A defect-resistant photon-coded XOR operator

Abstract

The present invention discloses a defect-resistant photon coded XOR operator, comprising a photonic crystal dielectric column array, a parallel plate waveguide, an absorbing material, a first monopole antenna that remains in an open state, and second and third monopole antennas whose states can be freely changed; the photonic crystal dielectric column array is a two-dimensional square lattice structure, one side of the photonic crystal dielectric column array is an ideal electric conductor PEC, and the other three sides are absorbing materials; the photonic crystal dielectric column array and the absorbing material are both located between two parallel plate waveguides; the electromagnetic wave generated by the first monopole antenna under the action of an external magnetic field can form a boundary state that is unidirectionally transmitted along the PEC, and the second and third monopole antennas are on the same straight line as the first monopole antenna; by detecting the electric field value on the transmission path, the logic output is determined by the number of peaks after its fast Fourier transform. The present invention has the advantages of immunity to surface defects, simple structure, high accuracy, etc., and solves the disadvantage that the traditional coded XOR operator is sensitive to defects.

Description

Technical Field

[0001] The invention relates to the field of semiconductor optoelectronic devices, in particular to a defect-resistant photon coding XOR operator based on photonic crystal surface states. Background Art

[0002] Photonic crystals have a photonic bandgap that can suppress the spontaneous radiation of atoms and molecules. After decades of theoretical and experimental research, it has been confirmed that adding defects to photonic crystals can produce defect states in the photonic bandgap, such as edge states and corner states. The generation of defect states can allow electromagnetic waves to be transmitted locally in a certain area, making photonic crystals have broad application prospects in the fields of modern optical waveguides and optical communication technologies.

[0003] The chiral boundary states in the quantum Hall effect have attracted widespread attention. Electromagnetic waves in the chiral boundary states can be transmitted along the boundaries, have unique directionality, and are highly robust to disordered scattering caused by defects in the system. The chiral boundary states in two-dimensional photonic crystals are confined near the edges, have unidirectional transmission properties, and good robustness.

[0004] Electronic logic operators currently on the market are usually not robust to defects, which affects their working performance. In view of this situation, the present invention designs a photon coded logic operator that is immune to defects. Summary of the invention

[0005] Purpose of the invention: The purpose of the present invention is to provide a photon coded XOR operator having the advantages of high sensitivity and immunity to defects.

[0006] Technical solution: In order to achieve the above-mentioned invention object, the present invention adopts the following technical solution:

[0007] A defect-resistant photon coding XOR operator comprises a photonic crystal dielectric column array, a parallel plate waveguide, an absorbing material, a first monopole antenna kept in an open state, and a second and a third monopole antenna whose states can be freely changed; the photonic crystal dielectric column array is a two-dimensional square lattice structure, one side of the photonic crystal dielectric column array is an ideal electric conductor PEC, and the other three sides are absorbing materials; the photonic crystal dielectric column array and the absorbing material are both located between two parallel plate waveguides; the electromagnetic wave generated by the first monopole antenna under the action of an external magnetic field can form a boundary state of unidirectional transmission along the PEC, and the second and the third monopole antennas are on the same straight line as the first monopole antenna; the logic output is determined by detecting the electric field value on the transmission path and the number of peaks after fast Fourier transformation; when one and only one of the second and the third monopole antennas is open, the logic output is true, and the logic output is false in other cases.

[0008] Furthermore, the electric field value is detected by setting a number of equally spaced monopole antennas on the electromagnetic wave transmission path, and then the electric field value is fast Fourier transformed using a signal detector. When the peak number is 1, the logic output result is true, and when the peak number is 2, the logic output result is false.

[0009] Furthermore, the photonic crystal dielectric column is made of ferrite cylindrical material.

[0010] Furthermore, the first monopole antenna is fixed between the photonic crystal dielectric column array and the PEC, and the distances between the second monopole antenna and the third monopole antenna and the first monopole antenna are determined by the electromagnetic wave phase cancellation condition.

[0011] Furthermore, the first monopole antenna excites the electric field transmitted between the photonic crystal dielectric column array and the ideal conductor to have two different wave vectors k1 and k2, corresponding to two peaks in the Fourier transform. The electric field generated by the second or third monopole antenna is phase-cancelled, causing one of the wave vectors to disappear, corresponding to one peak in the Fourier transform.

[0012] Furthermore, the ratio of the main lobe peak value to the interference peak value after fast Fourier transformation of the electric field value of the electromagnetic wave after the phase cancellation of the second and third monopole antennas is greater than the ratio of the two electric field eigenmodes.

[0013] Furthermore, when the defect length of the ideal electrical conductor does not exceed 3 mm, the operator can still perform logical operations.

[0014] Beneficial effects: Compared with the prior art, the photon coded XOR operator proposed in the present invention has high sensitivity and certain anti-interference ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of a three-dimensional model structure of an embodiment of the present invention;

[0016] Figure 2 is a two-dimensional schematic diagram of an embodiment of the present invention;

[0017] Figure 3 It is a diagram showing the electric field distribution of the monopole antenna in the embodiment of the present invention under the action of electromagnetic waves with a frequency of F=12.6 GHz in different switch states and a schematic diagram showing the result of fast Fourier transform of the electric field value.

[0018] Figure 4 Schematic diagram of the eigenmode of the monopole antenna in the embodiment of the present invention.

[0019] Figure 5 It is a two-dimensional schematic diagram when the embodiment of the present invention has defects.

[0020] Figure 6It is a schematic diagram of the results of fast Fourier transform of electric field values ​​in scenarios with different degrees of defects according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The present invention is further illustrated below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. After reading the present invention, modifications to various equivalent forms of the present invention by those skilled in the art all fall within the scope defined by the appended claims of the present application.

[0022] The embodiment of the present invention discloses a defect-resistant photon coded XOR operator, which mainly includes a photonic crystal dielectric column 1 array, a parallel plate waveguide 2, an absorbing material 3, a first monopole antenna 4 that remains in an open state, a second monopole antenna 5 whose state can be freely changed, and a third monopole antenna 6. The photonic crystal dielectric column array is a two-dimensional square lattice structure, one side of the dielectric column array is an ideal electric conductor 7, and the other three sides are absorbing materials 3; the dielectric column array and the absorbing material are both located between two parallel plate waveguides 2.

[0023] The operator is based on a two-dimensional square lattice dielectric column array structure, where dielectric columns are arranged at equal intervals along the x-axis and y-axis directions, and the first row of dielectric columns along the x-direction is adjacent to an ideal conductor. By adjusting the frequency, the electromagnetic wave can form a local boundary state that is unidirectionally transmitted along the ideal conductor. That is, at a specific frequency, the electromagnetic wave generated by the monopole antenna 4 under the action of an external magnetic field can form a boundary state that is unidirectionally transmitted along the PEC; by detecting the electric field value on the electromagnetic wave transmission path, the logic output is determined by the number of peaks after its fast Fourier transform. The function of the XOR operation is realized by changing the state of the two adjustable monopole antennas.

[0024] In a specific example of the present invention, the photonic crystal dielectric column array is composed of periodically arranged ferrite cylinders with a relative dielectric constant of 12.56, the radius of the ferrite cylinder is 2.7mm, the height is h=10mm, and the lattice constant of the array is 20mm. The quasi-two-dimensional structure composed of a square lattice is placed as a whole in a parallel plate waveguide 2 composed of two upper and lower metal aluminum plates with a thickness of D1, and D1 is 1mm~2mm. The ferrite column lattice is surrounded by an absorbing material with a thickness of D, and D is 10mm~20mm. The length of the monopole antenna 4 kept in the open state is 10mm, and it is fixed in a suitable position range between the photonic crystal dielectric column array and the PEC. It can generate a boundary state that is unidirectionally transmitted along the PEC under the action of an external magnetic field with a frequency equal to 12.6GHz, and the electromagnetic wave is composed of two modes superimposed, and the two modes are as follows. Figure 4 As shown in (a) and (b), the two monopole antennas 5 and 6 whose switch states can be freely changed are geometrically the same as the monopole antenna 4, except that the monopole antenna 4 needs to remain in the open state.

[0025] The distance between the position of the monopole antennas 5 and 6 and the monopole antenna 4 is determined by the phase cancellation condition of the electromagnetic wave. In a specific frequency range, the electric field excited by the monopole antenna 4 and transmitted between the photonic crystal dielectric column array and the ideal electric conductor has two different wave vectors k1 and k2, corresponding to two peaks in the Fourier transform. The phase cancellation of the electric field generated by the monopole antennas 5 and 6 can make one of the wave vectors disappear, corresponding to one peak in the Fourier transform.

[0026] In the specific example of the present invention, simulation and experiments show that when the distance between the monopole antennas 4 and 5 is L1 = 21.2 mm, and the distance between the monopole antennas 4 and 6 is L2 = 58.8 mm, the function of the XOR operator can be realized.

[0027] In an embodiment of the present invention, a number of equally spaced monopole antennas are arranged on the electromagnetic wave transmission path to detect the electric field value, and then a signal detector is used to perform Fourier transform on the z component of the electromagnetic wave electric field strength, and the output result is obtained according to the number of peak values ​​of the Fourier transform, and finally an exclusive-OR logic operation is realized. Figure 2 The 8 in the figure indicates that five monopole antennas with an interval of 10 mm are used to detect the electric field value.

[0028] Figure 3 (a) shows the electric field distribution diagram when both monopole antenna 5 and monopole antenna 6 are turned off. At this time, the result obtained by fast Fourier transforming the electric field values ​​corresponding to the detection positions of the five monopole antennas is shown in (b). It can be seen that there are peaks at k=0.34 and k=0.94, respectively, and the total number of peaks is 2. (c) shows the electric field distribution diagram when monopole antenna 5 is turned off and monopole antenna 6 is turned on. At this time, the result obtained by fast Fourier transforming the electric field value is shown in (d). It can be seen that there is a peak at k=0.94, and the total number of peaks is 1. (e) shows the electric field distribution diagram when monopole antenna 5 is turned on and monopole antenna 6 is turned off. At this time, the result obtained by fast Fourier transforming the electric field value is shown in (f). It can be seen that there is a peak at k=0.34, and the total number of peaks is 1. (g) represents the electric field distribution diagram when monopole antenna 5 and monopole antenna 6 are both turned on. At this time, the result of fast Fourier transform of the electric field value is shown in (h). It can be seen that there are peaks at k=0.34 and k=0.94 respectively, and the total number of peaks is 2. The output result of the logic operation can be judged by the number of peaks. When the number of peaks is equal to 1, the logic output result is "true", and when the number of peaks is 2, the logic output result is "false". That is, when one and only one of monopole antenna 5 and monopole antenna 6 is turned on, the logic output is "true", and the logic output in other cases is "false". This structure realizes the function of XOR logic operation.

[0029] Figure 4(a) shows that the electric field eigenmode of the monopole antenna 4 at k=0.34 is 7.64, (b) shows that the electric field eigenmode of the monopole antenna 4 at k=0.94 is 6.46, and the ratio of the two electric field eigenmodes is 0.85.

[0030] In this embodiment, defects are simulated by changing the length of the ideal electrical conductor penetrating into the magnetic medium column array. Figure 5 There is a defect in the PEC (ideal electric conductor) at 40 mm on the right side of the monopole antenna 4. The length of the ideal electric conductor penetrating into the magnetic medium column array is L, and the size of L represents the degree of the defect.

[0031] Figure 6 Monopole antenna 5 is turned on and monopole antenna 6 is turned off. The results of fast Fourier transform of electric field values ​​under different defect levels L. When L≤3mm, there is a noise peak at k=0.94, but the ratio of the peak at k=0.94 to the peak at k=0.34 is less than the ratio of the two electric field eigenmodes, so it does not affect the output result of the optical coding XOR operator.

[0032] In summary, the photon coded XOR operator disclosed in the embodiment of the present invention has the advantages of immunity to surface defects, simple structure, high accuracy, etc., which solves the disadvantage that the traditional coded XOR operator is sensitive to defects.

Claims

1. A defect-resistant photon coded XOR operator, characterized in that: The invention comprises a photonic crystal dielectric column array, a parallel plate waveguide, an absorbing material, a first monopole antenna which is kept in an open state, and a second and a third monopole antenna whose states can be changed freely; the photonic crystal dielectric column array is a two-dimensional square lattice structure, one side of the photonic crystal dielectric column array is an ideal electric conductor PEC, and the other three sides are absorbing materials; the photonic crystal dielectric column array and the absorbing material are both located between two parallel plate waveguides; the electromagnetic wave generated by the first monopole antenna under the action of an external magnetic field can form a boundary state of unidirectional transmission along the PEC, and the second and the third monopole antennas are on the same straight line as the first monopole antenna; the logic output is determined by detecting the electric field value on the transmission path and the number of peaks after fast Fourier transformation; when only one of the second and the third monopole antennas is open, the logic output is true, and the logic output is false in other cases; the first monopole antenna is fixed between the photonic crystal dielectric column array and the PEC, and the positions of the second monopole antenna and the third monopole antenna and the distance from the first monopole antenna are determined by the electromagnetic wave phase cancellation condition.

2. The defect-resistant photon coded XOR operator according to claim 1, characterized in that: The electric field value is detected by setting several equally spaced monopole antennas on the electromagnetic wave transmission path, and then the electric field value is fast Fourier transformed using a signal detector. When the peak number is 1, the logic output result is true, and when the peak number is 2, the logic output result is false.

3. The defect-resistant photon coded XOR operator according to claim 1, characterized in that: The photonic crystal dielectric column is made of ferrite cylindrical material.

4. The defect-resistant photon coded XOR operator according to claim 1, characterized in that: The first monopole antenna excites an electric field transmitted between the photonic crystal dielectric column array and the ideal conductor with two different wave vectors k1 and k2, corresponding to two peaks in the Fourier transform. The electric field generated by the second or third monopole antenna is phase-cancelled, causing one of the wave vectors to disappear, corresponding to a peak in the Fourier transform.

5. The defect-resistant photon coded XOR operator according to claim 1, characterized in that: The ratio of the main lobe peak value to the interference peak value after fast Fourier transformation of the electric field value of the electromagnetic wave after the phase cancellation of the second and third monopole antennas is greater than the ratio of the two electric field eigenmodes.

6. The defect-resistant photon coded XOR operator according to claim 1, characterized in that: When the defect length of the ideal conductor does not exceed 3mm, the operator can still perform logical operations.

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