CN112185487A - Target excitation frequency searching method and device of photonic crystal and readable medium - Google Patents
Target excitation frequency searching method and device of photonic crystal and readable medium Download PDFInfo
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Abstract
The invention relates to a target excitation frequency searching method, a target excitation frequency searching device and a readable medium of a photonic crystal, wherein the method comprises the following steps: acquiring triple degenerate point frequency of a photonic crystal constructed in advance; determining a plurality of first to-be-detected excitation frequencies according to the numerical precision of the triple degenerate point frequency, wherein each first to-be-detected excitation frequency is larger than the triple degenerate point frequency; for each first excitation frequency to be detected, emitting electromagnetic waves at the first excitation frequency to be detected and at different incidence angles to the photonic crystal to obtain incidence angle change information; and determining a target excitation frequency according to the incident 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 a target excitation frequency which can better eliminate the propagation phase in the current source propagation process.
Description
Technical Field
The invention relates to the technical field of computers, in particular to a target excitation frequency searching method and device of a photonic crystal and a readable medium.
Background
Zero index materials have nearly zero intrinsic parameters, so that waves propagate in zero index materials without phase change, and such a particular material has many interesting wave-manipulating properties. Zero index materials are classified into single zero index materials and double zero index materials. Single zero index materials are further classified into near-zero dielectric constant materials and near-zero permeability materials. However, since the single-zero refractive index material has only one constitutive parameter close to zero, the impedance of the single-zero refractive index material is out of balance with the impedance of the background field, which is not suitable for practical application. The dual-zero refractive index material, namely the material with two constitutive parameters close to zero, has a limited effective impedance with the background field, and the defect that the single-zero refractive index medium is not practical can be overcome.
In the prior art, these materials can be realized using artificial composite materials consisting of metal resonators or chiral inclusions, but the metal components have losses that impair the high-frequency function. The method for producing the artificial composite material may be, for example: photonic crystals exhibiting dirac-like cone dispersion at finite frequencies in the center of the brillouin zone are designed and fabricated using occasional degeneracy of the energy bands, and such photonic crystal manipulation waves with reasonable dielectric constants have near-zero refractive indices at dirac-like point frequencies.
Theoretically, when the Brillouin zone center Dirac point-like frequency (corresponding to a triple degeneracy point) in the photonic crystal excites the photonic crystal, the photonic crystal corresponds to an equivalent zero-refractive-index material, and interface radiation waves are equal-phase radiation. However, the interface radiation wave does not exit in an equal phase in practical situations, and therefore, an appropriate 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 above, it is desirable to provide a method, an apparatus and a readable medium for searching a target excitation frequency of a photonic crystal to solve the above-mentioned disadvantages.
Disclosure of Invention
The technical problem to be solved by the invention is how to find a target excitation frequency capable of well eliminating a propagation phase in a current source propagation process, and the invention provides a target excitation frequency finding method and device of a photonic crystal and a readable medium aiming at the defects in the prior art.
In order to solve the above technical problem, the present invention provides a method for searching a target excitation frequency of a photonic crystal, comprising:
acquiring triple degenerate point frequency of a photonic crystal constructed in advance;
determining a plurality of first to-be-detected excitation frequencies according to the numerical precision of the triple degenerate point frequency, wherein each first to-be-detected excitation frequency is larger than the triple degenerate point frequency;
for each first excitation frequency to be detected, emitting electromagnetic waves at the first excitation frequency to be detected and at different incidence angles to the photonic crystal to obtain incidence angle change information;
and determining a target excitation frequency according to the incident angle change information, wherein the electromagnetic wave with the target excitation frequency cannot be incident to the photonic crystal under a set angle.
In a possible implementation manner, the determining a plurality of first to-be-detected excitation frequencies according to the numerical precision of the triple degenerated point frequency includes:
determining a plurality of second excitation frequencies to be detected according to the numerical precision of the triple degenerated point 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 in a plurality of second to-be-detected excitation frequencies according to the emergent phase fluctuation information.
In a possible implementation manner, the determining, according to 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 emergent phase fluctuation information with the minimum value from the emergent phase fluctuation information, and determining a second to-be-detected excitation frequency corresponding to the emergent phase fluctuation information as a third to-be-detected excitation frequency;
and determining a second to-be-detected excitation frequency between the triple degenerate point frequency and the third to-be-detected excitation frequency, and at most two second to-be-detected excitation frequencies which exceed the third to-be-detected excitation frequency and are adjacent to the third to-be-detected excitation frequency as a first to-be-detected excitation frequency.
In a possible implementation manner, the determining a target excitation frequency according to each incident angle variation information includes:
for each incident angle change information, determining the current incident angle change information with the similarity greater than a preset similarity threshold value with the preset incident angle change information as target incident angle change information;
and determining a first to-be-detected excitation frequency 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 degenerate point frequencies of the photonic 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 degenerate point frequency, wherein each first to-be-detected excitation frequency is greater than the triple degenerate point frequency;
the obtaining module is used for emitting electromagnetic waves at the first to-be-detected excitation frequency and at different incidence angles to the photonic crystal aiming at 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 incident angle change information, wherein the electromagnetic wave with the target excitation frequency cannot be incident to the photonic crystal under a set angle.
In a 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 point 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 in a plurality of second to-be-detected excitation frequencies according to the emergent phase fluctuation information.
In a possible implementation manner, when determining, according to the outgoing phase fluctuation information, a plurality of first to-be-detected excitation frequencies among a plurality of second to-be-detected excitation frequencies, the first determining module is configured to perform the following operations:
determining emergent phase fluctuation information with the minimum value from the emergent phase fluctuation information, and determining a second to-be-detected excitation frequency corresponding to the emergent phase fluctuation information as a third to-be-detected excitation frequency;
and determining a second to-be-detected excitation frequency between the triple degenerate point frequency and the third to-be-detected excitation frequency, and at most two second to-be-detected excitation frequencies which exceed the third to-be-detected excitation frequency and are adjacent to the third to-be-detected excitation frequency as a first to-be-detected excitation frequency.
In a possible implementation manner, the second determining module is configured to perform the following operations:
for each incident angle change information, determining the current incident angle change information with the similarity greater than a preset similarity threshold value with the preset incident angle change information as target incident angle change information;
and determining a first to-be-detected excitation frequency 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 to store 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 the method as described above.
The implementation of the target excitation frequency searching method, the device and the readable medium of the photonic crystal has 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 precision of the triple degenerate point frequency, wherein each first to-be-detected excitation frequency is greater than the triple degenerate point frequency; then, aiming at each first excitation frequency to be detected, emitting electromagnetic waves at the first excitation frequency to be detected and at different incidence angles to the photonic crystal to obtain incidence angle change information; and finally, determining the target excitation frequency according to the change information of each incident angle, wherein the electromagnetic wave with the target excitation frequency cannot be incident to the photonic crystal under a 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 well eliminating the propagation phase in the current source propagation process can be found by determining a plurality of first to-be-detected excitation frequencies which are all greater than the triple degenerate point frequency and according to the incident angle variation information of the electromagnetic wave corresponding to each first to-be-detected excitation frequency; when a plurality of current sources are embedded into 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 where a target excitation frequency searching device of a photonic crystal according to an embodiment of the present invention is located;
FIG. 3 is a schematic diagram of a target excitation frequency searching apparatus for a photonic crystal according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a photonic crystal provided in accordance with an embodiment of the present invention;
FIG. 5 is a schematic illustration of the radiated electric field distribution after embedding a current source in an ideal near-zero index material, according to an embodiment of the present invention;
FIG. 6 is a schematic illustration of the distribution of radiated electric fields after embedding a current source of triple degenerate point frequency in the photonic crystal of FIG. 4 in accordance with an embodiment of the present invention;
FIG. 7 is a diagram illustrating the distribution of the outgoing phase fluctuation of the electromagnetic wave with the second excitation frequency to be detected exiting from the photonic crystal shown in FIG. 4 according to an embodiment of the present invention;
FIG. 8 is a diagram illustrating a model for calculating the distribution of transmittance with the incident angle of an electromagnetic wave according to an embodiment of the present invention;
FIG. 9 is a graph showing the transmittance of an ideal near-zero index material as a function of the incident angle of an electromagnetic wave according to an embodiment of the present invention;
FIG. 10 is a graph showing the transmittance as a function of the incident angle of an electromagnetic wave when a photonic crystal is excited by an electromagnetic wave having a frequency of a triple degenerate point according to an embodiment of the present invention;
FIG. 11 is a diagram illustrating the transmittance distribution with the incident angle of an electromagnetic wave when an electromagnetic wave with a second excitation frequency to be detected of 0.542 is used to excite a photonic crystal according to an embodiment of the present invention;
FIG. 12 is a diagram illustrating the distribution of transmittance along with the incident angle of an electromagnetic wave when an electromagnetic wave with a second excitation frequency to be detected of 0.543 is used to excite a photonic crystal according to an embodiment of the present invention;
FIG. 13 is a diagram illustrating the transmittance distribution with the incident angle of an electromagnetic wave when an electromagnetic wave with a second excitation frequency to be detected of 0.544 is used to excite a photonic crystal according to an embodiment of the present invention;
FIG. 14 is a diagram illustrating the transmittance distribution with the incident angle of an electromagnetic wave when a photonic crystal is excited by an electromagnetic wave with a second to-be-detected excitation frequency of 0.545 according to an embodiment of the present invention;
FIG. 15 is a diagram illustrating the distribution of transmittance with the incident angle of an electromagnetic wave when the photonic crystal is excited by the electromagnetic wave with the second to-be-detected excitation frequency of 0.546, according to an embodiment of the present invention;
FIG. 16 is a graph showing the transmittance distribution as a function of the incident angle of an electromagnetic wave when a photonic crystal is excited by an electromagnetic wave with a second to-be-detected excitation frequency of 0.547, according to an embodiment of the present invention;
FIG. 17 is a model schematic diagram of power synthesis in the photonic crystal of FIG. 4 provided by an embodiment of the present invention;
FIG. 18 is a schematic illustration of the distribution of the radiated electric field when a current source at the target excitation frequency is embedded in the photonic crystal of FIG. 4 in accordance with an embodiment of the present invention;
FIG. 19 is a schematic illustration of the distribution of radiated electric fields when two current sources at the target excitation frequency are embedded in the photonic crystal of FIG. 4 in accordance with one embodiment of the present invention;
FIG. 20 is a schematic illustration of the distribution of the radiated electric field when three current sources at the target excitation frequency are embedded in the photonic crystal of FIG. 4 in accordance with one embodiment of the present invention;
fig. 21 is a distribution diagram of the radiation electric field values shown in fig. 18, 19 and 20 according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, a method for finding a target excitation frequency of a photonic crystal according to an embodiment of the present invention includes:
101, acquiring triple degenerate point frequency of a pre-constructed photonic crystal;
103, transmitting electromagnetic waves at the first to-be-detected excitation frequency and at different incidence angles to the photonic crystal aiming at each first to-be-detected excitation frequency to obtain incidence angle change information;
and 104, determining a target excitation frequency according to the incident 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, a triple degenerate point frequency of a photonic 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 triple degenerate point frequency, wherein each first to-be-detected excitation frequency is greater than the triple degenerate point frequency; then, aiming at each first excitation frequency to be detected, emitting electromagnetic waves at the first excitation frequency to be detected and at different incidence angles to the photonic crystal to obtain incidence angle change information; and finally, determining the target excitation frequency according to the change information of each incident angle, wherein the electromagnetic wave with the target excitation frequency cannot be incident to the photonic crystal under a 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 well eliminating the propagation phase in the current source propagation process can be found by determining a plurality of first to-be-detected excitation frequencies which are all greater than the triple degenerate point frequency and according to the incident angle variation information of the electromagnetic wave corresponding to each first to-be-detected excitation frequency; when a plurality of current sources are embedded into 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 is understood that, according to band theory, it is known that: when the excitation frequency to be detected is less than the triple degenerated 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 at this time. Therefore, the excitation frequency to be detected needs to be greater than the triple degenerated point frequency, so that a target excitation frequency capable of well eliminating the propagation phase in the current source propagation process can be found.
The inventive concept of the present invention is explained below with reference to actual experimental data.
As shown in fig. 4, the parameters of the pre-constructed photonic crystal are as follows: the lattice constant is a, the radius of the dielectric cylinder is R, wherein R is 0.2a, the dielectric constant of the dielectric cylinder is 12.5, the effective magnetic permeability is 1, and the dielectric cylinder is embedded in air. The structure of a triple degenerated point is realized at a Brillouin zone point by utilizing the photonic crystal, the triple degenerated point is obtained by an effective medium theory, the frequency of the triple degenerated point corresponds to the excitation frequency with the effective dielectric constant and the effective magnetic permeability of the photonic crystal being zero at the same time, and a dimensionless numerical value of the frequency of the triple degenerated point is 0.541 through calculation.
As shown in fig. 5, fig. 5 illustrates an ideal near-zero refractive index material (i.e., a relative dielectric constant of 10)-6Relative permeability of mu 10-6) Is embedded with a radiation electric field distribution diagram of a current source (e.g. 1A).
As shown in fig. 6, based on the photonic crystal shown in fig. 4, the size of the photonic crystal in fig. 6 is 20a × 20a (i.e. having 400 dielectric cylinders, while 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 the distribution of the radiation electric field when the photonic crystal is excited by an electromagnetic wave with a triple degenerate point frequency of 0.541. In comparison with an ideal near-zero index material, it was found that the photonic crystal of the equivalent near-zero index material excited by an electromagnetic wave having a triple degenerate point frequency of 0.541 did not emit plane wave type radiation at the interface and was significantly different from the ideal case.
Based on the above analysis, it can be seen that a target excitation frequency needs to be searched to better eliminate the propagation phase in the current source propagation process, i.e. 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 an embodiment of the present invention, on the basis of the method for finding a target excitation frequency of a photonic crystal shown in fig. 1, the determining a plurality of first to-be-detected excitation frequencies according to the numerical precision of the triple degenerate point frequency includes:
determining a plurality of second excitation frequencies to be detected according to the numerical precision of the triple degenerated point 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 in a plurality of second to-be-detected excitation frequencies according to the emergent phase fluctuation information.
In the embodiment of the invention, the determination of a plurality of first to-be-detected excitation frequencies in a plurality of second to-be-detected excitation frequencies can be facilitated by the outgoing phase fluctuation information of the electromagnetic wave of each second to-be-detected excitation frequency, so that the calculation resources are saved, the calculation speed is increased, and the target excitation frequency can be found more quickly.
Following the foregoing example, the numerical precision of a triple degenerate point frequency of 0.541 is 10-3Therefore, a plurality of second excitation frequencies to be detected, which may be, for example, 0.541-0.550, or 0.541-0.560, or of course, may be in other ranges, may be determined according to the numerical accuracy. As shown in fig. 7, the second excitation frequency to be detected provided by the embodiment of the present invention is selected to be in a range of 0.542 to 0.572, that is, the second excitation frequency to be detected may be 0.542, 0.543, 0.544 … … 0.572.572.
In an embodiment of the present invention, on the basis of the method for finding a target excitation frequency of a photonic crystal shown in fig. 1, the determining, according to the information of each of the outgoing phase fluctuations, a plurality of first excitation frequencies to be detected among a plurality of second excitation frequencies to be detected includes:
determining emergent phase fluctuation information with the minimum value from the emergent phase fluctuation information, and determining a second to-be-detected excitation frequency corresponding to the emergent phase fluctuation information as a third to-be-detected excitation frequency;
and determining a second to-be-detected excitation frequency between the triple degenerate point frequency and the third to-be-detected excitation frequency, and at most two second to-be-detected excitation frequencies which exceed the third to-be-detected excitation frequency and are adjacent to the third to-be-detected excitation frequency as a first to-be-detected excitation frequency.
In the embodiment of the invention, the first excitation frequency to be detected can be quickly determined according to the emergent phase fluctuation information with the minimum numerical value, so that the calculation resource is further saved, the calculation speed is increased, and the target excitation frequency can be searched more quickly.
According to the distribution diagram of the emergent phase fluctuation of fig. 7, it can be roughly determined that the first to-be-detected excitation frequency is located in the frequency range of 0.542-0.550, wherein the third to-be-detected excitation frequency is 0.546, and therefore, the first to-be-detected excitation frequency 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, in which a central square region in fig. 8 is the photonic crystal shown in fig. 6, and left and right square regions are air. The electromagnetic wave is incident from the left side, and the variation distribution of the transmissivity along with the incident angle of the electromagnetic wave (the first to-be-detected excitation frequency of the electromagnetic wave is 0.542-0.547) can be calculated through the model. Fig. 9 is a graph showing a distribution of transmittance according to a change in incident angle of an electromagnetic wave in an ideal near-zero refractive index material, fig. 10 is a graph showing a distribution of transmittance according to a change in incident angle of an electromagnetic wave when a photonic crystal is excited by an electromagnetic wave having a triple degenerate point frequency, and fig. 11 to 16 are graphs showing a distribution of transmittance according to a change in incident angle of an electromagnetic wave when a photonic crystal is excited by an electromagnetic wave having a first to-be-detected excitation frequency of 0.542 to 0.547. It should be noted that the variation range of the incident angle of the electromagnetic wave is 0 to 90 degrees, and it can be known from fresnel's law that only when the electromagnetic wave is perpendicularly incident to the zero-refractive-index material, the electromagnetic wave is transmitted through the zero-refractive-index material, otherwise, the electromagnetic wave is reflected by the zero-refractive-index material.
In an embodiment of the present invention, on the basis of the method for finding a target excitation frequency of a photonic crystal shown in fig. 1, the determining a target excitation frequency according to the information about the change of each incident angle includes:
for each incident angle change information, determining the current incident angle change information with the similarity greater than a preset similarity threshold value with the preset incident angle change information as target incident angle change information;
and determining a first to-be-detected excitation frequency corresponding to the target incidence angle change information as a target excitation frequency.
In the embodiment of the invention, the similarity between the preset incident angle change information and the preset similarity threshold value is larger than the preset similarity threshold value, so that the target excitation frequency can be quickly determined.
As can be seen from fig. 9 to 16, when the photonic crystal is excited by the electromagnetic wave with the triple degenerate point frequency, the variation distribution of the 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 with the incident angle of the electromagnetic wave; when the photonic crystal is excited by the electromagnetic wave with the first to-be-detected excitation frequency of 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 the electromagnetic wave with the first to-be-detected excitation frequency of 0.547, the difference between the change distribution of the corresponding incident angle and the ideal near-zero refractive index material is small, so that the first to-be-detected excitation frequency with the excitation frequency of 0.547 can be determined as the target excitation frequency.
The power combining effect of embedding one or more current sources at the target excitation frequency in the photonic crystal will be described.
As shown in fig. 17, a model schematic diagram of power synthesis of three current sources ( current sources 1, 2 and 3, respectively) embedded in the photonic crystal is shown. As shown in fig. 18 to 21, fig. 18 is a schematic view of a radiation electric field distribution when a current source (for example, current source 1) having a target excitation frequency is embedded in the photonic crystal, fig. 19 is a schematic view of a radiation electric field distribution when two current sources (for example, current sources 1 and 2) having a target excitation frequency are embedded in the photonic crystal, fig. 20 is a schematic view of a radiation electric field distribution when a current source (for example, current sources 1, 2, and 3) having a target excitation frequency is embedded in the photonic crystal, and fig. 21 is a schematic view 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 is increased, the electric field values in the four radiation directions of the photonic crystal are increased, so that the power combining effect of the radiation electric fields is achieved.
As shown in fig. 2 and fig. 3, the embodiment of the present invention provides an apparatus in which a target excitation frequency search device of a photonic crystal is located and a target excitation frequency search device of a photonic crystal. The device embodiments may be implemented by software, or by hardware, or by a combination of hardware and software. From a hardware level, as shown in fig. 2, a hardware structure diagram of a device where a target excitation frequency search apparatus of a photonic crystal according to an 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 apparatus is located may also include other hardware, such as a forwarding chip responsible for processing a packet. Taking a software implementation as an example, as shown in fig. 3, as a logical apparatus, the apparatus is formed by reading, by a CPU of a device in which the apparatus is located, corresponding computer program instructions in a non-volatile memory into a memory for execution.
As shown in fig. 3, the apparatus for finding a target excitation frequency of a photonic crystal provided in this embodiment includes:
an obtaining module 301, configured to obtain a triple degenerate point frequency of a pre-constructed photonic crystal;
a first determining module 302, configured to determine a plurality of first to-be-detected excitation frequencies according to numerical precision of the triple degenerate point frequency, where each of the first to-be-detected excitation frequencies is greater than the triple degenerate point frequency;
an obtaining module 303, configured to, for each first excitation frequency to be detected, emit electromagnetic waves at the first excitation frequency to be detected and at different incidence angles to the photonic crystal, so as to obtain incidence angle change information;
a second determining module 304, configured to determine a target excitation frequency according to each incident angle variation information, where the electromagnetic wave with the target excitation frequency cannot be incident on the photonic crystal at a set angle.
In this embodiment of the present invention, the obtaining module 301 may be configured to perform step 101 in the foregoing method embodiment, and the first determining module 302 may be configured to perform step 102 in the foregoing method embodiment; the obtaining module 303 may be configured to perform step 103 in the above method embodiment; the second determination module 304 may be used to perform step 104 in the above-described method embodiments.
In an 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 point 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 in a plurality of second to-be-detected excitation frequencies according to the emergent phase fluctuation information.
In an embodiment of the present invention, when determining a plurality of first to-be-detected excitation frequencies among a plurality of second to-be-detected excitation frequencies according to each piece of exit phase fluctuation information, the first determining module 302 is configured to:
determining emergent phase fluctuation information with the minimum value from the emergent phase fluctuation information, and determining a second to-be-detected excitation frequency corresponding to the emergent phase fluctuation information as a third to-be-detected excitation frequency;
and determining a second to-be-detected excitation frequency between the triple degenerate point frequency and the third to-be-detected excitation frequency, and at most two second to-be-detected excitation frequencies which exceed the third to-be-detected excitation frequency and are adjacent to the third to-be-detected excitation frequency as a first to-be-detected excitation frequency.
In an embodiment of the present invention, the second determining module 304 is configured to perform the following operations:
for each incident angle change information, determining the current incident angle change information with the similarity greater than a preset similarity threshold value with the preset incident angle change information as target incident angle change information;
and determining a first to-be-detected excitation frequency corresponding to the target incidence angle change information as a target excitation frequency.
It is understood that the illustrated structure of the embodiment of the present invention does not constitute a specific limitation on the target excitation frequency finding device of the photonic crystal. In other embodiments of the present invention, the target excitation frequency finding means of the photonic crystal may comprise more or fewer components than shown, or some components may be combined, some components may be split, or a different arrangement of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.
Because the content of information interaction, execution process, and the like among the modules in the device is based on the same concept as the method embodiment of the present invention, specific content can be referred to the description in the method embodiment of the present invention, and is not described herein again.
The embodiment of 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 to store a machine readable program;
the at least one processor is configured to invoke the machine readable program to perform a target excitation frequency search method for a photonic crystal according to any embodiment of the present invention.
Embodiments of the present invention further provide a computer-readable medium, on which computer instructions are stored, and when executed by a processor, the computer instructions cause the processor to execute a target excitation frequency searching method for a photonic crystal in any embodiment of the present invention.
Specifically, a system or an apparatus equipped with a storage medium on which software program codes that realize the functions of any of the above-described embodiments are stored may be provided, and a computer (or a CPU or MPU) of the system or the apparatus is caused to read out and execute the program codes stored in the storage medium.
In this case, the program code itself read from the storage medium can realize the functions of any of the above-described embodiments, and thus the program code and the storage medium storing the program code constitute a part of the present invention.
Examples of the storage medium for supplying 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 via a communications network.
Further, it should be clear that the functions of any one 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 a part or all of the actual operations based on instructions of the program code.
Further, it is to be understood that the program code read out from the storage medium is written to a memory provided in an expansion board inserted into the computer or to a memory provided in an expansion module connected to the computer, and then causes a CPU or the like mounted on the expansion board or the expansion module to perform part or all of the actual operations based on instructions of the program code, thereby realizing the functions of any of the above-described embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A target excitation frequency searching method of a photonic crystal is characterized by comprising the following steps:
acquiring triple degenerate point frequency of a photonic crystal constructed in advance;
determining a plurality of first to-be-detected excitation frequencies according to the numerical precision of the triple degenerate point frequency, wherein each first to-be-detected excitation frequency is larger than the triple degenerate point frequency;
for each first excitation frequency to be detected, emitting electromagnetic waves at the first excitation frequency to be detected and at different incidence angles to the photonic crystal to obtain incidence angle change information;
and determining a target excitation frequency according to the incident 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 according to claim 1, wherein the determining a plurality of first to-be-detected excitation frequencies according to the numerical precision of the triple degenerate point frequency comprises:
determining a plurality of second excitation frequencies to be detected according to the numerical precision of the triple degenerated point 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 in a plurality of second to-be-detected excitation frequencies according to the emergent phase fluctuation information.
3. The method according to claim 2, wherein determining a plurality of the first to-be-detected excitation frequencies among a plurality of the second to-be-detected excitation frequencies according to each of the emergent phase fluctuation information comprises:
determining emergent phase fluctuation information with the minimum value from the emergent phase fluctuation information, and determining a second to-be-detected excitation frequency corresponding to the emergent phase fluctuation information as a third to-be-detected excitation frequency;
and determining a second to-be-detected excitation frequency between the triple degenerate point frequency and the third to-be-detected excitation frequency, and at most two second to-be-detected excitation frequencies which exceed the third to-be-detected excitation frequency and are adjacent to the third to-be-detected excitation frequency as a first to-be-detected excitation frequency.
4. The method according to any one of claims 1-3, wherein determining a target excitation frequency from each of the incident angle variation information comprises:
for each incident angle change information, determining the current incident angle change information with the similarity greater than a preset similarity threshold value with the preset incident angle change information as target incident angle change information;
and determining a first to-be-detected excitation frequency corresponding to the target incidence angle change information as a target excitation frequency.
5. A target excitation frequency finding apparatus for a photonic crystal, comprising:
the acquisition module is used for acquiring triple degenerate point frequencies of the photonic 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 degenerate point frequency, wherein each first to-be-detected excitation frequency is greater than the triple degenerate point frequency;
the obtaining module is used for emitting electromagnetic waves at the first to-be-detected excitation frequency and at different incidence angles to the photonic crystal aiming at 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 incident 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 point 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 in a plurality of second to-be-detected excitation frequencies according to the emergent phase fluctuation information.
7. The apparatus according to claim 6, wherein the first determining module, when performing the determining of the plurality of first to-be-detected excitation frequencies among the plurality of second to-be-detected excitation frequencies according to the respective outgoing phase fluctuation information, is configured to perform the following operations:
determining emergent phase fluctuation information with the minimum value from the emergent phase fluctuation information, and determining a second to-be-detected excitation frequency corresponding to the emergent phase fluctuation information as a third to-be-detected excitation frequency;
and determining a second to-be-detected excitation frequency between the triple degenerate point frequency and the third to-be-detected excitation frequency, and at most two second to-be-detected excitation frequencies which exceed the third to-be-detected excitation frequency and are adjacent to the third to-be-detected excitation frequency as a first to-be-detected excitation frequency.
8. The apparatus according to any of claims 5-7, wherein the second determining module is configured to:
for each incident angle change information, determining the current incident angle change information with the similarity greater than a preset similarity threshold value with the preset incident angle change information as target incident angle change information;
and determining a first to-be-detected excitation frequency corresponding to the target incidence angle change information as a target excitation frequency.
9. A target excitation frequency finding apparatus for a photonic crystal, comprising: at least one memory and at least one processor;
the at least one memory to store 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 one of claims 1-4.
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