CN113568076A - Double-function superlens and optical rotation detection method - Google Patents
Double-function superlens and optical rotation detection method Download PDFInfo
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Abstract
The invention discloses a double-function super lens and a method for detecting optical rotation, wherein the double-function super lens comprises: the lens comprises a super lens body and an end face connected with the super lens body; the superlens comprises a first dielectric substance microstructure and a second dielectric substance microstructure, wherein the first dielectric substance microstructure is used for carrying out center focusing on emergent light of the end face, and the second dielectric substance microstructure is used for carrying out off-axis focusing on the emergent light of the end face. The dual-function super lens can simultaneously realize two functions of central focusing and off-axis focusing, so that the problem that most super lenses for adjusting the propagation phase adjusting value by utilizing a dielectric microstructure only have the function of central focusing and have single function in the prior art can be solved.
Description
Technical Field
The invention relates to the field of optics, in particular to a double-function super lens and a light rotation detection method.
Background
The superlenses currently available on the market are largely divided into two types: one is a superlens for adjusting a geometric phase adjustment value based on a metal microstructure; the other is a superlens which uses a dielectric microstructure to adjust the propagation phase adjustment value. However, the former can only use the rotation property of the converted light to provide the phase adjustment value change, such as converting from left-handed light to right-handed light or from right-handed light to left-handed light, and thus the application range is limited. And the loss of the metal microstructure is very large, so that the high-efficiency regulation and control of light are difficult to realize. The latter can maintain optical rotation property by using propagation phase adjustment value regulation, and dielectric loss is relatively small. Therefore, the superlens using the dielectric microstructure to adjust the propagation phase adjustment value is more widely applied, however, most of the superlenses using the dielectric microstructure to adjust the propagation phase adjustment value have a center focusing function and a single function.
Thus, there is still a need for improvement and development of the prior art.
Disclosure of Invention
The present invention is directed to provide a dual-function superlens and a method for detecting optical rotation, which are used to solve the above-mentioned drawbacks of the prior art, and aims to solve the problem that most superlenses that use dielectric microstructures to adjust propagation phase adjustment values in the prior art only have a function of center focusing, and thus have a single function.
The technical scheme adopted by the invention for solving the problems is as follows:
in a first aspect, an embodiment of the present invention provides a dual-function superlens, where the dual-function superlens includes: the lens comprises an end face and a super lens body connected with the end face;
the super lens body comprises a first dielectric substance microstructure and a second dielectric substance microstructure, wherein the first dielectric substance microstructure is used for carrying out center focusing on emergent light of the end face, and the second dielectric substance microstructure is used for carrying out off-axis focusing on the emergent light of the end face.
In one embodiment, the end face is comprised of a photonic crystal fiber.
In one embodiment, the core mode of the photonic crystal fiber has the characteristic of keeping single mode in the 800nm-1550nm waveband, and the core diameter of the photonic crystal fiber is larger than that of a pure single mode fiber core.
In one embodiment, the first dielectric microstructure comprises a plurality of first micro-units, the second dielectric microstructure comprises a plurality of second micro-units, and the first micro-units and the second micro-units are arranged in regularly repeated groups, wherein each group of the groups comprises the first micro-units and the second micro-units in the same number ratio.
In one embodiment, each of the first micro-cells has a corresponding first propagation phase adjustment value, so as to realize center focusing of emergent light from the end face.
In one embodiment, the first propagation phase adjustment value satisfies formula (1):
and x and y are coordinate data of each first micro unit in the super lens body, f is the focal length of the super lens body, and lambda is the working wavelength of the super lens body.
In one embodiment, each of the second micro-units has a corresponding second propagation phase adjustment value and a corresponding geometric phase adjustment value, so as to realize off-axis focusing of emergent light from the end face.
In one embodiment, the sum of the second propagation phase adjustment value and the geometric phase adjustment value satisfies formula (2), the second propagation phase adjustment value satisfies formula (3), and the geometric phase adjustment value satisfies formula (4):
wherein x and y are eachCoordinate data of a second microcell in the superlens body, wherein x0A distance between the left off-axis focus or the right off-axis focus and the center focus based on off-axis focusing, + corresponding to the left off-axis focus, -corresponding to the right off-axis focus.
In one embodiment, each of the second micro-units has a corresponding rotation angle to reach the geometric phase adjustment value corresponding to each of the second micro-units, wherein the rotation angle is one-half of the geometric phase adjustment value.
In a second aspect, an embodiment of the present invention further provides a method for detecting optical helicity, where the method is applied to the dual-function superlens described in claim 1, and the method includes:
injecting light to be detected into the dual-function super lens to obtain two off-axis focuses generated by the dual-function super lens based on the light to be detected;
acquiring relative light intensity data of the two off-axis focuses;
and determining the rotation data of the emergent light generated by the dual-function superlens based on the light to be detected according to the relative light intensity data.
The invention has the beneficial effects that: the dual-function superlens of the present invention comprises: the lens comprises a super lens body and an end face connected with the super lens body; the superlens comprises a first dielectric substance microstructure and a second dielectric substance microstructure, wherein the first dielectric substance microstructure is used for carrying out center focusing on emergent light of the end face, and the second dielectric substance microstructure is used for carrying out off-axis focusing on the emergent light of the end face. The dual-function super lens can simultaneously realize two functions of central focusing and off-axis focusing, so that the problem that most super lenses for adjusting the propagation phase adjusting value by utilizing a dielectric microstructure only have the function of central focusing and have single function in the prior art can be solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a superlens body according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a superlens provided in an embodiment of the present invention.
FIG. 3 is a parameter diagram of a micro-rectangular bar provided by an embodiment of the present invention.
Fig. 4 is a schematic diagram of the relationship between the propagation phase change and the transmittance of the micro-rectangular rods provided by the embodiment of the invention.
FIG. 5 is a schematic view of an alternative set of micro-rectangular rods provided by an embodiment of the present invention.
FIG. 6 is a schematic diagram of a superlens provided by an embodiment of the present invention for achieving both center focusing and off-axis focusing.
FIG. 7 is a schematic diagram of an optical path of incident light through a superlens according to an embodiment of the present invention.
Fig. 8 is a flowchart illustrating a method for detecting optical rotation according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
The superlenses currently available on the market are largely divided into two types: one is a superlens for adjusting a geometric phase adjustment value based on a metal microstructure; the other is a superlens which uses a dielectric microstructure to adjust the propagation phase adjustment value. However, the former can only use the rotation property of the converted light to provide the phase adjustment value change, such as converting from left-handed light to right-handed light or from right-handed light to left-handed light, and thus the application range is limited. And the loss of the metal microstructure is very large, so that the high-efficiency regulation and control of light are difficult to realize. The latter can maintain optical rotation property by using propagation phase adjustment value regulation, and dielectric loss is relatively small. Therefore, the superlens using the dielectric microstructure to adjust the propagation phase adjustment value is more widely applied, however, most of the superlenses using the dielectric microstructure to adjust the propagation phase adjustment value have a center focusing function and a single function.
In view of the above-mentioned deficiencies of the prior art, the present invention provides a dual function superlens, comprising: the lens comprises a super lens body and an end face connected with the super lens body; the superlens comprises a first dielectric substance microstructure and a second dielectric substance microstructure, wherein the first dielectric substance microstructure is used for carrying out center focusing on emergent light of the end face, and the second dielectric substance microstructure is used for carrying out off-axis focusing on the emergent light of the end face. Because the dual-function superlens can simultaneously realize two functions of central focusing and off-axis focusing (as shown in fig. 6), the problem that most superlenses which utilize dielectric microstructures to adjust propagation phase adjustment values have the function of central focusing and have single function in the prior art can be solved.
As shown in fig. 2, the present embodiment provides a dual function superlens, which includes: the lens comprises a super lens body and an end face connected with the super lens body.
Specifically, the basic element of the dual-function superlens in this embodiment is similar to the conventional superlens, and each has an end surface and a superlens body connected to the end surface. The incident light enters from the end face and then exits from the end face, and then enters the super lens body, and the amplitude, the phase adjusting value, the polarization and the like of the emergent light of the end face are flexibly regulated and controlled by the super lens body. It should be noted that the superlens body in this embodiment is made of a supermaterial, so that the superlens body not only can control the wave fronts of transmitted, reflected and scattered light, but also has the advantages of small size, low cost and high design flexibility.
As shown in fig. 1, the superlens includes a first dielectric microstructure and a second dielectric microstructure, where the first dielectric microstructure is used for performing central focusing on the outgoing light from the end face, and the second dielectric microstructure is used for performing off-axis focusing on the outgoing light from the end face.
In order to realize the function of the dual-function superlens of performing the center focusing and the off-axis focusing simultaneously, the superlens body of the present embodiment is provided with two different dielectric microstructures, i.e., a first dielectric microstructure and a second dielectric microstructure. When the emergent light of the end face enters the super lens body, the first dielectric microstructure can perform central focusing on the emergent light of the end face, and the second dielectric microstructure can perform off-axis focusing on the emergent light of the end face, so that three focuses, namely a central focus, a left off-axis focus and a right off-axis focus (as shown in fig. 6) are obtained.
In one implementation, the end face is comprised of a photonic crystal fiber, as shown in FIG. 2.
In particular, optical fiber is a mature, efficient platform that can be used to guide light and allow high bandwidth optical transmission to enable low attenuation, long distance communications. Photonic crystal fibers are a class of fibers that are created based on photonic crystal properties, most commonly periodic over most of the cross-section, usually as a "cladding" surrounding a core where light is confined. The photonic crystal light can be used as a good platform for integrating the super lens because the photonic crystal light can provide a large-diameter core diameter. Therefore, in this embodiment, the end face of the dual-function superlens is made of the photonic crystal fiber, and is used for receiving and transmitting incident light, that is, the incident light enters from one end of the end face made of the photonic crystal fiber, and then exits from the other end and enters the superlens body for modulation.
In one implementation, the core mold of the photonic crystal fiber has the characteristic of keeping a single mode in a wave band of 800nm-1550nm, and the core diameter of the photonic crystal fiber is larger than that of a pure single mode fiber core.
Specifically, in order to make the working environment of the dual-function superlens more stable and single, the photonic crystal fiber with the end face manufactured by the embodiment is an infinite single-mode photonic crystal fiber. The cut-off single-mode large-mode-field photonic crystal fiber means that the operating wavelength of the photonic crystal fiber is in a single mode at the 800nm-1550nm band, that is, the photonic crystal fiber can only transmit light of one mode (fundamental mode), for example, when the operating wavelength is 1310nm, the single mode is a mode supported by displacement in a fiber core. And below the 800nm-1550nm band, light of various modes (including higher order modes) can be propagated. In addition, the end face of the photonic crystal fiber needs to be a large mode area fiber (LAM), i.e., the core diameter needs to be larger than that of a pure single mode fiber core. In short, the specially designed photonic crystal fiber can become a better plane for integrating the superlens due to the larger core diameter, and the working environment of the superlens becomes stable and single due to the single-mode characteristic.
In one implementation, as shown in fig. 2, the photonic crystal fiber has a plurality of air holes regularly arranged in a cross section, the core diameter of the photonic crystal fiber can be set to 26 μm, the distance between adjacent air holes can be set to 17 μm, and the diameter of a single air hole can be set to 8 μm.
In one implementation, the first dielectric microstructure includes a plurality of first micro-units, the second dielectric microstructure includes a plurality of second micro-units, and the first micro-units and the second micro-units are arranged in regularly repeated groups, wherein each group of the groups includes the first micro-units and the second micro-units in the same number ratio.
Specifically, in the present embodiment, the dielectric microstructures on the superlens body are divided into two types, one type is a first dielectric microstructure, and the other type is a second dielectric microstructure, and each type of dielectric microstructure includes a plurality of small micro units, i.e., a first micro unit and a second micro unit. On the super lens body, the first micro unit and the second micro unit are regularly and alternately arranged, so that a plurality of regularly repeated groups are formed, each group comprises the same number of first micro units and the same number of second micro units, and the ratio of the number of the first micro units to the number of the second micro units in each group is the same.
In one implementation, the number ratio is three to one, i.e., the number of first microcells in each group is three times the number of second microcells.
In one implementation, the first microcell and the second microcell in each of the plurality of groups are arranged in the same manner.
For example, as shown in fig. 1, assuming that each of the groups includes four micro-cells, three of which are first micro-cells and one of which is second micro-cells, the four micro-cells may be arranged in a rectangle, and the second micro-cells are disposed at the upper right corner.
In one implementation manner, each of the plurality of first micro units has a corresponding first propagation phase adjustment value to realize center focusing of the emergent light of the end face.
In order to realize the function of the dual-function superlens of performing center focusing on the emergent light at the end surface, the embodiment needs to separately set the first propagation phase adjustment value of each first micro-unit, and the first propagation phase adjustment value may reflect the change of the propagation phase caused by the emergent light at the end surface passing through each first micro-unit. Specifically, as shown in fig. 6, the dual-function superlens in this embodiment adjusts the propagation phase of light in any polarization state, so as to form a central focus without changing the polarization state.
In one implementation, since the position of each first microcell on the superlens body is different, it is necessary to calculate their first propagation phase adjustment values separately for the coordinate data of each first microcell. The specific calculation method is shown in the following formula (1):
and x and y are coordinate data of each first micro unit in the super lens body, f is the focal length of the super lens body, and lambda is the working wavelength of the super lens body.
In the actual process of manufacturing the dual-function super lens, a group of candidate micro-rectangular rods may be preset in this embodiment, where the group of candidate micro-rectangular rods includes a plurality of micro-rectangular rods, propagation phase adjustment values corresponding to the plurality of micro-rectangular rods are different, and the distribution of the propagation phase adjustment values of the plurality of micro-rectangular rods needs to cover the entire 2 pi interval. The distribution of the propagation phase adjustment values of the group of alternative micro-rectangular rods can cover the whole 2 pi interval, and light in any polarization state can be decomposed into polarization in the x and y directions, so that the group of alternative micro-rectangular rods can realize phase adjustment covering the 2 pi interval in the x polarization direction and can realize 2 pi adjustment in the y polarization direction.
In an implementation manner, since the propagation phase changes caused by the micro-rectangular rods with different lengths are different, in designing the set of candidate micro-rectangular rods, the present embodiment needs to determine a parameter set corresponding to each micro-rectangular rod in the set of candidate micro-rectangular rods, where the parameter set includes the length, the width, and the height of the micro-rectangular rod. For convenience of design, the present embodiment may set the height of each micro-rectangular rod to be a uniform value, and the length and width need to be determined according to the relationship between the propagation phase variation of the micro-rectangular rod and the length and width variation thereof (as shown in fig. 3 and 4).
In one implementation manner, the propagation phase adjustment values corresponding to the micro-rectangular rods are sequentially increased according to a preset phase difference.
By way of example, assuming a total of 8 micro-rectangular rods in a set of candidate micro-rectangular rods, 1/4 π, 1/2 π, 3/4 π, 1 π, 5/4 π, 3/2 π, 7/4 π, 2 π, the distribution of the propagation phase adjustment values for these 8 micro-rectangular rods may cover 0-2 π, and sequentially increase with a phase difference of 1/4 π. As shown in fig. 5, the diagram includes 8 black rectangular blocks corresponding to the cross sections of the 8 micro rectangular rods, respectively, and since the distribution of the propagation phase adjustment values of the 8 micro rectangular rods can cover 0-2 pi, phase adjustment covering a 2 pi interval in the x polarization direction can be achieved, and adjustment of 2 pi in the y polarization direction can also be achieved.
According to the formula (1), the present embodiment may calculate the first propagation phase adjustment value of each first microcell, and then determine the first target micro-rectangular bar corresponding to each first microcell in the set of candidate micro-rectangular bars. And aiming at any one first microcell, the first target micro-rectangular rod corresponding to the first microcell is the microcell with the propagation phase adjustment value closest to the corresponding first propagation phase adjustment value in the group of candidate micro-rectangular rods. And then extracting the first target micro-rectangular bar corresponding to each first micro-unit, and placing the first target micro-rectangular bar at the position corresponding to each first micro-unit to obtain the dual-function super lens. In short, the entity of each first microcell needs to be obtained from the set of candidate micro-rectangular rods, and although it may happen that the first propagation phase adjustment value of a certain first microcell is different from the propagation phase adjustment value of its corresponding first target micro-rectangular rod, since the first propagation phase adjustment value is very close to the propagation phase adjustment value, the slight difference does not affect the implementation of the function of the dual-function lens.
In one implementation manner, each of the plurality of second micro units has a corresponding second propagation phase adjustment value and a corresponding geometric phase adjustment value, so as to implement off-axis focusing of the emergent light from the end face.
Specifically, in order to realize off-axis focusing of the outgoing light from the end face, the superlens mirror body in this embodiment needs to adjust the propagation phase and the geometric phase of the outgoing light from the end face. Because the second micro units in the superlens body are used for realizing off-axis focusing, each second micro unit needs to have a corresponding second propagation phase adjustment value and a corresponding geometric phase adjustment value, wherein the second propagation phase adjustment value can reflect the change situation of the propagation phase of the emergent light of the end face after passing through each second micro unit, and the geometric phase adjustment value can reflect the change situation of the geometric phase of the emergent light of the end face after passing through each second micro unit. The present embodiment implements modulation of the propagation phase and the geometric phase of the light by each second microcell, thereby obtaining an off-axis focus. As shown in the figure, the off-axis focuses are two symmetric off-axis focuses, and one off-axis focus is positioned on the left side of the central axis of the super lens body, namely the left off-axis focus; the other is located to the right of the central axis of the superlens body, i.e., the right off-axis focal point. Briefly, the modulation of the geometric phase refers to a phenomenon that the left-handed light is converted into the right-handed light after passing through the super lens body (with theta rotation along the Z axis), or the right-handed light is converted into the left-handed light after passing through the super lens body, and a geometric phase of + -2 theta is obtained. Any incident light can be regarded as a superposition of left-handed light and right-handed light, and the left off-axis focus and the right off-axis focus correspond to the left-handed light part and the right-handed light part of the incident light respectively.
In one implementation, since the position of each second micro-cell on the superlens body is different, it is necessary to calculate their second propagation phase adjustment value and geometric phase adjustment value separately for the coordinate data of each second micro-cell. The specific calculation method is shown in the following formulas (2), (3) and (4), wherein the sum of the second propagation phase adjustment value and the geometric phase adjustment value of each second microcell is determined by the formula (2), the second propagation phase adjustment value of each second microcell is determined by the formula (3), and the geometric phase adjustment value of each second microcell is determined by the formula (4):
wherein x and y are coordinate data of each second micro unit in the super lens body, wherein x0A distance between the left off-axis focus or the right off-axis focus and the center focus based on off-axis focusing, + corresponding to the left off-axis focus, -corresponding to the right off-axis focus. In short,the second microcell in this embodiment is rotated at an angle to convert the optical rotation and induce an additional geometric phase change to achieve the light modulation. The circularly polarized light obtains an additional phase ± 2 θ, i.e. a geometric phase, by a unit cell of rotation angle θ, wherein the +, -sign indicates handedness (+ left-handed, -right-handed) of circularly polarized incident light.
In the actual process of making the dual-function superlens, the present embodiment may use the aforementioned set of alternative micro-rectangular rods to determine the entity corresponding to each second micro-unit. Specifically, according to the formula (2) and the formula (3), second propagation phase adjustment values corresponding to second micro-cells at different positions on the microlens body can be calculated, and then second target micro-rectangular rods corresponding to the second micro-cells in the set of candidate micro-rectangular rods are determined. And aiming at any one second microcell, the second target micro-rectangular rod corresponding to the microcell is the microcell with the propagation phase adjustment value closest to the corresponding second propagation phase adjustment value in the group of candidate micro-rectangular rods. And then extracting a second target micro rectangular bar corresponding to each second micro unit, and placing the second target micro rectangular bar at a position corresponding to each second micro unit to obtain the dual-function super lens. Similarly, although it may happen that the second propagation phase adjustment value of a certain second microcell is different from the propagation phase adjustment value of the corresponding second target micro-rectangular rod, the slight difference does not affect the implementation of the dual-function lens function because the second propagation phase adjustment value is very close to the propagation phase adjustment value.
In one implementation, each of the second micro-units has a corresponding rotation angle to reach the geometric phase adjustment value corresponding to each of the second micro-units, where the rotation angle is one-half of the geometric phase adjustment value.
In particular, since the second micro-unit is used to implement the off-axis focusing function of the dual-function superlens, the second micro-unit needs to change not only the propagation phase of light but also the geometric phase of light. In order to realize the function of modulating the geometric phase of the second micro-unit, the second micro-unit in this embodiment has a certain rotation angle compared with the first micro-unit, and the rotation of the light can be changed by the rotation angle of the second micro-unit, thereby causing the change of the geometric phase of the light. Since the position of each second microcell on the superlens body is different, the rotation angle of each second microcell is also different. For any one second microcell, the rotation angle of the second microcell is half of the corresponding geometric phase adjustment value. For example, the geometric phase adjustment value of the second microcell a is 1/4 π, and the rotation angle of the second microcell a is 1/8 π.
In one implementation, to improve the operating efficiency of the dual-function superlens, the first plurality of microcells and the second plurality of microcells are required to have as high a transmittance and a conversion efficiency as possible, wherein the transmittance may affect the efficiency of the center focus and the conversion efficiency may affect the efficiency of the off-axis focus. In one implementation, the transmittance of the first micro-cells and the second micro-cells needs to be greater than 90%, and the conversion efficiency needs to be greater than 90%.
Based on the above embodiments, the present invention further provides a method for detecting optical rotation, which is applied to the dual-function superlens described in claim 1, as shown in fig. 8, and the method includes:
step S100, emitting light to be detected into the dual-function super lens to obtain two off-axis focuses generated by the dual-function super lens based on the light to be detected;
s200, acquiring relative light intensity data of the two off-axis focuses;
and S300, determining the rotation data of the emergent light generated by the dual-function super lens based on the light to be detected according to the relative light intensity data.
Specifically, light to be detected firstly enters from the end face of the dual-function super lens, then emergent light of the end face enters the super lens body, the emergent light of the end face is subjected to propagation phase modulation and geometric phase modulation through the super lens body, so that levorotatory light in the emergent light of the end face is converted into dextrorotatory light, the dextrorotatory light is converted into levorotatory light, and then the emergent light of the super lens body and two off-axis focuses, namely a left off-axis focus and a right off-axis focus, generated based on the emergent light of the super lens body are obtained. The left off-axis focus corresponds to left rotation in emergent light of the end face, and the right off-axis focus corresponds to right rotation in emergent light of the end face. Since the relative light intensity data of the two off-axis focuses, namely the left off-axis focus and the right off-axis focus, can indirectly reflect the rotation of the emergent light of the super lens body, the rotation of the emergent light of the super lens body can be calculated based on the relative light intensity data of the two off-axis focuses (as shown in fig. 7). Wherein the relative light intensity data may be obtained by: firstly, a first light intensity value corresponding to a left off-axis focus and a second light intensity value corresponding to a right off-axis focus are obtained, and then the ratio of the first light intensity value to the second light intensity value is used as the relative light intensity data. For example, the light intensities of the left and right off-axis focuses are R1 and R2, respectively, and the relative light intensity data is the ratio of left and right rotation in the incident light, R1: r2, definition of optical helicity: (√ R1- √ R2)/√ R1+ √ R2).
In summary, the present invention discloses a dual-function superlens and a method for detecting optical rotation, wherein the dual-function superlens includes: the lens comprises a super lens body and an end face connected with the super lens body; the superlens comprises a first dielectric substance microstructure and a second dielectric substance microstructure, wherein the first dielectric substance microstructure is used for carrying out center focusing on emergent light of the end face, and the second dielectric substance microstructure is used for carrying out off-axis focusing on the emergent light of the end face. The dual-function super lens can simultaneously realize two functions of central focusing and off-axis focusing, so that the problem that most super lenses for adjusting the propagation phase adjusting value by utilizing a dielectric microstructure only have the function of central focusing and have single function in the prior art can be solved.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (10)
1. A dual function superlens, comprising: the lens comprises an end face and a super lens body connected with the end face;
the super lens body comprises a first dielectric substance microstructure and a second dielectric substance microstructure, wherein the first dielectric substance microstructure is used for carrying out center focusing on emergent light of the end face, and the second dielectric substance microstructure is used for carrying out off-axis focusing on the emergent light of the end face.
2. The bifunctional superlens of claim 1, wherein the end face is comprised of a photonic crystal fiber.
3. The bifunctional super lens according to claim 2, wherein the core mold of the photonic crystal fiber has a characteristic of maintaining a single mode in a wavelength band of 800nm to 1550nm, and the core diameter of the photonic crystal fiber is larger than that of a pure single mode fiber core.
4. The bi-functional superlens of claim 1, wherein the first dielectric microstructure comprises a plurality of first micro-cells and the second dielectric microstructure comprises a plurality of second micro-cells, the plurality of first micro-cells and the plurality of second micro-cells being arranged in regularly repeating groups, wherein each of the groups comprises the same number and ratio of the first micro-cells to the second micro-cells.
5. The dual function superlens of claim 4, wherein each of the first plurality of micro-cells has a corresponding first propagation phase adjustment value for providing center focusing of the emerging light from the endface.
6. The bifunctional superlens of claim 5, wherein the first propagation phase adjustment value satisfies formula (1):
and x and y are coordinate data of each first micro unit in the super lens body, f is the focal length of the super lens body, and lambda is the working wavelength of the super lens body.
7. The dual function superlens of claim 4, wherein each of the second plurality of micro-cells has a corresponding second propagation phase adjustment value and geometric phase adjustment value for off-axis focusing of the exit light from the endface.
8. The dual function superlens of claim 7, wherein a sum of the second propagation phase adjustment value and the geometric phase adjustment value satisfies formula (2), the second propagation phase adjustment value satisfies formula (3), and the geometric phase adjustment value satisfies formula (4):
wherein x, y are coordinate data of each of the second micro-units in the superlens body, wherein x0 is a distance between a left off-axis focus point or a right off-axis focus point and a central focus point based on off-axis focusing, + corresponding left off-axis focus point, -corresponding right off-axis focus point.
9. The dual function superlens of claim 7, wherein each of the second micro-cells has a corresponding rotation angle to achieve the geometric phase adjustment value for each of the second micro-cells, wherein the rotation angle is one-half of the geometric phase adjustment value.
10. A method for detecting optical helicity, the method being applied to the bifunctional superlens of claim 1, the method comprising:
injecting light to be detected into the dual-function super lens to obtain two off-axis focuses generated by the dual-function super lens based on the light to be detected;
acquiring relative light intensity data of the two off-axis focuses;
and determining the rotation data of the emergent light generated by the dual-function superlens based on the light to be detected according to the relative light intensity data.
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