Optical angle selection and calculation device based on near-zero refractive index material

Abstract

The invention discloses an optical angle selection and calculation device based on a near-zero refractive index material. The optical angle selection and calculation device comprises an objective table, a laser light source, a temperature regulator, a magnetic field generator, a layered stacking structure, an angle control rotating table, a spectrum analyzer, an optical fiber coupler and a micro motor, the main design part, namely a layered stacked structure, is made of a near-zero refractive index material and comprises a main body structure and an anti-reflection coating, the main body structure is an InSb1 medium, and the anti-reflection coating comprises an InSb2 medium and silicon dioxide which are sequentially arranged. The near-zero characteristic of the InSb medium is adopted to construct an angle transmission window, so that stable processing of polarization-state optical signals can be realized, and the polarization-state optical signals can be accurately regulated and controlled by temperature. According to the invention, angle selection and calculation functions are deeply fused, complex optical signal processing can be realized according to angle window changes of optical signals, and the device has the advantages of wide band, high angle selectivity and tunability, and is simple in structure, low in cost and beneficial to large-scale production.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical devices, and in particular to an optical angle selection and calculation device based on a near-zero refractive index material. Background Art

[0002] With the rapid development of modern science and technology, the performance requirements for optical devices are becoming increasingly stringent. In the field of optical communications, the growing demand for data transmission has prompted people to seek more efficient optical signal processing methods to achieve high-speed, large-capacity data transmission and exchange; in optical sensing, whether it is precision measurement in industrial production or biomarker detection in the biomedical field, more sensitive and multi-parameter sensing technology is desired; in the field of optical computing, in order to break through the bottleneck of traditional electronic computing, it is urgent to use the unique advantages of light to develop a new computing architecture.

[0003] Angle selection plays a vital role in the field of optical computing and is the key to achieving accurate diversion of optical signals. Based on the difference in the incident angle of light, it ensures that optical signals of different information follow their own paths, effectively avoiding data confusion and interference, and laying the foundation for subsequent accurate calculations. From the perspective of optical system construction, accurate angle selection can optimize the layout of optical components and optical path design. By cleverly guiding the propagation direction of light, reducing unnecessary light reflection and refraction losses, improving light utilization, and reducing system energy consumption, optical computing can ensure stable and reliable computing performance while being energy-saving and environmentally friendly, and promote the expansion of optical computing into broader fields.

[0004] After searching, it was found that the Chinese patent with publication number CN118367360A disclosed an angle-selective wave transmission structure and device based on a metal flat waveguide on July 19, 2024. It uses the cutoff characteristics of the parallel flat waveguide transmission mode to achieve fixed angle wave transmission and other angle cutoff transmission performance. This patent improves the problem that the previous working frequency is mostly point frequency, and has the advantages of broadband, low profile and high angle selection steep drop.

[0005] It can be seen that the current optical angle selection calculation devices mainly rely on fixed interference and diffraction principles by constructing metal waveguides, which is a relatively simple method and has the disadvantages of large optical loss and easy generation of stray light, which limits its application in precision detection and complex optical calculation. In addition, it lacks flexible tuning capabilities. Once manufactured, its angle selection characteristics are basically fixed and it is difficult to adapt to changing working conditions and diverse task requirements. Summary of the invention

[0006] In response to the above problems, the present invention proposes an optical angle selection and calculation device based on near-zero refractive index materials. The device is designed based on the principle of angle modulation and uses an anti-reflection coating to suppress reflectivity. By using near-zero refractive index materials, precise filtering can be achieved based on the angle change of the optical signal without being affected by the polarization state. At the same time, temperature control and magnetic field control are used to achieve cascading of the measurement range, thereby expanding the measurement range.

[0007] To achieve the above object, the technical solution adopted by the present invention is: The optical angle selection and calculation device based on near-zero refractive index material comprises a loading platform and a laser light source, a thermostat, a temperature regulator, a magnetic field generator, an angle control rotating platform and a spectrum analyzer arranged horizontally on the loading platform, wherein the loading platform has a loading platform switch, and an optical fiber coupler and a micro motor arranged in the loading platform; the laser light source, the thermostat, the temperature regulator, the magnetic field generator, the angle control rotating platform, the spectrum analyzer and the optical fiber coupler are respectively connected to the micro motor; the spectrum analyzer is connected to the optical fiber coupler; the angle control rotating platform and the optical fiber coupler are respectively connected to a layered stacking structure, and the layered stacking structure is horizontally placed on the angle control rotating platform; the optical fiber coupler is also connected to the layered stacking structure and the spectrum analyzer, the magnetic field generator is connected to the magnetic field regulator through a cable, and the temperature regulator is connected to the thermostat; the layered stacking structure comprises a main structure and an anti-reflection layer coated on both sides; the arrangement order of the medium of the layered stacking structure is (SiO 2 i 2 ) 3 (InSb 1 )(InSb 2 SiO 2 ) 3 , medium InSb 1 The main structure is a layered stacking structure; the dielectric arrangement groups (SiO 2 i 2 ) 3 and (InSb 2 SiO 2 ) 3 The anti-reflection coating is a layered stacked structure, wherein the main structure is InSb with a near-zero refractive index property. 1 medium, the anti-reflection coating comprises sequentially arranged InSb 2 medium and silica.

[0008] As a further improvement of the present invention, the medium SiO 2 Refractive index n SiO2 =1.45, thickness is d SiO2 =5 μm.

[0009] As a further improvement of the present invention, the medium InSb 1 and InSb 2 are all InSb media, and the dielectric constant changes from negative to positive at a point in the frequency domain; the medium InSb 1 and InSb 2 The thicknesses are d InSb1 =500 μm, d InSb2 =40 μm, As a further improvement of the present invention, when the dielectric constant of the medium InSb is greater than 0, the energy of the electromagnetic wave can be propagated in a layered stack to form a transmittance region; when the dielectric constant of the medium InSb is equal to or less than 0, the electromagnetic wave is almost completely reflected, and the jumping characteristics in the frequency domain can be transferred to the angular domain to achieve angle selection.

[0010] As a further improvement of the present invention, the optical angle selection and calculation device utilizes the near-zero characteristics of indium antimonide to realize an adjustable angle transmission window; when the calculation device is used as an angle filter, precise filtering can be achieved based on the angle change of the light signal; when the calculation device is used as a sensor, the background refractive index perception in the transverse magnetic (TM) mode can be achieved through temperature adjustment.

[0011] Compared with the prior art, the present invention has the following technical effects: (1) The present invention provides a novel optical angle selection calculation device, and its working process is as follows: first, a layered stack structure coated with an anti-reflection layer is placed on an angle control rotating table and placed in a constant temperature box, filled with the object to be tested as the background medium, the temperature regulator is started to a suitable temperature environment, the magnetic field generator generates a suitable magnetic field strength, the micro motor is started, and the laser light source emits a laser signal. Through the action of the layered stack structure, the angle control rotating table is rotated to make the layered stack structure rotate at a corresponding angle, thereby accurately distinguishing the optical signal at a specific angle and obtaining the angle change information corresponding to the refractive index of the background medium. The angle change information is converted into a signal through a fiber coupler and input into a spectrum analyzer, which completes the analysis and judgment of the optical signal; the present invention uses a unique angle selection characteristic to screen the optical signal at a specific angle and detect the refractive index of the background medium, and has significant advantages such as small physical size, good safety, and a wide range of applications.

[0012] (2) The present invention uses a near-zero refractive index material to form a layered stacking structure, which can achieve precise filtering according to the angle change of the optical signal.

[0013] (3) The present invention adopts a layered stacking structure with anti-reflection layers coated on both ends of the main structure to obtain a stable angle selection function and achieve high-sensitivity perception.

[0014] (4) The present invention realizes the measurement of refractive index in TM wave mode by regulating the temperature, which has the advantage of a wide measurement range. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the overall system structure of an optical angle selection calculation device according to an embodiment of the present invention; Figure 2 A schematic diagram of a unit structure of a layered stacked structure of an angle selection computing device according to an embodiment of the present invention; Figure 3 A top view of a computing device for angle selection according to an embodiment of the present invention; Figure 4 A front view of a computing device for angle selection according to an embodiment of the present invention; Figure 5 A schematic diagram comparing an angle selection computing device according to an embodiment of the present invention with an anti-reflection layer introduced in a TM mode and without an anti-reflection layer introduced; Figure 6 is a schematic diagram of the movement of the angle edge position when the refractive index of the background medium according to an embodiment of the present invention changes in the range of 1.0-1.2; Figure 7 is a schematic diagram of the fitting degree between the refractive index and the angle change when the refractive index of the background medium changes in the range of 1.0-1.2 according to an embodiment of the present invention; In the figure: 1-layered stacking structure; 2-carrying platform; 3-laser light source; 4-constant temperature box; 5-temperature regulator; 6-magnetic field generator; 7-magnetic field regulator; 8-angle control rotating table; 9-micro motor; 10-optical fiber coupler; 11-spectrum analyzer; 12-carrying platform switch; 13-electric cable. DETAILED DESCRIPTION

[0016] The following is a detailed description of the technical solution of the application in conjunction with the accompanying drawings. The described embodiments are only part of the embodiments involved in this patent. All non-innovative embodiments of other researchers in this field based on this embodiment are within the scope of protection of this patent.

[0017] The present invention discloses an optical angle selection and calculation device based on a near-zero refractive index material, comprising a layered stacking structure 1, a loading platform 2, a laser light source 3, a constant temperature box 4, a temperature regulator 5, a magnetic field generator 6, a magnetic field regulator 7, an angle control rotating platform 8, a micro motor 9, an optical fiber coupler 10, a spectrum analyzer 11, a loading platform switch 12 and a cable 13. In the present invention, a layered stacking structure is formed by using a near-zero refractive index material, and accurate filtering can be achieved according to the angle change of the optical signal without being affected by the polarization state; by adjusting the temperature and the magnetic field intensity, the refractive index measurement in the TM wave mode is achieved, and the measurement range is wide.

[0018] The overall system structure diagram of the computing device selected from this angle is as follows Figure 1 As shown, the laser light source 3, the spectrum analyzer 11, the constant temperature box 4, the magnetic field generator 6 and the angle control rotating table 8 are all placed horizontally on the loading platform 2, the layered stacking structure 1 is placed horizontally on the angle control rotating table 8, and the micro motor 9 and the optical fiber coupler 10 are placed in the loading platform 2. The laser light source 3, the optical fiber coupler 10, the spectrum analyzer 11, the magnetic field generator 6, the constant temperature box 4, and the angle control rotating table 8 are all connected to the micro motor 9, the angle control rotating table 8 is also connected to the layered stacking structure 1, the optical fiber coupler 10 is also connected to the layered stacking structure 1 and the spectrum analyzer 11, the magnetic field generator 6 is connected to the magnetic field regulator 7 through the cable 13, and the temperature regulator 5 is connected to the constant temperature box 4.

[0019] When the whole system is working, the layered stacking structure 1 coated with the anti-reflection layer is first placed on the angle-controlled rotating table 8 and placed in the constant temperature box 4, and the object to be tested is filled into the constant temperature box 4 as the background medium. Then the switch 12, the spectrum analyzer 11 and the micro motor 9 on the loading platform 2 are respectively adjusted to a suitable temperature environment, the magnetic field regulator 7 generates a suitable magnetic field intensity, and the laser light source 3 emits a light signal. Through the layered stacking structure 1, the rotating angle control rotating table 8 causes the layered stacking structure 1 to rotate at a corresponding angle, thereby accurately distinguishing the optical signal at a specific angle and obtaining the angle change information corresponding to the refractive index of the background medium. The angle change information is converted into a signal through the optical fiber coupler 10 and input into the spectrum analyzer 11, and the spectrum analyzer 11 completes the analysis and judgment of the optical signal.

[0020] Layered stacking structure 1, such as Figure 2 As shown, the overall dielectric arrangement order is (SiO 2 i 2 ) 3 (InSb 1 )(InSb 2 SiO 2 ) 3 , consisting of a main structure in the middle and anti-reflection coatings at both ends.N 1 =3 and N 2 =3 indicates the number of cycles. The main structure is the medium InSb 1 The dielectric arrangement of the anti-reflection coating on both sides is (SiO 2 i 2 ) 3 and (InSb 2 SiO 2 ) 3 . Medium InSb 1 and InSb 2 Both are InSb media, a near-zero refractive index material; InSb 1 and InSb 2 The thicknesses are d InSb1 =500 μm, d InSb2 =40 μm. Dielectric SiO 2 Refractive index n SiO2 =1.45, thickness is d SiO2 =5 μm.

[0021] When the computing device is used as an angle filter, precise filtering can be achieved according to the angle change of the optical signal; when the computing device is used as a sensor, the temperature and magnetic field can be adjusted to achieve background refractive index perception in the TM mode, and calculations can be performed using the angle position as the address.

[0022] Figure 3 and Figure 4 They are respectively the top view and the front view of the overall system structure of the computing device selected at this angle.

[0023] like Figure 5 , the electromagnetic wave has almost the same energy jump characteristics in the TM mode. Due to the inherent resonance characteristics of the single-layer InSb medium, transmission instability occurs at the angle edge. In order to overcome this shortcoming, anti-reflection layers are coated on both sides of the main structure to meet the phase cancellation conditions, thereby reducing reflection.

[0024] like Figure 6 As shown in FIG. 1 , when the refractive index of the background medium increases, the position of the angle edge continuously moves toward the direction of the smaller angle. During the measurement process, the refractive index of the background medium in the constant temperature box 4 is increased while the angle control rotating table 8 is rotated. When the reflectivity begins to become flat suddenly, the angle and the refractive index of the background medium at this time are recorded, and a linear relationship between the two can be established.

[0025] like Figure 7As shown, when the temperature is 280 K, the position with a reflectivity of 0.95 is selected as the observation point. When the refractive index of the background medium is 1.0-1.2, the sensitivity is -86.4° / RIU, and the linear fit is 0.994, which has a good linear effect. As the refractive index value of the background medium continues to increase, the linear fit decreases. At this time, adjusting the temperature regulator 5 can reduce the temperature in the constant temperature box 4, so that the angle edge returns to the angle when the background medium is air. In this way, the detection range can be expanded.

[0026] After specific design (introducing near-zero refractive index materials, coating anti-reflection coatings, and temperature and magnetic field regulation), the present invention can achieve precise optical signal angle filtering that is not affected by polarization state and adjustable temperature and refractive index over a wide range of detection. The present invention has the advantages of novel design and tunability, simple structure, low cost, and can be widely used.

[0027] The above description is only a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any modification or equivalent change made based on the technical essence of the present invention still falls within the scope of protection required by the present invention.

Claims

1. An optical angle selection and calculation device based on near-zero refractive index materials, characterized in that: The invention comprises a loading platform (2) and a laser light source (3) horizontally arranged on the loading platform (2), a constant temperature box (4), a temperature regulator (5), a magnetic field generator (6), an angle control rotating platform (8) and a spectrum analyzer (11); the loading platform (2) has a loading platform switch (12), an optical fiber coupler (10) and a micro motor (9) arranged in the loading platform (2); the laser light source (3), the constant temperature box (4), the temperature regulator (5), the magnetic field generator (6), the angle control rotating platform (8), the spectrum analyzer (11) and the optical fiber coupler (10) are respectively connected to the micro motor (9); the spectrum analyzer (11) The optical fiber coupler (10) is connected to the layered stacking structure (1); the angle control rotating platform (8) and the optical fiber coupler (10) are respectively connected to the layered stacking structure (1), and the layered stacking structure (1) is horizontally placed on the angle control rotating platform (8); the optical fiber coupler (10) is also connected to the layered stacking structure (1) and the spectrum analyzer (11); the magnetic field generator (6) is connected to the magnetic field regulator (7) via a cable (13); and the temperature regulator (5) is connected to the constant temperature box (4); the layered stacking structure (1) comprises a main structure and an anti-reflection layer coated on both sides; the medium arrangement order of the layered stacking structure is (SiO2InSb2) 3 (InSb1)(InSb2SiO2) 3 The dielectric InSb1 is the main structure of the layered stacking structure; the dielectric arrangement groups (SiO2InSb2) on both sides 3 and (InSb2SiO2) 3 The anti-reflection coating is a layered stacked structure, wherein the main structure is an InSb1 medium with a near-zero refractive index property, and the anti-reflection coating comprises InSb2 medium and silicon dioxide arranged in sequence.

2. The optical angle selection and calculation device based on near-zero refractive index material according to claim 1, characterized in that: The refractive index of the medium SiO2 n SiO2 =1.45, thickness is d SiO2 =5 μm.

3. The optical angle selection and calculation device based on near-zero refractive index material according to claim 1, characterized in that: The dielectrics InSb1 and InSb2 are both InSb dielectrics, and the dielectric constant changes from negative to positive at a point in the frequency domain; the thicknesses of the dielectrics InSb1 and InSb2 are respectively d InSb1 =500μm, d InSb2 =40 μm.

4. The optical angle selection and calculation device based on near-zero refractive index material according to claim 3, characterized in that: When the dielectric constant of the medium InSb is greater than 0, the energy of the electromagnetic wave can be propagated in a layered stack to form a transmittance region; when the dielectric constant of the medium InSb is equal to or less than 0, the electromagnetic wave is almost completely reflected, and the jumping characteristics in the frequency domain can be transferred to the angular domain to achieve angle selection.

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