CN115343892B - Multifunctional full-dielectric topological waveguide dynamic switch capable of being coded - Google Patents
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- G02F1/3138—Digital deflection, i.e. optical switching in an optical waveguide structure with intersecting or branching waveguides, e.g. X-switches and Y-junctions the optical waveguides being made of semiconducting materials
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Abstract
The invention provides a multifunctional all-dielectric topological waveguide state switch capable of being coded, which comprises a non-plain topological area and a plain topological area; the non-plain topological area and the plain topological area are crossly arranged to form a waveguide transmission interface I and a waveguide transmission interface II; the waveguide transmission interface I is provided with a polarization source I, the waveguide transmission interface II is provided with a polarization source III and a polarization source IV, the waveguide transmission interface I and the waveguide transmission interface II are provided with a polarization source III and a polarization source IV on an included angle bisector, and the intersection center of the waveguide transmission interface I and the waveguide transmission interface II is provided with a polarization source V. The invention realizes multifunctional waveguide transmission, solves the problems of simplification, incoordination and the like of the functions of the traditional photonic waveguide device, enriches the functions of waveguide state switches and widens the application scene of the invention.
Description
Technical Field
The invention relates to the field of topological photonics, quantum communication and integrated photonic optical circuits, in particular to a multifunctional full-dielectric topological spiral one-way boundary state switch capable of being coded.
Background
The photonic device based on the all-dielectric topological waveguide has immeasurable application prospect in the fields of topological photonics, quantum communication and integrated photonic optical paths. At present, with the advent of the 6G era, the demand for optical communication systems, especially for all-optical network communication, is increasing. Integrated photonic optical circuits are continuously moving towards high capacity, high efficiency, and miniaturization. Therefore, low-cost, high-efficiency, multifunctional micro-optical devices are continuously researched and developed.
In 2008, the Zheng Wang group of MIT in the united States designed a single-direction boundary waveguide transmission mode (Reflection-Free One-Way Edge Modes in a Gyromagnetic Photonic Crystal) constructed based on Gyromagnetic materials, and observed a single-direction boundary transmission waveguide mode (emission of uniform Backscattering-immunity Electromagnetic States) that resists Backscattering for the first time in the laboratory in 2009. Waveguide optical devices constructed based on magneto-optical photonic crystals, such as optical isolators, optical couplers, waveguide splitters, optical storage devices, etc., have been developed since then. However, the magneto-optical effect is weak in the optical band, and the system needs to be controlled by an external strong magnetic field.
In 2016, a Topological Photonic Crystal structure model (Scheme for improving a Photonic Crystal structure by Using a digital Material) is constructed by the Hudao professor of the university of Seikagaku, japan, based on all-Dielectric materials, and a propagation mode of a one-way helical boundary state is realized. Subsequently, they observed in the laboratory in 2018 a Unidirectional helical boundary state protected by Topological pseudo-spin (Visualization of a Unidirectional Electromagnetic wave guide Using Topological Photonic Crystals Made of Dielectric Materials). The pseudospin state protected by topology has excellent propagation characteristics of robustness, defect immunity, interference resistance and the like, so that the pseudospin state protected by topology is widely applied to research, development and preparation of all-dielectric waveguide photonic devices.
In 2018, the Xia group of Jiangsu university college of academic institute, yongsu, constructed an encodable Topological Insulator (Programmable Coding Acoustic polar Insulator) that controlled waveguide transmission by external Coding to achieve a multifunctional waveguide transmission effect. The south east university, trekken, iron military, is a famous expert in our country for encoding metamaterials, and in 2021, encodable Three-Dimensional topological surface states (Programmable Three-Dimensional Advanced Materials Based on nanostructual structures as Building Blocks for Flexible Sensors) were experimentally observed.
At present, the research method of waveguide photonic devices for coding photonic crystal structures to realize multifunction, high efficiency and miniaturization breaks through the design method of the traditional photonic crystal waveguide optical devices with single function.
Disclosure of Invention
Aiming at the technical problems of singularity and incompatibility of functions of the traditional optical waveguide device, the invention provides a codeable multifunctional topological spiral one-way boundary state switch constructed based on a full dielectric, and multifunctional waveguide transmission is realized by simply coding the position and the polarization direction of a chiral polarizer.
In order to achieve the purpose, the technical scheme of the invention is realized as follows: a multifunctional full-dielectric topological waveguide state switch capable of being coded is characterized in that: including areas of non-mediocre topology and areas of mediocre topology; the non-plain topological area and the plain topological area are staggered to form a waveguide transmission interface I and a waveguide transmission interface II; the waveguide transmission interface I is provided with a polarization source I, the waveguide transmission interface II is provided with a polarization source III and a polarization source IV, an included angle bisector between the waveguide transmission interface I and the waveguide transmission interface II is provided with the polarization source III and the polarization source IV, and the intersection center of the waveguide transmission interface I and the waveguide transmission interface II is provided with the polarization source V.
The end points of the waveguide transmission interface I are respectively provided with a waveguide transmission port A and a waveguide transmission port B, and the end points of the waveguide transmission interface II are respectively provided with a waveguide transmission port C and a waveguide transmission port D; the non-plain topological area is composed of graphene-like lattice plain photonic crystal units, and the non-plain topological area is composed of graphene-like lattice plain photonic crystal units.
The topological graphene non-mediocre photonic lattice unit and the topological mediocre photonic lattice unit are both formed by cylindrical silicon rods; the radius of the cylindrical silicon rod is 0.11a, the height is a, and the refractive index is
a is a graphene-like lattice constant of 1000nm; the refractive index of air at room temperature is 1, and the parameter->
The topological non-trivial photonic lattice unit consists of cylindrical silicon rods and meets the limiting conditions: t is t 1 Is more than 1/3a; the topological peaceful photonic lattice unit consists of cylindrical silicon rods and meets the limiting conditions: t is t 1 < 1/3a, wherein t 1 Representing the distance of the nearest neighbor dielectric pillar between adjacent lattice cells.
Taking the lower left corner of the encodable multifunctional all-dielectric topological waveguide state switch as an origin, setting the coordinates of a starting point and an end point of a waveguide transmission interface I as (0, 9.75L) and (18.5a, 9.75L); the starting point coordinates of the waveguide transmission interface II are (7.5a, 0), the end point coordinates are (13.5a, 18L), and the included angle between the waveguide transmission interface I16 and the waveguide transmission interface II17 is 60 degrees.
The polarization source I, the polarization source II, the polarization source III, the polarization source IV and the polarization source V are chiral sources with circular polarization, and the chiral sources are composed of 4 linear polarization antennas which are arranged in a square shape.
The left lower corner of a structural schematic diagram of the encodable multifunctional all-dielectric topological waveguide state switch is taken as an origin, the coordinates of a polarization source I are (2.5a, 9.75L), the coordinates of a polarization source II are (8.5a, 3L), the coordinates of a polarization source III are (10.6 a, 10.05L), the coordinates of a polarization source IV are (10.4a, 9.45L), the coordinates of a polarization source V at an interface intersection are (10.5 a, 9.75L), the coordinates of a waveguide transmission port A are (0, 9.75L), the coordinates of a waveguide transmission port B are (18.5 a, 9.75L), the coordinates of a waveguide transmission port C are (7.5a, 0), and the coordinates of a waveguide transmission port D are (13.5 a, 18L).
The method for realizing waveguide transmission comprises the following steps: the polarization source I, the polarization source II, the polarization source III, the polarization source IV and the polarization source V at the interface intersection are arranged to be 1, the switch is arranged to be 0, the left rotation is arranged to be 0, the right rotation is arranged to be 1, the waveguide transmission port A, the waveguide transmission port B, the waveguide transmission port C and the waveguide transmission port D are arranged to be 1, and the switch is arranged to be 0, the on and off, the left rotation and the right rotation of the light source at each position are controlled through a single chip microcomputer digital micro circuit, the encoding of the position and the polarization direction of the light source by using an external circuit is realized, the switching conditions of the waveguide transmission port A, the waveguide transmission port B, the waveguide transmission port C and the waveguide transmission port D are obtained, and waveguide photonic devices with different functions are realized.
The invention designs a cross-like waveguide interface transmission system, and finds out the special position points of the waveguide transmission light source of the system. Then the information of the light source is controlled by the digital micro circuit code of the single chip microcomputer, for example, the switch and the polarization direction of a certain point light source are obtained, and finally the switch conditions of 4 ports are obtained. By changing the position of the light source and the polarization direction of the light source, the invention can realize the functions of optical waveguide cross-interface transmission, waveguide beam splitting and multi-channel transmission. The invention can realize the multifunctional conversion of the photonic device in the integrated optical path, enrich the functions of the waveguide state switch and widen the application prospect of quantum optical communication.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 provides an overall structure of a two-dimensional all-dielectric (silicon) topological photonic crystal encodable multifunctional unidirectional spiral boundary state waveguide switch according to an embodiment of the invention.
Fig. 2 shows a three-dimensional structure of a fully dielectric topological photonic crystal and a corresponding first brillouin zone energy band distribution of the topological photonic crystal according to an embodiment of the present invention.
Fig. 2 (a) is a schematic structural diagram of a three-dimensional graphene-like topological photonic crystal of the present invention.
Fig. 2bI is a first brillouin zone topological photonic crystal dispersion band diagram when δ t = -0.1 in the invention.
Fig. 2bII is a dispersion band diagram of the first brillouin zone topological photonic crystal when δ t =0 in the present invention.
Fig. 2bIII is a first brillouin zone topological photonic crystal dispersion band diagram when δ t =0.1 in the present invention.
Fig. 3 is a band diagram of a one-way spiral boundary mode waveguide transmission band in an embodiment of the present invention.
Fig. 4 is a diagram of the distribution of TM mode optical wave transmission electric field at a frequency f =0.4788c/a for polarized source I1 and polarized source II2 in the embodiment of the present invention, where c is the speed of light in vacuum.
Fig. 5 shows TM mode optical transmission electric field profiles and corresponding poynting vectors for polarized source III3 and polarized source IV4 at a frequency f =0.4788c/a in accordance with an embodiment of the present invention.
Fig. 6 (a) shows a distribution diagram of TM mode optical wave transmission electric field and corresponding normalized electric field intensity of waveguide transmission at waveguide transmission interface I and waveguide transmission interface II when the polarized source V5 is at a frequency f =0.4788c/a according to an embodiment of the present invention.
Fig. 6 (b) is the normalized electric field intensity of the waveguide at waveguide transmission interface I and waveguide transmission interface II.
Table 1 shows the waveguide switching conditions of the polarized source I and the polarized source II in the embodiment of the present invention for all ports a, B, C, and D when the frequency f = 0.4788C/a.
Table 2 shows the waveguide switching of all ports a, B, C, D for the polarized source III and the polarized source IV of the present embodiment with frequency f = 0.4788C/a.
Table 3 shows the waveguide switching of all ports a, B, C, D for the case of the present invention with a polarized source V and a frequency f = 0.4788C/a.
Names of components corresponding to corresponding reference numerals in the drawings are: the optical waveguide comprises a polarization source I1, a polarization source II2, a polarization source III3, a polarization source IV4, a polarization source V at the intersection center of the interfaces 5, a waveguide transmission port A6, a waveguide transmission port B7, a waveguide transmission port C8, a waveguide transmission port D9, a superlattice structure 10, a topological non-mediocre photonic lattice unit 11, a topological mediocre photonic lattice unit 12, a non-mediocre topological area 13, a mediocre topological area 14, a cylindrical silicon rod 15, a waveguide transmission interface I16, a waveguide transmission interface II17 and an interface included angle bisector 18.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, a multifunctional encodable all-dielectric topological waveguide state switch includes a cylindrical silicon rod 15, and topological Non-Trivial photonic crystal lattice unit 11 and topological Trivial photonic crystal lattice unit 12 having a graphene-like structure are formed, and the topological Non-Trivial photonic lattice unit 11 and the topological Trivial photonic lattice unit 12 respectively construct a topological Non-Trivial topological area 13 (Non-trivascular Zone, NTZ) and a Trivial topological area 14 (trivascular Zone, TZ). The plain areas and the non-plain areas are staggered to form a cross-like waveguide transmission interface I16 and a waveguide transmission interface II17, and the waveguide topological switch has four topological domains. A chiral polarization source I1 and a polarization source II2 are arranged on a waveguide transmission interface I16 and a waveguide transmission interface II17, a chiral polarization source III3 and a polarization source IV4 are arranged on an included angle bisector (60 degrees) of the waveguide transmission interface I16 and the waveguide transmission interface II17, and a polarization source V5 at an interface intersection center is arranged at an intersection center of the waveguide transmission interface I16 and the waveguide transmission interface II 17. The waveguide transmission state is characterized at waveguide transmission port A6, waveguide transmission port B7, waveguide transmission port C8, and waveguide transmission port D9.
Specifically, the non-mediocre topological area 13 and the mediocre topological area 14 are both composed of the graphene-like topological non-mediocre photonic crystal unit 11 and the mediocre photonic crystal unit 12 constructed by all-dielectric cylindrical silicon rod groups, and the cylindrical silicon rod 15 has a radius of 0.11a and a height of a. In the topological photonic crystal lattice unit, t 0 Denotes the distance, t, between the nearest neighboring dielectric pillars within each topological lattice cell 1 Representing the distance of the nearest neighbor dielectric pillar between adjacent lattice cells. Wherein, t 0 ＝t 1 And =1/3a is the critical distance. If t 1 The crystal is called a non-plain topological photonic crystal when the crystal is more than 1/3a; if t is 1 And < 1/3a, the crystal is called a plain topological photonic crystal. Delta t = (t) for the invention 1 -t 0 )/t 0 Shows that the graphene-like C is not changed 6v The deformation amount under the condition of the crystal lattice, delta t & gt 0, is called a non-plain topological photonic crystal; δ t < 0 is called a plain topology photonic crystal. Wherein the graphene-like topology is a non-trivial photonic lattice unit 11, δ t =0.1; graphene-like topologies are mediocre to photonic lattice unit 12, where δ t = -0.1. Wherein the graphene-like lattice constant a is 1000nm. The chiral circularly polarized light source consists of 4 linear polarized antennas arranged in a square, and the phase of the 4 linear polarized antennas is increased or decreased by 90 degrees. Where LCP/RCP denotes reverse/clockwise circular polarization. The lower left corner shown in the structure diagram of fig. 1 is the origin, the coordinates of the polarized source I1 are (2.5a, 9.75l), the coordinates of the polarized source II2 are (8.5a, 3L), the coordinates of the polarized source III3 are (10.6 a, 10.05l), the coordinates of the polarized source IV4 are (10.4 a, 9.45L), and the coordinates of the polarized source V5 at the intersection center of the interface are (10.5a, 9.75l). The starting point coordinate of the waveguide transmission interface I16 is (0, 9.75L), and the end point coordinate is (18.5a, 9.75L); the coordinates of the starting point of the waveguide transmission interface II17 are (7.5a, 0), the coordinates of the ending point thereof are (13.5a, 18L), and the included angle between the waveguide transmission interface I16 and the waveguide transmission interface II17 is 60 degrees. The end point of the waveguide transmission interface I16 is provided with a waveguide transmission port A6 and a waveguide transmission port B7, the end point of the waveguide transmission interface II17 is provided with a waveguide transmission port C8 and a waveguide transmission port D9, the coordinate of the waveguide transmission port A6 is (0, 9.75L),the coordinates of the waveguide transmission port B7 are (18.5 a, 9.75L), the coordinates of the waveguide transmission port C8 are (7.5 a, 0), and the coordinates of the waveguide transmission port D9 are (13.5 a, 18L).
As shown in fig. 2 (a), the three-dimensional structure of the all-dielectric topological photonic crystal and the corresponding first brillouin zone energy band distribution of the topological photonic crystal are shown. Specifically, the present invention uses δ t = (t) 1 -t 0 )/t 0 Shows that the graphene-like C is not changed 6v The amount of deformation under lattice conditions. As shown in fig. 2bI, when δ t = -0.1, the lattice is a mediocre photonic crystal unit structure, the energy band distribution of the inverted lattice vector momentum space is calculated in the first brillouin, the doubly degenerated p-energy band and d-energy band are separated at the Γ point, and "Dirac cons" disappears. As shown in fig. 2biii, when δ t =0, the lattice is a mediocre topological photonic crystal unit structure, the energy band distribution of the reciprocal lattice vector momentum space is calculated in the first brillouin, and the p and d energy bands of the twofold degeneracy degenerate at the Γ point to form the fourfold degeneracy of the photon energy bands, "Dirac cons" appears. As shown in fig. 2bIII, when δ t =0.1, the lattice is a non-mediocre photonic crystal unit structure, the band distribution of the lattice momentum space is calculated in the first brillouin, the doubly degenerated p and d bands are separated again at the Γ point, "Dirac wires" disappear, and the bands are inverted.
As shown in fig. 3, which is a super-cell structure 10 (a × 9L) of the programmable multifunctional all-dielectric topological waveguide state switch, the energy band dispersion curves projected on the wave vector space in one lattice period can be calculated, and it can be seen from the curves that two upper and lower dispersion curves appear in the photonic crystal band gap, and they are symmetrical about kx =0. The group velocity of the topological boundary state can be judged to be unidirectional through the dispersion curve.
The multifunctional full-electric medium topological waveguide state switch capable of coding realizes the functions of optical waveguide cross-boundary transmission, waveguide beam splitting and multi-channel transmission by controlling the switch and the polarization direction (left rotation and right rotation) of the polarization sources at different positions. Specifically, as shown in fig. 4, in the figure, the transmission conditions of the polarized source I1 and the polarized source II2 are the waveguide transmission conditions in the unidirectional spiral boundary state when the frequency f =0.4788c/a, and the transmission conditions of all the ports of the waveguide transmission conditions in the centrosymmetric position can be obtained according to the symmetry of the waveguide state switch, as shown in table 1. According to the transmission condition of each port, the design of the invention realizes the cross-boundary transmission.
TABLE 1
As shown in fig. 5, the transmission condition of the waveguide is a unidirectional spiral boundary state waveguide transmission condition of the waveguide state switch under the action of the polarization source III3 and the polarization source IV4 when the frequency f =0.4788c/a, and according to the symmetry of the waveguide state switch, the waveguide transmission condition of the waveguide state switch at the centrosymmetric position can be obtained, and the transmission condition of all ports is shown in table 2. According to the transmission condition of each port, the design of the invention realizes the V-shaped beam splitting function of the waveguide.
TABLE 2
As shown in fig. 6, in (a), the waveguide transmission condition of the waveguide state switch is a unidirectional spiral boundary state waveguide transmission condition under the action of the polarized source V5 at the center of the interface intersection when the frequency f =0.4788 c/a. As shown in table 3, for different waveguide transmission boundaries or different polarization directions of the chiral sources, the normalized electric field energy intensity of waveguide transmission is not changed in the waveguide transmission port A6, the waveguide transmission port B7, the waveguide transmission port C8, and the waveguide transmission port D9, and it can be seen that the design of the present invention realizes the multi-channel transmission function of the waveguide according to the port output condition. It can be seen from fig. 6 (b) that the four port waveguides are approximately equal in energy and are not affected by the polarization direction of the chiral source and the different interfaces, where the peaks merely represent the position of the light source in practice.
TABLE 3
In the multifunctional all-dielectric topological waveguide state switch capable of coding, the left rotation of the polarization direction of a polarization source is set to be 0, the right rotation is set to be 1, the opening of a waveguide transmission port is 1, and the closing is 0, the left rotation and right rotation conditions of the light source are controlled through a digital micro circuit of a single chip microcomputer, so that the encoding of the position and the polarization direction of the light source by utilizing an external circuit can be realized, the switching conditions of 4 ports are obtained, and waveguide photonic devices with different functions are realized. If the information of the position of the polarization source I1 can be coded as that 01,1 represents on, and 0 represents off; levorotatory is 0 and dextrorotatory is 1; the port switch is 0, the port switch is 1, and the waveguide transmission port A6, the waveguide transmission port B7, the waveguide transmission port C8, and the waveguide transmission port D9 are arranged in this order. The coded control of the location of the polarized source I1 can be represented as 101000, 110010. Only one light source is allowed to operate at a time, and the other light sources are set to "0" in the on-off state. The light source is controlled by the singlechip, and the functions of light wave boundary transmission, waveguide beam splitting and waveguide multi-channel transmission are realized. As shown in fig. 4, polarized source I1 and polarized source II2 may effect transmission from the first interface to the second interface. As shown in fig. 5, a polarization source III3 and a polarization source IV4 can implement V-type beam splitting. As shown in fig. 6, a polarized source V5 can implement four-channel optical waveguide transmission.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A multifunctional full-dielectric topological waveguide state switch capable of being coded is characterized in that: comprises a non-mediocre topological area (13) and a mediocre topological area (14); the non-plain topological area (13) and the plain topological area (14) are arranged in a cross-like staggered manner to form a waveguide transmission interface I (16) and a waveguide transmission interface II (17); a polarization source I (1) is arranged on the waveguide transmission interface I (16), a polarization source II (2) is arranged on the waveguide transmission interface II (17), a polarization source III (3) and a polarization source IV (4) are arranged on a bisector of an included angle between the waveguide transmission interface I (16) and the waveguide transmission interface II (17), and a polarization source V (5) is arranged at the intersection center of the waveguide transmission interface I (16) and the waveguide transmission interface II (17);
the end points of the waveguide transmission interface I (16) are respectively provided with a waveguide transmission port A (6) and a waveguide transmission port B (7), and the end points of the waveguide transmission interface II (17) are respectively provided with a waveguide transmission port C (8) and a waveguide transmission port D (9);
the non-mediocre topological area (13) is composed of graphene-like lattice topology non-mediocre photonic lattice units (11), and the mediocre topological area (14) is composed of graphene-like lattice topology mediocre photonic lattice units (12);
the method for realizing waveguide transmission comprises the following steps: the polarization source I (1), the polarization source II (2), the polarization source III (3), the polarization source IV (4) and the polarization source V (5) at the interface intersection are set to be 1, the switch is set to be 0, the left-hand rotation is set to be 0, the right-hand rotation is set to be 1, the waveguide transmission port A (6), the waveguide transmission port B (7), the waveguide transmission port C (8) and the waveguide transmission port D (9) are set to be 1, the switch is set to be 0, the on-off of the light source at each position is controlled through a single chip microcomputer digital micro circuit, the left-hand rotation and the right-hand rotation are controlled, the encoding of the position and the polarization direction of the light source by using an external circuit is realized, the switching conditions of the waveguide transmission port A (6), the waveguide transmission port B (7), the waveguide transmission port C (8) and the waveguide transmission port D (9) are obtained, and waveguide photonic devices with different functions are realized.
2. The encodable multifunctional all-dielectric topological waveguide state switch according to claim 1, wherein: the topological non-mediocre photonic crystal lattice unit (11) and the topological mediocre photonic crystal lattice unit (12) are both composed of cylindrical silicon rods (15);
the radius of the cylindrical silicon rod (15) is 0.11aHeight ofaRefractive index of
，aIs a graphene-like lattice constant with a value of 1000nm; the refractive index of air at room temperature was 1.
3. The encodable multifunctional all-dielectric topological waveguide state switch according to claim 2, wherein: the topological non-trivial photonic lattice unit (11) satisfies the constraint:t 1 ＞(1/3)a(ii) a Topologically mediocre photonic lattice cells (12) meet the constraint:t 1 ＜(1/3)awhereint 1 Representing the distance of the nearest neighbor dielectric pillar between adjacent lattice cells.
4. The encodable multifunctional all-dielectric topological waveguide state switch according to claim 2 or 3, characterized in that: the left lower corner of the encodable multifunctional all-dielectric topological waveguide state switch structure is taken as an origin, and the coordinates of the starting point of a waveguide transmission interface I (16) are (0, 9.75)L) The coordinate of the end point is (18.5)a，9.75L) (ii) a The starting point coordinate of the waveguide transmission interface II (17) is (7.5)a0), end point coordinate is (13.5)a，18L) The included angle between the waveguide transmission interface I (16) and the waveguide transmission interface II (17) is 60 degrees,Lis the side length of the graphene-like lattice,L=
。
5. the encodable multifunctional all-dielectric topological waveguide state switch according to claim 4, wherein: the polarization source I (1), the polarization source II (2), the polarization source III (3), the polarization source IV (4) and the polarization source V (5) are chiral sources with circular polarization, and the chiral sources are composed of 4 linear polarization antennas which are arranged in a square shape.
6. The encodable multifunctional all-dielectric topological waveguide dynamic switch according to claim 5, wherein: the lower left corner of the structure of the multifunctional full-dielectric topological waveguide dynamic switch capable of coding is taken as the origin, and the coordinate of the polarization source I (1) is (2.5)a，9.75L) The coordinate of the polarization source II (2) is (8.5)a, 3L) The coordinate of the polarization source III (3) is (10.6)a, 10.05L) Polarized source IV(4) Has the coordinate of (10.4)a, 9.45L) The coordinate of the polarization source V (5) at the interface intersection is (10.5)a, 9.75L) The coordinates of the waveguide transmission port A (6) are (0, 9.75)L) The coordinate of the waveguide transmission port B (7) is (18.5)a, 9.75L) The coordinate of the waveguide transmission port C (8) is (7.5)a0), the coordinate of the waveguide transmission port D (9) is (13.5)a, 18L)。
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| JP7318864B2 (en) * | 2019-08-22 | 2023-08-01 | 国立大学法人東京工業大学 | topological optical circuit |
| CN112799259B (en) * | 2019-11-13 | 2022-03-25 | 北京大学 | Information conversion device and method between exciton valley polarization and photon topological state |
| CN113552670B (en) * | 2020-04-26 | 2022-06-21 | 电子科技大学 | Mach-Zehnder interferometer protected by topology |
| CN113900161B (en) * | 2021-09-09 | 2023-02-17 | 江苏大学 | Topological photonic crystal structure based on isosceles triangle dielectric cylinder and optical waveguide |
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