CN112185487B - Target excitation frequency searching method and device for photonic crystal and readable medium - Google Patents
Target excitation frequency searching method and device for photonic crystal and readable medium Download PDFInfo
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Abstract
The invention relates to a target excitation frequency searching method and device of a photonic crystal and a readable medium, wherein the method comprises the following steps: obtaining triple degenerated point frequency of a pre-constructed photonic crystal; determining a plurality of first to-be-detected excitation frequencies according to the numerical precision of the triple degeneracy point frequency, wherein each first to-be-detected excitation frequency is larger than the triple degeneracy point frequency; for each first to-be-detected excitation frequency, emitting electromagnetic waves at the first to-be-detected excitation frequency and under different incidence angles to the photonic crystal to obtain incidence angle change information; and determining a target excitation frequency according to each incidence angle change information, wherein the electromagnetic wave with the target excitation frequency cannot be incident to the photonic crystal under a set angle. The scheme of the invention can find the target excitation frequency which can well eliminate the propagation phase in the current source propagation process.
Description
Technical Field
The present invention relates to the field of computer technologies, and in particular, to a method and an apparatus for searching a target excitation frequency of a photonic crystal, and a readable medium.
Background
The zero-index material has a near zero intrinsic parameter, so that the wave propagates in the zero-index material without phase change, and such a special material has many interesting wave manipulation properties. Zero-index materials are classified into single-zero-index materials and double-zero-index materials. The single-zero refractive index material is further divided into a material with a dielectric constant close to zero and a material with a magnetic permeability close to zero. However, since the single zero refractive index material has only one constitutive parameter near zero, the impedance of the material is offset from the background field, which is not suitable for practical application. The material with double zero refractive index, that is, the material with two intrinsic parameters close to zero, has a finite effective impedance with the background field, which can overcome the defect that the single zero refractive index medium is not practical.
In the prior art, these materials can be implemented using artificial composites consisting of metal resonators or chiral inclusions, but the metal component has losses that impair the high frequency function. The method of the artificial composite material can be, for example: by utilizing the occasional degeneracy of the energy band, the photonic crystal which displays dirac-like cone dispersion at a limited frequency in the center of the Brillouin zone is designed and manufactured, and the photonic crystal operating wave with reasonable dielectric constant has a refractive index which is near zero at the dirac-like point frequency.
In theory, when the center of the Brillouin zone in the photonic crystal is excited by the dirac point-like frequency (corresponding to the triple degeneracy point), the equivalent zero-refractive index material is corresponding, and the interface radiation wave is equal-phase radiation. However, the interface radiation wave does not exit in an equiphase in a practical situation, so that a suitable photonic crystal excitation frequency, i.e. a target excitation frequency, needs to be found in a near-zero refractive index range.
In view of the foregoing, it is desirable to provide a method, apparatus and readable medium for searching for a target excitation frequency of a photonic crystal to solve the foregoing disadvantages.
Disclosure of Invention
The invention aims to solve the technical problem of finding out a target excitation frequency capable of better eliminating a propagation phase in a current source propagation process, and provides a target excitation frequency finding method and device for a photonic crystal and a readable medium aiming at the defects in the prior art.
In order to solve the above technical problems, the present invention provides a method for searching a target excitation frequency of a photonic crystal, including:
obtaining triple degenerated point frequency of a pre-constructed photonic crystal;
determining a plurality of first to-be-detected excitation frequencies according to the numerical precision of the triple degeneracy point frequency, wherein each first to-be-detected excitation frequency is larger than the triple degeneracy point frequency;
for each first to-be-detected excitation frequency, emitting electromagnetic waves at the first to-be-detected excitation frequency and under different incidence angles to the photonic crystal to obtain incidence angle change information;
and determining a target excitation frequency according to each incidence angle change information, wherein the electromagnetic wave with the target excitation frequency cannot be incident to the photonic crystal under a set angle.
In one possible implementation manner, the determining a plurality of first to-be-detected excitation frequencies according to the numerical precision of the triple degenerated dot frequencies includes:
determining a plurality of second excitation frequencies to be detected according to the numerical precision of the triple degenerated dot frequency, wherein the second excitation frequencies to be detected comprise the first excitation frequencies to be detected;
for each second excitation frequency to be detected, emitting electromagnetic waves with the second excitation frequency to be detected from the photonic crystal to obtain emission phase fluctuation information;
and determining a plurality of first to-be-detected excitation frequencies from the plurality of second to-be-detected excitation frequencies according to the emergent phase fluctuation information.
In one possible implementation manner, the determining, according to each of the outgoing phase fluctuation information, a plurality of first to-be-detected excitation frequencies from a plurality of second to-be-detected excitation frequencies includes:
determining the emergent phase fluctuation information with the minimum value from the emergent phase fluctuation information, and determining the second to-be-detected excitation frequency corresponding to the emergent phase fluctuation information as the third to-be-detected excitation frequency;
determining a second excitation frequency to be detected, which is located between the triple degeneracy point frequency and the third excitation frequency to be detected, and at most two second excitation frequencies to be detected, which exceed the third excitation frequency to be detected and are adjacent to the third excitation frequency to be detected, as first excitation frequencies to be detected.
In one possible implementation manner, the determining the target excitation frequency according to each incident angle change information includes:
for each piece of incidence angle change information, determining current incidence angle change information with similarity larger than a preset similarity threshold value with the preset incidence angle change information as target incidence angle change information;
and determining a first excitation frequency to be detected corresponding to the target incidence angle change information as a target excitation frequency.
The invention also provides a target excitation frequency searching device of the photonic crystal, which comprises:
the acquisition module is used for acquiring triple degeneracy point frequency of the photon crystal constructed in advance;
the first determining module is used for determining a plurality of first to-be-detected excitation frequencies according to the numerical precision of the triple degenerated point frequencies, wherein each first to-be-detected excitation frequency is larger than the triple degenerated point frequency;
the obtaining module is used for transmitting electromagnetic waves at the first to-be-detected excitation frequency and at different incidence angles to the photonic crystal for each first to-be-detected excitation frequency to obtain incidence angle change information;
and the second determining module is used for determining a target excitation frequency according to the incidence angle change information, wherein the electromagnetic wave with the target excitation frequency cannot be incident to the photonic crystal under a set angle.
In one possible implementation manner, the first determining module is configured to perform the following operations:
determining a plurality of second excitation frequencies to be detected according to the numerical precision of the triple degenerated dot frequency, wherein the second excitation frequencies to be detected comprise the first excitation frequencies to be detected;
for each second excitation frequency to be detected, emitting electromagnetic waves with the second excitation frequency to be detected from the photonic crystal to obtain emission phase fluctuation information;
and determining a plurality of first to-be-detected excitation frequencies from the plurality of second to-be-detected excitation frequencies according to the emergent phase fluctuation information.
In one possible implementation manner, the first determining module is configured to, when executing the determining, according to each of the outgoing phase fluctuation information, a plurality of first to-be-detected excitation frequencies among a plurality of second to-be-detected excitation frequencies, execute the following operations:
determining the emergent phase fluctuation information with the minimum value from the emergent phase fluctuation information, and determining the second to-be-detected excitation frequency corresponding to the emergent phase fluctuation information as the third to-be-detected excitation frequency;
determining a second excitation frequency to be detected, which is located between the triple degeneracy point frequency and the third excitation frequency to be detected, and at most two second excitation frequencies to be detected, which exceed the third excitation frequency to be detected and are adjacent to the third excitation frequency to be detected, as first excitation frequencies to be detected.
In one possible implementation manner, the second determining module is configured to perform the following operations:
for each piece of incidence angle change information, determining current incidence angle change information with similarity larger than a preset similarity threshold value with the preset incidence angle change information as target incidence angle change information;
and determining a first excitation frequency to be detected corresponding to the target incidence angle change information as a target excitation frequency.
The invention also provides a target excitation frequency searching device of the photonic crystal, which comprises: at least one memory and at least one processor;
the at least one memory for storing a machine readable program;
the at least one processor is configured to invoke the machine readable program to perform the method as described above.
The invention also provides a computer readable medium having stored thereon computer instructions which, when executed by a processor, cause the processor to perform a method as described above.
The target excitation frequency searching method, the target excitation frequency searching device and the readable medium for implementing the photonic crystal have the following beneficial effects:
firstly, acquiring triple degenerate point frequency of a pre-constructed photonic crystal, and then determining a plurality of first to-be-detected excitation frequencies according to the numerical accuracy of the triple degenerate point frequency, wherein each first to-be-detected excitation frequency is larger than the triple degenerate point frequency; then, aiming at each first excitation frequency to be detected, transmitting electromagnetic waves under different incidence angles at the first excitation frequency to be detected to the photonic crystal to obtain incidence angle change information; and finally, determining target excitation frequency according to the change information of each incidence angle, wherein the electromagnetic wave with the target excitation frequency cannot be incident to the photonic crystal under the set angle. By the arrangement, on the basis of ensuring that the photonic crystal is still an equivalent near-zero refractive index material, a target excitation frequency capable of better eliminating the propagation phase in the current source propagation process can be found out through determining a plurality of first excitation frequencies to be detected which are all larger than the triple degeneracy point frequency and according to the incident angle change information of electromagnetic waves corresponding to each first excitation frequency to be detected; when a plurality of current sources are embedded in the photonic crystal, a better electric field enhancement effect can be realized on the emergent surface of the photonic crystal, so that a better power synthesis effect can be realized on the emergent surface of the photonic crystal.
Drawings
FIG. 1 is a flow chart of a method for finding a target excitation frequency of a photonic crystal according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an apparatus in which a target excitation frequency searching device for a photonic crystal is located according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a target excitation frequency lookup device for a photonic crystal according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a photonic crystal according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of the distribution of the radiated electric field after embedding a current source in an ideal near-zero refractive index material according to one embodiment of the present invention;
FIG. 6 is a schematic diagram of the distribution of the radiated electric field after embedding a current source of triple degeneracy point frequency in the photonic crystal depicted in FIG. 4 in accordance with one embodiment of the present invention;
FIG. 7 is a schematic diagram showing the distribution of the fluctuation of the outgoing phase of the electromagnetic wave of the second excitation frequency to be detected from the photonic crystal shown in FIG. 4 according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a model for calculating the distribution of transmittance with the incident angle of electromagnetic waves according to an embodiment of the present invention;
FIG. 9 is a schematic diagram showing the transmittance of an ideal near-zero refractive index material according to the variation of the incident angle of electromagnetic waves according to an embodiment of the present invention;
FIG. 10 is a graph showing transmittance versus incident angle of electromagnetic waves when a photonic crystal is excited with electromagnetic waves of triple degenerate point frequency according to an embodiment of the present invention;
FIG. 11 is a schematic diagram showing a transmittance variation with an incident angle of an electromagnetic wave when a photonic crystal is excited by an electromagnetic wave with a second excitation frequency to be detected of 0.542 according to an embodiment of the present invention;
FIG. 12 is a schematic diagram showing a transmittance variation with an incident angle of an electromagnetic wave when a photonic crystal is excited by an electromagnetic wave with a second excitation frequency to be detected of 0.543 according to an embodiment of the present invention;
FIG. 13 is a schematic diagram showing a transmittance variation with an incident angle of an electromagnetic wave when a photonic crystal is excited by an electromagnetic wave having a second excitation frequency to be detected of 0.544 according to an embodiment of the present invention;
FIG. 14 is a graph showing transmittance variation with incident angle of electromagnetic wave when a photonic crystal is excited by using electromagnetic wave with a second excitation frequency to be detected of 0.545 according to an embodiment of the present invention;
FIG. 15 is a schematic diagram showing a transmittance variation with an incident angle of an electromagnetic wave when a photonic crystal is excited by an electromagnetic wave with a second excitation frequency to be detected of 0.546 according to an embodiment of the present invention;
FIG. 16 is a schematic diagram showing a transmittance variation with an incident angle of an electromagnetic wave when a photonic crystal is excited by an electromagnetic wave with a second excitation frequency to be detected of 0.547 according to an embodiment of the present invention;
FIG. 17 is a schematic diagram of a model of power synthesis in the photonic crystal of FIG. 4, provided in accordance with an embodiment of the present invention;
FIG. 18 is a schematic diagram showing the distribution of the radiated electric field when a current source with a target excitation frequency is embedded in the photonic crystal shown in FIG. 4 according to an embodiment of the present invention;
FIG. 19 is a schematic diagram showing the distribution of the radiated electric field when two current sources with target excitation frequencies are embedded in the photonic crystal shown in FIG. 4 according to an embodiment of the present invention;
FIG. 20 is a schematic diagram of a radiation electric field distribution when three current sources with target excitation frequencies are embedded in the photonic crystal shown in FIG. 4 according to an embodiment of the present invention;
fig. 21 is a schematic diagram showing the distribution of the radiated electric field values shown in fig. 18, 19 and 20 according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, a method for searching a target excitation frequency of a photonic crystal according to an embodiment of the present invention includes:
102, determining a plurality of first to-be-detected excitation frequencies according to the numerical precision of the triple degenerated point frequencies, wherein each first to-be-detected excitation frequency is larger than the triple degenerated point frequency;
and 104, determining a target excitation frequency according to the incidence angle change information, wherein the electromagnetic wave with the target excitation frequency cannot be incident to the photonic crystal under a set angle.
In the embodiment, first, the frequency of a triple degenerate point of a photon crystal constructed in advance is obtained, and then a plurality of first to-be-detected excitation frequencies are determined according to the numerical precision of the frequency of the triple degenerate point, wherein each first to-be-detected excitation frequency is larger than the frequency of the triple degenerate point; then, aiming at each first excitation frequency to be detected, transmitting electromagnetic waves under different incidence angles at the first excitation frequency to be detected to the photonic crystal to obtain incidence angle change information; and finally, determining target excitation frequency according to the change information of each incidence angle, wherein the electromagnetic wave with the target excitation frequency cannot be incident to the photonic crystal under the set angle. By the arrangement, on the basis of ensuring that the photonic crystal is still an equivalent near-zero refractive index material, a target excitation frequency capable of better eliminating the propagation phase in the current source propagation process can be found out through determining a plurality of first excitation frequencies to be detected which are all larger than the triple degeneracy point frequency and according to the incident angle change information of electromagnetic waves corresponding to each first excitation frequency to be detected; when a plurality of current sources are embedded in the photonic crystal, a better electric field enhancement effect can be realized on the emergent surface of the photonic crystal, so that a better power synthesis effect can be realized on the emergent surface of the photonic crystal.
It can be appreciated that from the band theory it can be known that: when the excitation frequency to be detected is smaller than the triple degeneracy point frequency, the propagation phase in the current source propagation process is less prone to be eliminated, and therefore power synthesis is less likely to be achieved. Therefore, the excitation frequency to be detected needs to be larger than the triple degenerated point frequency, so that a target excitation frequency which can well eliminate the propagation phase in the current source propagation process can be found.
The inventive concept of the present invention will be explained in conjunction with actual experimental data.
As shown in fig. 4, parameters of the photonic crystal constructed in advance are as follows: the lattice constant is a, the radius of the dielectric cylinder is R, wherein R=0.2a, the dielectric constant of the dielectric cylinder is epsilon=12.5, the effective magnetic permeability mu=1, and the dielectric cylinder is embedded in the air. The photonic crystal is utilized to realize the structure of a triple degeneracy point at the point gamma of the Brillouin zone, and the triple degeneracy point frequency is obtained through an effective medium theory, and the dimensionless numerical value of the triple degeneracy point frequency is calculated to be 0.541 corresponding to the excitation frequency of the photonic crystal with the effective dielectric constant and the effective magnetic permeability being zero.
As shown in fig. 5, fig. 5 shows the refractive index of the material at an ideal near zero refractive index (i.e. a relative dielectric constant of epsilon=10 -6 Relative permeability μ=10 -6 ) A schematic diagram of the distribution of the radiated electric field of a current source (e.g. 1A) is embedded in the center of (a).
As shown in fig. 6, based on the photonic crystal shown in fig. 4, the photonic crystal in fig. 6 has a size of 20a×20a (i.e. has 400 dielectric cylinders, whereas the photonic crystal in fig. 4 has 4 dielectric cylinders), and a current source (e.g. 1A) is embedded in the center of the photonic crystal in fig. 6, and fig. 6 is a schematic diagram of a radiation electric field distribution when the photonic crystal is excited by using an electromagnetic wave with a triple degenerate point frequency of 0.541. In comparison with an ideal near-zero refractive index material, it was found that the interface of a photonic crystal of an equivalent near-zero refractive index material excited by an electromagnetic wave having a triple degenerate point frequency of 0.541 is not plane wave type radiation and is quite different from the ideal case.
Based on the above analysis, it can be seen that a target excitation frequency needs to be found to be able to better eliminate the propagation phase in the current source propagation process, that is, the plane wave type radiation is on the interface of the photonic crystal of the equivalent near-zero refractive index material excited by the target excitation frequency, and the difference from the ideal situation is small.
In one embodiment of the present invention, based on the method for searching the target excitation frequency of the photonic crystal shown in fig. 1, the determining a plurality of first excitation frequencies to be detected according to the numerical precision of the triple degenerated dot frequencies includes:
determining a plurality of second excitation frequencies to be detected according to the numerical precision of the triple degenerated dot frequency, wherein the second excitation frequencies to be detected comprise the first excitation frequencies to be detected;
for each second excitation frequency to be detected, emitting electromagnetic waves with the second excitation frequency to be detected from the photonic crystal to obtain emission phase fluctuation information;
and determining a plurality of first to-be-detected excitation frequencies from the plurality of second to-be-detected excitation frequencies according to the emergent phase fluctuation information.
According to the embodiment of the invention, the first to-be-detected excitation frequencies can be determined in the second to-be-detected excitation frequencies according to the emergent phase fluctuation information of the electromagnetic waves of the second to-be-detected excitation frequencies, so that the calculation resources are saved, the calculation speed is improved, and the target excitation frequency can be found more quickly.
As an example, a triple degenerated dot frequency of 0.541 has a numerical precision of 10 -3 Therefore, the plurality of second excitation frequencies to be detected can be determined according to the numerical precision, for example, the excitation frequencies to be detected can be 0.541-0.550, can be 0.541-0.560, and can be in other ranges. As shown in fig. 7, the range of the second excitation frequency to be detected provided in the embodiment of the present invention is 0.542-0.572, i.e. the second excitation frequency to be detected may be 0.542, 0.543, 0.544 and … … 0.572.
In one embodiment of the present invention, based on the method for searching the target excitation frequency of the photonic crystal shown in fig. 1, the determining, according to each of the outgoing phase fluctuation information, a plurality of first excitation frequencies to be detected among a plurality of second excitation frequencies to be detected includes:
determining the emergent phase fluctuation information with the minimum value from the emergent phase fluctuation information, and determining the second to-be-detected excitation frequency corresponding to the emergent phase fluctuation information as the third to-be-detected excitation frequency;
determining a second excitation frequency to be detected, which is located between the triple degeneracy point frequency and the third excitation frequency to be detected, and at most two second excitation frequencies to be detected, which exceed the third excitation frequency to be detected and are adjacent to the third excitation frequency to be detected, as first excitation frequencies to be detected.
In the embodiment of the invention, the first excitation frequency to be detected can be rapidly determined according to the emergent phase fluctuation information with the minimum value, so that the calculation resources are further saved, the calculation speed is improved, and the target excitation frequency can be more rapidly found.
According to the distribution diagram of the outgoing phase fluctuation of fig. 7, it can be approximately determined that the frequency range where the first excitation frequency to be detected is located is 0.542-0.550, wherein the third excitation frequency to be detected is 0.546, and thus the first excitation frequency to be detected can be determined to be 0.542-0.547.
Fig. 8 is a schematic diagram of a model for calculating a distribution of transmittance according to an incident angle of an electromagnetic wave, wherein a middle square region in fig. 8 is the photonic crystal shown in fig. 6, and square regions on left and right sides are air. Electromagnetic waves are incident from the left side, and the distribution of transmittance according to the incident angle of the electromagnetic waves (the first to-be-detected excitation frequency of the electromagnetic waves is 0.542-0.547) can be calculated through the model. Fig. 9 is a graph showing a transmittance distribution with respect to an ideal near-zero refractive index material, in which the transmittance distribution with respect to an incident angle of an electromagnetic wave is shown in fig. 10, in which the transmittance distribution with respect to the incident angle of an electromagnetic wave is shown in fig. 11 to 16, in which the photonic crystal is excited by an electromagnetic wave having a first excitation frequency to be detected of 0.542 to 0.547. It should be noted that, the incident angle of the electromagnetic wave ranges from 0 to 90 degrees, and it is known from fresnel's law that only when the electromagnetic wave is perpendicularly incident on the zero refractive index material, the electromagnetic wave passes through the zero refractive index material, otherwise, the electromagnetic wave is reflected by the zero refractive index material.
In one embodiment of the present invention, based on the method for searching the target excitation frequency of the photonic crystal shown in fig. 1, the determining the target excitation frequency according to each incident angle change information includes:
for each piece of incidence angle change information, determining current incidence angle change information with similarity larger than a preset similarity threshold value with the preset incidence angle change information as target incidence angle change information;
and determining a first excitation frequency to be detected corresponding to the target incidence angle change information as a target excitation frequency.
In the embodiment of the invention, the target excitation frequency can be rapidly determined by the fact that the similarity with the preset incident angle change information is larger than the preset similarity threshold value.
As can be seen from fig. 9 to 16, when the photonic crystal is excited by using the electromagnetic wave with triple degeneracy point frequency, the variation distribution of the corresponding incident angle is found to be greatly different from that of the ideal near-zero refractive index material (i.e., the curve difference in fig. 9 and 10 is large), i.e., the transmittance oscillates drastically with the incident angle of the electromagnetic wave; when the photonic crystal is excited by the electromagnetic wave with the first excitation frequency to be detected being 0.542-0.546, the oscillation of the transmissivity along with the incident angle of the electromagnetic wave still exists, but the oscillation degree is gradually weakened; when the photonic crystal is excited by using the electromagnetic wave with the first excitation frequency to be detected of 0.547, the variation distribution of the corresponding incident angle is found to have a small gap from the ideal near-zero refractive index material, so that the first excitation frequency to be detected with the excitation frequency of 0.547 can be determined as the target excitation frequency.
The effect of power synthesis when one or more current sources for a target excitation frequency are embedded in the photonic crystal is described below.
As shown in fig. 17, a schematic diagram of a power synthesis of three current sources ( current sources 1, 2, and 3, respectively) is embedded in the photonic crystal. As shown in fig. 18 to 21, fig. 18 is a schematic diagram of a radiation electric field distribution when a current source (e.g., current source 1) with a target excitation frequency is embedded in the photonic crystal, fig. 19 is a schematic diagram of a radiation electric field distribution when two current sources (e.g., current sources 1 and 2) with a target excitation frequency are embedded in the photonic crystal, fig. 20 is a schematic diagram of a radiation electric field distribution when a current source (e.g., current sources 1, 2 and 3) with a target excitation frequency is embedded in the photonic crystal, and fig. 21 is a schematic diagram of a radiation electric field value distribution shown in fig. 18, 19 and 20. As can be seen from fig. 18 to 21, when the number of current sources increases, the electric field values in the four radiation directions of the photonic crystal are all increasing, thus achieving the power combining effect of the radiation electric field.
As shown in fig. 2 and fig. 3, the embodiment of the invention provides a device where a target excitation frequency searching device of a photonic crystal is located and the target excitation frequency searching device of the photonic crystal. The apparatus embodiments may be implemented by software, or may be implemented by hardware or a combination of hardware and software. In terms of hardware, as shown in fig. 2, a hardware structure diagram of a device where the target excitation frequency searching device for a photonic crystal provided by the embodiment of the present invention is located is shown, where in addition to the processor, the memory, the network interface, and the nonvolatile memory shown in fig. 2, the device where the device is located may generally include other hardware, such as a forwarding chip responsible for processing a packet, and so on. Taking a software implementation as an example, as shown in fig. 3, the device in a logic sense is formed by reading corresponding computer program instructions in a nonvolatile memory into a memory by a CPU of a device where the device is located for operation.
As shown in fig. 3, the target excitation frequency searching device of the photonic crystal provided in this embodiment includes:
an acquisition module 301, configured to acquire triple degenerate point frequencies of a photonic crystal constructed in advance;
a first determining module 302, configured to determine a plurality of first to-be-detected excitation frequencies according to the numerical precision of the triple degenerate point frequencies, where each of the first to-be-detected excitation frequencies is greater than the triple degenerate point frequency;
an obtaining module 303, configured to emit, for each of the first to-be-detected excitation frequencies, electromagnetic waves at the first to-be-detected excitation frequency and at different incident angles to the photonic crystal, to obtain incident angle change information;
and a second determining module 304, configured to determine a target excitation frequency according to each incident angle change information, where an electromagnetic wave having the target excitation frequency cannot be incident on the photonic crystal at a set angle.
In the embodiment of the present invention, the obtaining module 301 may be configured to perform step 101 in the above method embodiment, and the first determining module 302 may be configured to perform step 102 in the above method embodiment; the obtaining module 303 may be configured to perform step 103 in the above-described method embodiment; the second determination module 304 may be used to perform step 104 in the method embodiments described above.
In one embodiment of the present invention, the first determining module 302 is configured to perform the following operations:
determining a plurality of second excitation frequencies to be detected according to the numerical precision of the triple degenerated dot frequency, wherein the second excitation frequencies to be detected comprise the first excitation frequencies to be detected;
for each second excitation frequency to be detected, emitting electromagnetic waves with the second excitation frequency to be detected from the photonic crystal to obtain emission phase fluctuation information;
and determining a plurality of first to-be-detected excitation frequencies from the plurality of second to-be-detected excitation frequencies according to the emergent phase fluctuation information.
In one embodiment of the present invention, the first determining module 302 is configured to, when executing the determining of the plurality of first to-be-detected excitation frequencies from the plurality of second to-be-detected excitation frequencies according to each of the outgoing phase fluctuation information, execute the following operations:
determining the emergent phase fluctuation information with the minimum value from the emergent phase fluctuation information, and determining the second to-be-detected excitation frequency corresponding to the emergent phase fluctuation information as the third to-be-detected excitation frequency;
determining a second excitation frequency to be detected, which is located between the triple degeneracy point frequency and the third excitation frequency to be detected, and at most two second excitation frequencies to be detected, which exceed the third excitation frequency to be detected and are adjacent to the third excitation frequency to be detected, as first excitation frequencies to be detected.
In one embodiment of the present invention, the second determining module 304 is configured to perform the following operations:
for each piece of incidence angle change information, determining current incidence angle change information with similarity larger than a preset similarity threshold value with the preset incidence angle change information as target incidence angle change information;
and determining a first excitation frequency to be detected corresponding to the target incidence angle change information as a target excitation frequency.
It will be appreciated that the structure illustrated in the embodiments of the present invention does not constitute a specific limitation on the target excitation frequency searching means of the photonic crystal. In other embodiments of the invention, the target excitation frequency lookup means of the photonic crystal may comprise more or less components than shown, or certain components may be combined, or certain components may be split, or different arrangements of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.
The content of information interaction and execution process between the modules in the device is based on the same conception as the embodiment of the method of the present invention, and specific content can be referred to the description in the embodiment of the method of the present invention, which is not repeated here.
The embodiment of the invention also provides a target excitation frequency searching device of the photonic crystal, which comprises the following steps: at least one memory and at least one processor;
the at least one memory for storing a machine readable program;
the at least one processor is configured to invoke the machine-readable program to perform a target excitation frequency lookup method of a photonic crystal in any embodiment of the present invention.
The embodiment of the invention also provides a computer readable medium, wherein the computer readable medium is stored with computer instructions, and the computer instructions, when executed by a processor, cause the processor to execute the target excitation frequency searching method of the photonic crystal in any embodiment of the invention.
Specifically, a system or apparatus provided with a storage medium on which a software program code realizing the functions of any of the above embodiments is stored, and a computer (or CPU or MPU) of the system or apparatus may be caused to read out and execute the program code stored in the storage medium.
In this case, the program code itself read from the storage medium may realize the functions of any of the above-described embodiments, and thus the program code and the storage medium storing the program code form part of the present invention.
Examples of the storage medium for providing the program code include a floppy disk, a hard disk, a magneto-optical disk, an optical disk (e.g., CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD+RW), a magnetic tape, a nonvolatile memory card, and a ROM. Alternatively, the program code may be downloaded from a server computer by a communication network.
Further, it should be apparent that the functions of any of the above-described embodiments may be implemented not only by executing the program code read out by the computer, but also by causing an operating system or the like operating on the computer to perform part or all of the actual operations based on the instructions of the program code.
Further, it is understood that the program code read out by the storage medium is written into a memory provided in an expansion board inserted into a computer or into a memory provided in an expansion module connected to the computer, and then a CPU or the like mounted on the expansion board or the expansion module is caused to perform part and all of actual operations based on instructions of the program code, thereby realizing the functions of any of the above embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The target excitation frequency searching method of the photonic crystal is characterized by comprising the following steps of:
obtaining triple degenerated point frequency of a pre-constructed photonic crystal;
determining a plurality of first to-be-detected excitation frequencies according to the numerical precision of the triple degeneracy point frequency, wherein each first to-be-detected excitation frequency is larger than the triple degeneracy point frequency;
for each first to-be-detected excitation frequency, emitting electromagnetic waves at the first to-be-detected excitation frequency and under different incidence angles to the photonic crystal to obtain incidence angle change information;
and determining a target excitation frequency according to each incidence angle change information, wherein the electromagnetic wave with the target excitation frequency cannot be incident to the photonic crystal under a set angle.
2. The method of claim 1, wherein determining a plurality of first excitation frequencies to be detected based on the numerical accuracy of the triple degenerated dot frequencies comprises:
determining a plurality of second excitation frequencies to be detected according to the numerical precision of the triple degenerated dot frequency, wherein the second excitation frequencies to be detected comprise the first excitation frequencies to be detected;
for each second excitation frequency to be detected, emitting electromagnetic waves with the second excitation frequency to be detected from the photonic crystal to obtain emission phase fluctuation information;
and determining a plurality of first to-be-detected excitation frequencies from the plurality of second to-be-detected excitation frequencies according to the emergent phase fluctuation information.
3. The method according to claim 2, wherein said determining a plurality of said first excitation frequencies to be detected among a plurality of said second excitation frequencies to be detected based on each of said outgoing phase fluctuation information comprises:
determining the emergent phase fluctuation information with the minimum value from the emergent phase fluctuation information, and determining the second to-be-detected excitation frequency corresponding to the emergent phase fluctuation information as the third to-be-detected excitation frequency;
determining a second excitation frequency to be detected, which is located between the triple degeneracy point frequency and the third excitation frequency to be detected, and at most two second excitation frequencies to be detected, which exceed the third excitation frequency to be detected and are adjacent to the third excitation frequency to be detected, as first excitation frequencies to be detected.
4. A method according to any one of claims 1-3, wherein said determining a target excitation frequency from each of said incident angle variation information comprises:
for each piece of incidence angle change information, determining current incidence angle change information with similarity larger than a preset similarity threshold value with the preset incidence angle change information as target incidence angle change information;
and determining a first excitation frequency to be detected corresponding to the target incidence angle change information as a target excitation frequency.
5. A target excitation frequency lookup apparatus for a photonic crystal, comprising:
the acquisition module is used for acquiring triple degeneracy point frequency of the photon crystal constructed in advance;
the first determining module is used for determining a plurality of first to-be-detected excitation frequencies according to the numerical precision of the triple degenerated point frequencies, wherein each first to-be-detected excitation frequency is larger than the triple degenerated point frequency;
the obtaining module is used for transmitting electromagnetic waves at the first to-be-detected excitation frequency and at different incidence angles to the photonic crystal for each first to-be-detected excitation frequency to obtain incidence angle change information;
and the second determining module is used for determining a target excitation frequency according to the incidence angle change information, wherein the electromagnetic wave with the target excitation frequency cannot be incident to the photonic crystal under a set angle.
6. The apparatus of claim 5, wherein the first determining module is configured to:
determining a plurality of second excitation frequencies to be detected according to the numerical precision of the triple degenerated dot frequency, wherein the second excitation frequencies to be detected comprise the first excitation frequencies to be detected;
for each second excitation frequency to be detected, emitting electromagnetic waves with the second excitation frequency to be detected from the photonic crystal to obtain emission phase fluctuation information;
and determining a plurality of first to-be-detected excitation frequencies from the plurality of second to-be-detected excitation frequencies according to the emergent phase fluctuation information.
7. The apparatus of claim 6, wherein the first determining module, when performing the determining of the plurality of first frequencies to be detected among the plurality of second frequencies to be detected based on each of the outgoing phase fluctuation information, is configured to perform the following operations:
determining the emergent phase fluctuation information with the minimum value from the emergent phase fluctuation information, and determining the second to-be-detected excitation frequency corresponding to the emergent phase fluctuation information as the third to-be-detected excitation frequency;
determining a second excitation frequency to be detected, which is located between the triple degeneracy point frequency and the third excitation frequency to be detected, and at most two second excitation frequencies to be detected, which exceed the third excitation frequency to be detected and are adjacent to the third excitation frequency to be detected, as first excitation frequencies to be detected.
8. The apparatus according to any one of claims 5-7, wherein the second determining module is configured to:
for each piece of incidence angle change information, determining current incidence angle change information with similarity larger than a preset similarity threshold value with the preset incidence angle change information as target incidence angle change information;
and determining a first excitation frequency to be detected corresponding to the target incidence angle change information as a target excitation frequency.
9. A target excitation frequency lookup apparatus for a photonic crystal, comprising: at least one memory and at least one processor;
the at least one memory for storing a machine readable program;
the at least one processor configured to invoke the machine readable program to perform the method of any of claims 1-4.
10. A computer readable medium having stored thereon computer instructions which, when executed by a processor, cause the processor to perform the method of any of claims 1-4.
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