.
Can introduce or not introduce the 3rd dielectric material post in the described "T"-shaped photonic crystal magneto-optic circulators, the structural model of not introducing the 3rd dielectric material post as shown in Figure 2, its prioritization scheme is to introduce the 3rd dielectric material post.
Below be embodiment to introduce the 3rd dielectric material post.
Specific as follows, described photonic crystal is to be made of the arrange first dielectric material post 01 of (11 * 11 lattice array) of two-dimentional tetragonal lattice in the air background, each first dielectric material post 01 occupies a lattice of lattice array, horizontal or vertical distance at the center of adjacent two first dielectric material posts 01 arbitrarily is a grating constant, in the mark lattice array lattice at the capable n column position of m place be (m, n).The grating constant a of described photonic crystal is chosen for 11.25mm, and the radius of the described first dielectric material post 01 is r
1=2.1mm, its material is chosen as silicon materials, and refractive index is 3.4.In described photonic crystal, remove lattice (6,1), (6,2), (6,3), (6,4), (6,5), (6,6), (6,7), (6,8), (6,9), (6,10) and the first dielectric material post 01 of (6,11) position constitute a horizontal photon crystal wave-guide, remove lattice (7 again, 6), (8,6), (9,6), (10,6) and (11,6) the first dielectric material post 01 of position constitutes a longitudinal photon crystal waveguide, and above-mentioned horizontal photon crystal wave-guide and longitudinal photon crystal waveguide are "T"-shaped arranging and constitute a "T"-shaped photon crystal wave-guide.
Lattice in described photonic crystal (6,6) position, promptly one second dielectric material post 02 is introduced in the horizontal photon crystal wave-guide of "T"-shaped photon crystal wave-guide and longitudinal photon crystal waveguide intersection point junction, promptly constitutes photonic crystal leaded light post.The material of the described second dielectric material post 02 is chosen as silicon materials, and refractive index is 3.4.Three lattices (6,5), (7,6) and (6,7) position in described photonic crystal, promptly the second dielectric material post, 02 left, below and the most contiguous right-hand lattice place introduce a same magnetic finish stock column A, B and C respectively.Lattice in described photonic crystal (5,6) position, promptly the most contiguous lattice place removes the first dielectric material post 01 above the second dielectric material post 02, and introduces a magneto-optic memory technique post D same as described above.The material of described magneto-optic memory technique post A, B, C and D is chosen as Ferrite Material, and specific inductive capacity is 12.9, and the magnetic permeability tensor is
K=-8.48 wherein, μ=-7, the externally-applied magnetic field direction that is applied to four magneto-optic memory technique posts is the axis direction along the magneto-optic memory technique post.
Lattice in described photonic crystal (4,6) position, promptly the second contiguous crystallographic site place removes the first dielectric material post 01 above the described second dielectric material post 02, constitutes a point defect air chamber 04.
Three lattices (6,4), (8,6) and (6,8) position in described photonic crystal, promptly the second dielectric material post, 02 left, below and the right-hand second contiguous lattice place introduce identical the 3rd a dielectric material post 03 respectively.The material of described the 3rd dielectric material post 03 is chosen as silicon materials, and refractive index is 3.4.
Described "T"-shaped photonic crystal magneto-optic circulators comprises three ports, i.e. first port one 1, second port one 2 and the 3rd port one 3.
Further, structural parameters to described "T"-shaped photonic crystal circulator are optimized: light is set from 1 incident of first port one, at second port one 2 and the 3rd port one 3 the transmittance power that the photodetection point obtains the corresponding port is set respectively, and the light reflective power that the photodetection point obtains this port is set at first port one 1.By optimizing the radius of the described second dielectric material post 02, magneto-optic memory technique post and the 3rd dielectric material post 03, the spectrogram that obtains "T"-shaped photonic crystal circulator optimum working efficiency as shown in Figure 3.In Fig. 3, solid line and dotted line are represented the luminous power ratio of second port one 2 and the 3rd port one 3 and 1 incident of first port one under the different frequency respectively, and dotted line is represented the luminous power ratio of light reflection and loss summation and 1 incident of first port one.Fig. 3 shows, the frequency optimum traffic of this "T"-shaped photonic crystal circulator is 10GHz (operation wavelength λ=30mm), the luminous power of second port one 2 and 1 incident of first port one is than being-0.223dB, the luminous power ratio of the 3rd port one 3 and 1 incident of first port one is-18.2dB that light reflection and loss summation are-14.6dB with the luminous power ratio of first port one, 1 incident.Correspondingly, the radius r of the second dielectric material post 02 of optimization
2, the magneto-optic memory technique post radius r
mRadius r with the 3rd dielectric material post 03
3Be respectively r
2/ λ=0.125, r
m/ λ=0.09 and r
3/ λ=0.02.
Light is set from 2 incidents of second port one, at the 3rd port one 3 and first port one 1 the transmittance power that the photodetection point obtains the corresponding port is set respectively, and the light reflective power that the photodetection point obtains this port is set at second port one 2.Under the structural parameters of the second dielectric material post 02, magneto-optic memory technique post and the 3rd dielectric material post 03 of above-mentioned optimization, the spectrogram that obtains "T"-shaped photonic crystal circulator optimum working efficiency as shown in Figure 4.In Fig. 4, solid line and dotted line are represented the luminous power ratio of the 3rd port one 3 and first port one 1 and 2 incidents of second port one under the different frequency respectively, and dotted line is represented the luminous power ratio of light reflection and loss summation and 2 incidents of second port one.Fig. 4 shows, the frequency optimum traffic of this "T"-shaped photonic crystal circulator is 10GHz, the luminous power of the 3rd port one 3 and 2 incidents of second port one is than being-0.223dB, the luminous power ratio of first port one 1 and 2 incidents of second port one is-30dB that light reflection and loss summation are-13.1dB with the luminous power ratio of second port one, 2 incidents.
Light is set from 3 incidents of the 3rd port one, at first port one 1 and second port one 2 the transmittance power that the photodetection point obtains the corresponding port is set respectively, and the light reflective power that the photodetection point obtains this port is set at the 3rd port one 3.Under the structural parameters of the second dielectric material post 02, magneto-optic memory technique post and the 3rd dielectric material post 03 of above-mentioned optimization, the spectrogram that obtains "T"-shaped photonic crystal circulator optimum working efficiency as shown in Figure 5.In Fig. 5, solid line and dotted line are represented the luminous power ratio of first port one 1 and second port one 2 and 3 incidents of the 3rd port one under the different frequency respectively, and dotted line is represented the luminous power ratio of light reflection and loss summation and 3 incidents of the 3rd port one.Fig. 5 shows, the frequency optimum traffic of this "T"-shaped photonic crystal circulator is 10GHz, the luminous power of first port one 1 and 3 incidents of the 3rd port one is than being-0.177dB, the luminous power ratio of second port one 2 and 3 incidents of the 3rd port one is-23.0dB that light reflection and loss summation are-14.6dB with the luminous power ratio of the 3rd port one 3 incidents.
Serviceability according to the "T"-shaped photonic crystal circulator of above-mentioned optimization product test:
With reference to Fig. 6, frequency is that the light of 10GHz is from 1 incident of first port one, last light is exported from second port one 2 through an angle of 90 degrees rotation back, the luminous power of second port one 2 and 1 incident of first port one is than being-0.223dB, lattice (6 in the photonic crystal wherein, 5) and two magneto-optic memory technique post A of (7,6) position and B respectively light is realized the miter angle rotation.The 3rd port one 3 is in the light isolation, and its luminous power ratio with 1 incident of first port one is-18.2dB.Correspondingly, light reflection and loss summation with the luminous power ratio of first port one, 1 incident are-14.6dB.
With reference to Fig. 7, frequency is that the light of 10GHz is from 2 incidents of second port one, last light is exported from the 3rd port one 3 through an angle of 90 degrees rotation back, the luminous power of the 3rd port one 3 and 2 incidents of second port one is than being-0.223dB, lattice (7 in the photonic crystal wherein, 6) and two magneto-optic memory technique post B of (6,7) position and C respectively light is realized the miter angle rotation.First port one 1 is in the light isolation, and its luminous power ratio with 2 incidents of second port one is-30dB.Correspondingly, light reflection and loss summation with the luminous power ratio of second port one, 2 incidents are-13.1dB.
With reference to Fig. 8, frequency is that the light of 10GHz is from 3 incidents of the 3rd port one, lattice (6 in the photonic crystal, 7) and (5,6) two of the position magneto-optic memory technique post C and D upload to photonic crystal point defect air chamber 04 with light, lattice (5 then, 6) and (6,5) two of the position magneto-optic memory technique post D and A download light from photonic crystal point defect air chamber 04, at last from 1 output of first port one, the luminous power of first port one 1 and 3 incidents of the 3rd port one compares, and wherein second port one 2 is in the light isolation, and its luminous power ratio with 3 incidents of the 3rd port one is-23.0dB.Correspondingly, light reflection and loss summation with the luminous power ratio of the 3rd port one 3 incidents are-14.6dB.
This "T"-shaped photonic crystal magneto-optic circulators realizes the belt transmission of the single directional light between three ports, and promptly the light from any port input can be according to same sense of rotation from adjacent next port output in three ports.
The structural model of " ten " of the present invention font four port photonic crystal magneto-optic circulators as shown in Figure 9, described photonic crystal is made of the first dielectric material post of two dimension in the air background, it comprises one " ten " font photon crystal wave-guide, is positioned at the second dielectric material post that plaing of " ten " font photon crystal wave-guide intersection point junction do the leaded light effect and identical the 3rd dielectric material post with four of four same magnetic finish stock columns of the contiguous second dielectric material post.
Can introduce or not introduce the 3rd dielectric material post in above-mentioned " ten " font photonic crystal magneto-optic circulators, the structural model of not introducing the 3rd dielectric material post as shown in figure 10, its prioritization scheme is to introduce the 3rd dielectric material post.
Below be embodiment to introduce the 3rd dielectric material post.
Specific as follows, described photonic crystal is to be made of the arrange first dielectric material post 01 of (11 * 11 lattice array) of two-dimentional tetragonal lattice in the air background, each first dielectric material post 01 occupies a lattice of lattice array, horizontal or vertical distance at the center of adjacent two first dielectric material posts 01 arbitrarily is a grating constant, in the mark lattice array lattice at the capable n column position of m place be (m, n).The grating constant of described photonic crystal is chosen for 11.25mm, and the radius of the described first dielectric material post 01 is r
1=2.1mm, its material is chosen as silicon materials, and refractive index is 3.4.In described photonic crystal, remove lattice (6,1), (6,2), (6,3), (6,4), (6,5), (6,6), (6,7), (6,8), (6,9), the first dielectric material post 01 of (6,10) and (6,11) position constitutes a horizontal photon crystal wave-guide, remove lattice (1 then, 6), (2,6), (3,6), (4,6), (5,6), (7,6), (8,6), (9,6), (10,6) and the first dielectric material post 01 of (11,6) position constitute a longitudinal photon crystal waveguide, described horizontal photon crystal wave-guide and longitudinal photon crystal waveguide are " ten " font and arrange and constitute one " ten " font photon crystal wave-guide.
Lattice in described photonic crystal (6,6) position, promptly one second dielectric material post 02 is introduced in the horizontal photon crystal wave-guide of " ten " font photon crystal wave-guide and longitudinal photon crystal waveguide intersection point junction, promptly constitutes photonic crystal leaded light post.The material of the described second dielectric material post 02 is chosen as silicon materials, and refractive index is 3.4.Four lattices (6,5), (7,6), (6,7) and (5,6) in photonic crystal, promptly the second dielectric material post, 02 four the most contiguous crystallographic site places introduce a same magnetic finish stock column E, F, G and H respectively.The material of described magneto-optic memory technique post E, F, G and H is chosen as Ferrite Material, and specific inductive capacity is 12.9, and the magnetic permeability tensor is
K=-8.48 wherein, μ=-7, the externally-applied magnetic field direction that is applied to four magneto-optic memory technique posts is the axis direction along the magneto-optic memory technique post.
Four lattices (6,4), (8,6), (6,8) and (4,6) position in above-mentioned photonic crystal, promptly the second dielectric material post, 02 second contiguous lattice place introduces identical the 3rd a dielectric material post 03 respectively.The material of described the 3rd dielectric material post 03 is chosen as silicon materials, and refractive index is 3.4.
Above-mentioned " ten " font photonic crystal magneto-optic circulators comprises four ports, i.e. first port 21, second port 22, the 3rd port 23 and the 4th port 24.
Further, structural parameters to described " ten " font photonic crystal circulator are optimized: light is set from 21 incidents of first port, at second port 22, the 3rd port 23 and the 4th port 24 the transmittance power that the photodetection point obtains the corresponding port is set respectively, and the light reflective power that the photodetection point obtains this port is set at first port 21.By optimizing the radius of the described second dielectric material post 02, magneto-optic memory technique post and the 3rd dielectric material post 03, the spectrogram of acquisition " ten " font photonic crystal circulator optimum working efficiency as shown in figure 11.In Figure 11, solid line, dotted line and dotted line are represented the luminous power ratio of second port 22, the 3rd port 23 and the 4th port 24 and 21 incidents of first port under the different frequency respectively, and point-dotted line is represented the luminous power ratio of light reflection and loss summation and 21 incidents of first port.Figure 11 shows, frequency optimum traffic that should " ten " font photonic crystal circulator is 10GHz (operation wavelength λ=30mm), the luminous power ratio of second port 22, the 3rd port 23 and the 4th port 24 and 21 incidents of first port is respectively-0.223dB ,-18.2dB and-30dB, the luminous power of light reflection and loss summation and 21 incidents of first port is than being-14.7dB.Correspondingly, correspondingly, the radius r of the second dielectric material post 02 of optimization
2, the magneto-optic memory technique post radius r
mRadius r with the 3rd dielectric material post 03
3Be respectively r
2/ λ=0.125, r
m/ λ=0.09 and r
3/ λ=0.02.Because the structure rotational symmetry of " ten " font photonic crystal circulator, the structural parameters that above-mentioned optimization obtains are suitable equally from the situation of second port 22 or the 3rd port 23 or 24 incidents of the 4th port for light.
Serviceability according to above-mentioned optimization product test " ten " font photonic crystal circulator:
With reference to Figure 12, frequency is that the light of 10GHz is from 21 incidents of first port, last light is exported from second port 22 through an angle of 90 degrees rotation back, the luminous power of second port 22 and 21 incidents of first port is than being-0.223dB, lattice (6 in the photonic crystal wherein, 5) and two magneto-optic memory technique post E of (7,6) position and F respectively light is realized the miter angle rotation.The 3rd port 23 and the 4th port 24 are in the light isolation, its luminous power ratio with 21 incidents of first port is respectively-18.2dB and-30dB.Correspondingly, light reflection and loss summation with the luminous power ratio of first port, 21 incidents are-14.7dB.
With reference to Figure 13, frequency is that the light of 10GHz is from 22 incidents of second port, last light is exported from the 3rd port 23 through an angle of 90 degrees rotation back, the luminous power of the 3rd port 23 and 22 incidents of second port is than being-0.223dB, lattice (7 in the photonic crystal wherein, 6) and two magneto-optic memory technique post F of (6,7) position and G respectively light is realized the miter angle rotation.The 4th port 24 and first port 21 are in the light isolation, its luminous power ratio with 22 incidents of second port is respectively-18.2dB and-30dB.Correspondingly, light reflection and loss summation with the luminous power ratio of second port, 22 incidents are-14.7dB.
With reference to Figure 14, frequency is that the light of 10GHz is from 23 incidents of the 3rd port, last light is exported from the 4th port 24 through an angle of 90 degrees rotation back, the luminous power of the 4th port 24 and 23 incidents of the 3rd port is than being-0.223dB, lattice (6 in the photonic crystal wherein, 7) and two magneto-optic memory technique post G of (5,6) position and H respectively light is realized the miter angle rotation.First port 21 and second port 22 are in the light isolation, its luminous power ratio with 23 incidents of the 3rd port is respectively-18.2dB and-30dB.Correspondingly, light reflection and loss summation with the luminous power ratio of the 3rd port 23 incidents are-14.7dB.
With reference to Figure 15, frequency is that the light of 10GHz is from 24 incidents of the 4th port, last light is exported from first port 21 through an angle of 90 degrees rotation back, the luminous power of first port 21 and 24 incidents of the 4th port is than being-0.223dB, lattice (5 in the photonic crystal wherein, 6) and two magneto-optic memory technique post H of (6,5) position and E respectively light is realized the miter angle rotation.Second port 22 and the 3rd port 23 are in the light isolation, its luminous power ratio with 24 incidents of the 4th port is respectively-18.2dB and-30dB.Correspondingly, light reflection and loss summation with the luminous power ratio of the 4th port 24 incidents are-14.7dB.
Should " ten " font photonic crystal magneto-optic circulators realize the transmission of going in ring of single directional light between four ports, promptly the light from any port input can be according to same sense of rotation from adjacent next port output in four ports.
It is described that photonic crystal three-port circulator of the present invention is not limited to above-mentioned embodiment, as those skilled in the art according to disclosed technical scheme, and according to photonic crystal equal proportion convergent-divergent principle, be the operation wavelength and the photonic crystal lattice constant of circulator, in the photonic crystal first is to the size of the 3rd dielectric material post, and the isoparametric relation of the size of magneto-optic memory technique post satisfies proportional relation, photonic crystal magneto-optic circulators of the present invention is applicable to any electromagnetic wave bands, as microwave region, millimeter wave band, terahertz wave band, infrared band or visible light wave range etc.
Useful technique effect of the present invention is: 1. the photonic crystal magneto-optic circulators of design air substrate-medium rod structure (tetragonal lattice arrangement), can realize that effectively coupling is with integrated with the photonic crystal logic element of present broad research.2. adopt the coupled structure characteristic of magneto-optic memory technique post, obtain that form is simple and clear, three ports of compact conformation, four port photonic crystal magneto-optic circulators, the circulator demand of difference in functionality, structure fully is provided for the optimization of photonic crystal logic integrated optical circuit.
Circulator of the present invention has that form is simple and clear, the characteristics of compact conformation, can realize coupling with the air substrate-medium post photonic crystal logic element of present broad research, can be used as the anti-interference element in the complex photonic crystal integrated optical circuit, effectively reach the purpose of stable optic path, raising light path integrated level.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (15)
1. photonic crystal magneto-optic circulators, it comprises the first dielectric material post in the air background, the first dielectric material post in the described photonic crystal is two-dimentional tetragonal lattice and arranges, each first dielectric material post occupies a lattice of tetragonal lattice, horizontal or vertical distance at the center of adjacent two first dielectric material posts arbitrarily is a grating constant, and it is characterized in that: described photonic crystal magneto-optic circulators also comprises:
One photon crystal wave-guide, described photon crystal wave-guide comprise cross-coupled horizontal photon crystal wave-guide and longitudinal photon crystal waveguide mutually;
One is positioned at the second dielectric material post described horizontal photon crystal wave-guide and cross connection place of longitudinal photon crystal waveguide and that play the leaded light effect;
Four identical evenly is arranged on magneto-optic memory technique post around the second dielectric material post;
And at least three the 3rd identical dielectric material posts, described the 3rd dielectric material post is separately positioned on the outside of described three magneto-optic memory technique posts.
2. photonic crystal magneto-optic circulators as claimed in claim 1, it is characterized in that: described cross-coupled horizontal photon crystal wave-guide mutually and longitudinal photon crystal waveguide are formed "T"-shaped photon crystal wave-guide, described "T"-shaped photon crystal wave-guide comprises three ports, the 3rd a dielectric material post that is positioned at the outside of described magneto-optic memory technique post all is set on each port direction, a point defect air chamber is arranged in the arranged outside of the 4th magneto-optic memory technique post.
3. photonic crystal magneto-optic circulators as claimed in claim 1, it is characterized in that: described cross-coupled horizontal photon crystal wave-guide mutually and longitudinal photon crystal waveguide are formed " ten " font photon crystal wave-guide, described " ten " font photon crystal wave-guide comprises four ports, and the 3rd a dielectric material post that is positioned at the outside of described magneto-optic memory technique post all is set on each port direction.
4. photonic crystal magneto-optic circulators as claimed in claim 1, it is characterized in that: the described first dielectric material post, the second dielectric material post and the 3rd dielectric material post are silicon materials, refractive index is 3.4, the radius size difference of the described first dielectric material post, the second dielectric material post and the 3rd dielectric material post.
5. photonic crystal magneto-optic circulators as claimed in claim 2, it is characterized in that: described horizontal photon crystal wave-guide and longitudinal photon crystal waveguide constitute by removing a row and the row first dielectric material post in the described photonic crystal, wherein, the length of the horizontal photon crystal wave-guide of described "T"-shaped photon crystal wave-guide is na, the length of longitudinal photon crystal waveguide is (n-1) a/2, a is the grating constant of photonic crystal, and described n is 9 or 11 or 13 or 15.
6. photonic crystal magneto-optic circulators as claimed in claim 3, it is characterized in that: described horizontal photon crystal wave-guide and longitudinal photon crystal waveguide constitute by removing a row and the row first dielectric material post in the described photonic crystal, wherein, the horizontal photon crystal wave-guide of described " ten " font photon crystal wave-guide and the length of longitudinal photon crystal waveguide are na, a is the grating constant of photonic crystal, and described n is 9 or 11 or 13 or 15.
7. photonic crystal magneto-optic circulators as claimed in claim 1, it is characterized in that: described four magneto-optic memory technique posts are distributed in four the most contiguous crystallographic site places of the described second dielectric material post, and the distance at the center of the center of each magneto-optic memory technique post and the second dielectric material post is a grating constant.
8. photonic crystal magneto-optic circulators as claimed in claim 2 is characterized in that: described point defect air chamber is made of the first dielectric material post at the crystallographic site place that removes described second dielectric material post top second vicinity.
9. photonic crystal magneto-optic circulators as claimed in claim 2, it is characterized in that: described three the 3rd dielectric material posts are distributed in the described second dielectric material post left, below and right-hand second three contiguous crystallographic site places, and the distance at the center of the center of each the 3rd dielectric material post and the second dielectric material post is two grating constants.
10. photonic crystal magneto-optic circulators as claimed in claim 3, it is characterized in that: described four the 3rd dielectric material posts are distributed in four crystallographic site places of second vicinity of the described second dielectric material post, and the distance at the center of the center of each the 3rd dielectric material post and the second dielectric material post is two grating constants.
11. the manufacture method of a photonic crystal magneto-optic circulators is characterized in that: described manufacture method comprises the steps:
Step 1: the operation wavelength λ of given photonic crystal magneto-optic circulators, choose the two dimension first dielectric material post structure photonic crystal that tetragonal lattice is arranged, the radius of the first dielectric material post guarantees that operation wavelength is in the photonic crystal band scope;
Step 2: in described photonic crystal, remove a row and the row first dielectric material post and constitute horizontal photon crystal wave-guide and longitudinal photon crystal waveguide, and horizontal photon crystal wave-guide and the cross connection of longitudinal photon crystal waveguide are arranged, one second dielectric material post formation leaded light post is introduced in horizontal photon crystal wave-guide and longitudinal photon crystal waveguide intersection point junction at photon crystal wave-guide, at the described second dielectric material post left, the below is introduced an identical magneto-optic memory technique post respectively with right-hand three the most contiguous crystallographic site places, remove first the most contiguous above the described second dielectric material post dielectric material post and introduce one with the identical magneto-optic memory technique post of described three magneto-optic memory technique posts.
12. the manufacture method of photonic crystal magneto-optic circulators as claimed in claim 11, it is characterized in that: further comprise step 3: remove the first dielectric material post at the second contiguous crystallographic site place, described second dielectric material post top, constitute a point defect air chamber; The described second dielectric material post left, below introduce the 3rd an identical dielectric material post respectively with right-hand second three contiguous crystallographic site places.
13. the manufacture method of photonic crystal magneto-optic circulators as claimed in claim 11 is characterized in that: described manufacture method also comprise the steps: the described second dielectric material post left, below, right-hand with above second four contiguous crystallographic site places introduce the 3rd an identical dielectric material post respectively.
14. the manufacture method of photonic crystal magneto-optic circulators as claimed in claim 11 is characterized in that: the radius of the first dielectric material post and the ratio of operation wavelength are r
1/ λ=0.07.
15. the manufacture method as claim 12 or 13 described photonic crystal magneto-optic circulators is characterized in that: by adjusting the radius r of the described second dielectric material post
2, the magneto-optic memory technique post radius r
mRadius r with the 3rd dielectric material post
3Regulate the work efficiency that magneto-optic circulators obtains under operation wavelength λ, the dimensional parameters of described work efficiency is that the radius of the radius of the second dielectric material post, magneto-optic memory technique post and the radius of the 3rd dielectric material post and the ratio of operation wavelength are respectively r
2/ λ=0.125, r
m/ λ=0.09 and r
3/ λ=0.02.
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| US13/504,559 US8731360B2 (en) | 2010-11-12 | 2010-11-29 | Photonic crystal magneto-optical circulator and manufacturing method thereof |
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| CN105572919A (en) * | 2016-02-15 | 2016-05-11 | 欧阳征标 | Magneto-optical modulator based on photonic crystal cross waveguide |
| CN105572919B (en) * | 2016-02-15 | 2021-02-19 | 深圳大学 | Magneto-optical modulator based on photonic crystal cross waveguide |
| CN107908021A (en) * | 2017-11-27 | 2018-04-13 | 深圳大学 | T font photonic crystal circulators based on photonic crystal waveguide |
| CN108333678A (en) * | 2017-12-12 | 2018-07-27 | 西南科技大学 | Magnetic control cavity switches type ROADM based on 2 D photon crystal |
| CN109976002A (en) * | 2019-03-25 | 2019-07-05 | 南京邮电大学 | One kind is based on mixing Bi rare-earth iron garnet magnetic control photon crystal filter |
| CN112526775A (en) * | 2020-12-25 | 2021-03-19 | 深圳大学 | Polarization-independent photonic crystal circulator based on magneto-optical material |
| CN112526775B (en) * | 2020-12-25 | 2022-07-12 | 深圳大学 | Polarization-independent photonic crystal circulator based on magneto-optical material |
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