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

Abstract

An optical angle selection and calculation device based on near-zero refractive index materials includes a stage, a laser light source, a temperature regulator, a magnetic field generator, a layered stacking structure, an angle-controlled rotating stage, a spectrum analyzer, an optical fiber coupler, and a micromotor. The main design part, namely the layered stacking structure, is composed of near-zero refractive index materials, including a main structure and an anti-reflection coating. The main structure is an InSb1 medium, and the anti-reflection coating includes InSb2 medium and silicon dioxide arranged in sequence. The near-zero characteristics of the InSb medium are used to construct an angle transmission window, which can achieve stable processing of polarization state light signals and precise temperature control. The present invention deeply integrates angle selection and calculation functions, and can realize complex light signal processing according to the change of the angle window of the light signal. It has the advantages of broadband, high angle selectivity, and tunability, and has a simple structure and low cost, which is conducive to large-scale production.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical devices, and in particular relates to an optical angle selection and calculation device based on near-zero refractive index materials. 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 ever-increasing demand for data transmission is driving the search for 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, there is a desire for more sensitive, multi-parameter sensing technologies. In the field of optical computing, to break through the bottlenecks of traditional electronic computing, there is an urgent need to develop new computing architectures that utilize the unique advantages of light.

[0003] Angle selection plays a vital role in the field of optical computing and is the key to achieving precise diversion of optical signals. Based on the differences in the incident angle of light, optical signals of different information are ensured to follow their own paths, effectively avoiding data confusion and interference, and laying the foundation for subsequent precise calculations. From the perspective of optical system construction, precise 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] A search revealed that Chinese patent publication number CN118367360A, published on July 19, 2024, discloses an angle-selective wave transmission structure and device based on a metal planar waveguide. This device utilizes the cutoff characteristics of the parallel planar waveguide transmission mode to achieve transmission performance at fixed angles and cutoff at other angles. This patent improves the previous problem of mostly spot-frequency operation, offering the advantages of broadband, low profile, and high angle selectivity.

[0005] As can be seen from this, current optical angle-selective computing devices primarily rely on fixed interference and diffraction principles, such as by constructing metal waveguides. This relatively simple approach suffers from drawbacks such as high optical loss and the generation of stray light, limiting their application in precision detection and complex optical computing. Furthermore, they lack flexible tuning capabilities. Once manufactured, their angle-selective characteristics are essentially fixed, making them difficult to adapt to changing operating conditions and diverse task requirements. Summary of the Invention

[0006] To address 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 changes 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 a cascade of the measurement range, thereby expanding the measurement range.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] An optical angle selection and calculation device based on near-zero refractive index materials includes a loading platform and a laser light source, a constant temperature box, a temperature regulator, a magnetic field generator, an angle control rotating stage and a spectrum analyzer arranged horizontally on the loading platform. The loading platform has a loading platform switch, and an optical fiber coupler and a micro motor arranged inside the loading platform; the laser light source, constant temperature box, temperature regulator, magnetic field generator, angle control rotating stage, spectrum analyzer and optical fiber coupler are respectively connected to the micro motor; the spectrum analyzer is connected to the optical fiber coupler; the angle control rotating stage and the optical fiber coupler are respectively connected to a layered stacked structure, which is placed horizontally on the angle control rotating stage; the optical fiber coupler is also connected to the layered stacked structure and the spectrum analyzer, the magnetic field generator is connected to the magnetic field regulator via a cable, and the temperature regulator is connected to the constant temperature box; the layered stacked structure includes a main structure and an anti-reflection layer coated on both sides; the medium arrangement order of the layered stacked 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.

[0009] As a further improvement of the present invention, the refractive index of the medium SiO2 is n SiO2 =1.45, thickness is d SiO2 =5 μm.

[0010] As a further improvement of the present invention, 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 =500 μm,d InSb2 =40 μm,

[0011] 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.

[0012] 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, it can achieve precise filtering based on the angle change of the light signal; when the calculation device is used as a sensor, it can realize background refractive index perception in the transverse magnetic (TM) mode through temperature adjustment.

[0013] Compared with the prior art, the present invention has the following technical effects:

[0014] (1) The present invention provides a novel optical angle selection calculation device, the working process of which 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 a test object as a 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 rotate the layered stack structure 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 an optical fiber coupler and input into a spectrum analyzer, which completes the analysis and judgment of the optical signal. The present invention utilizes 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.

[0015] (2) The present invention uses a near-zero refractive index material to form a layered stack structure, which can achieve precise filtering based on the angle change of the light signal.

[0016] (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.

[0017] (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

[0018] Figure 1A schematic diagram of the overall system structure of an optical angle selection calculation device according to an embodiment of the present invention;

[0019] 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;

[0020] Figure 3 A top view of a computing device selected for angle selection according to an embodiment of the present invention;

[0021] Figure 4 A front view of a computing device selected for angle selection according to an embodiment of the present invention;

[0022] Figure 5 A schematic diagram comparing an angle selection computing device according to an embodiment of the present invention with and without an anti-reflection layer in a TM mode;

[0023] Figure 6 is a schematic diagram of movement of the angular edge position when the refractive index of the background medium varies in the range of 1.0-1.2 according to an embodiment of the present invention;

[0024] Figure 7 is a schematic diagram showing the degree of fit between the refractive index and the angle change when the refractive index of the background medium varies in the range of 1.0-1.2 according to an embodiment of the present invention;

[0025] 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 rotation stage; 9-micro motor; 10-fiber coupler; 11-spectrum analyzer; 12-carrying platform switch; 13-electric cable. DETAILED DESCRIPTION

[0026] 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 based on this embodiment by other researchers in this field fall within the scope of protection of this patent.

[0027] The present invention discloses an optical angle selection and calculation device based on near-zero refractive index materials, comprising a layered stack structure 1, a loading platform 2, a laser light source 3, a constant temperature chamber 4, a temperature regulator 5, a magnetic field generator 6, a magnetic field regulator 7, an angle-controlled rotary stage 8, a micromotor 9, a fiber coupler 10, a spectrum analyzer 11, a loading platform switch 12, and an electrical cable 13. The present invention utilizes near-zero refractive index materials to construct the layered stack structure, enabling precise filtering based on the angular variation of optical signals, unaffected by polarization state. By regulating temperature and magnetic field intensity, refractive index measurements can be achieved in the TM wave mode, offering the advantage of a wide measurement range.

[0028] The overall system structure diagram of the computing device selected from this perspective is as follows Figure 1 As shown, the laser light source 3, spectrum analyzer 11, constant temperature box 4, magnetic field generator 6, and angle control rotary stage 8 are all placed horizontally on the loading platform 2, the layered stacked structure 1 is placed horizontally on the angle control rotary stage 8, and the micro motor 9 and fiber coupler 10 are placed inside the loading platform 2. The laser light source 3, fiber coupler 10, spectrum analyzer 11, magnetic field generator 6, constant temperature box 4, and angle control rotary stage 8 are all connected to the micro motor 9. The angle control rotary stage 8 is also connected to the layered stacked structure 1. The fiber coupler 10 is also connected to the layered stacked 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.

[0029] When the entire system is in operation, the anti-reflection layered stacked structure 1 is first placed on the angle-controlled rotating stage 8 and placed in a constant temperature chamber 4. The object to be tested is then placed in the constant temperature chamber 4 as the background medium. Then, the switch 12, spectrum analyzer 11, and micromotor 9 on the loading platform 2 are respectively turned on. The temperature regulator 5 is adjusted to a suitable temperature environment, and the magnetic field regulator 7 generates an appropriate magnetic field strength. The laser light source 3 emits an optical signal. The layered stacked structure 1 is acted upon by the angle-controlled rotating stage 8, which rotates the layered stacked structure 1 to a corresponding angle. This allows for accurate differentiation of optical signals at specific angles and obtains information on the angle change corresponding to the refractive index of the background medium. The angle change information is converted into a signal by the optical fiber coupler 10 and input into the spectrum analyzer 11, which then analyzes and determines the optical signal.

[0030] Layered stacking structure 1, such as Figure 2 As shown, the overall dielectric arrangement order is (SiO2InSb2) 3 (InSb1)(InSb2SiO2) 3 , consisting of a main structure in the middle and anti-reflective coatings at both ends, N 1 =3 and N 2 =3 represents the number of periods. The main structure is the medium InSb1, and the medium arrangement of the anti-reflection coating on both sides is (SiO2InSb2) 3 and (InSb2SiO2) 3 The media InSb1 and InSb2 are both InSb media, which is a near-zero refractive index material; the thickness of InSb1 and InSb2 are respectively d InSb1 =500 μm, d InSb2 =40 μm. The refractive index of the medium SiO2 nSiO2 =1.45, thickness is d SiO2 =5 μm.

[0031] When the computing device is used as an angle filter, it can achieve precise filtering based on the angle change of the light signal; when the computing device is used as a sensor, it can realize the background refractive index perception in the TM mode through temperature and magnetic field adjustment, and perform calculations based on the angle position as the address.

[0032] 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 from this angle.

[0033] like Figure 5 , electromagnetic waves have almost identical energy-hopping characteristics in the TM mode. Due to the inherent resonance characteristics of the monolayer InSb medium, transmission instabilities occur at the edge of the angle. To overcome this shortcoming, antireflection layers are applied on both sides of the main structure to achieve phase cancellation, thereby reducing reflections.

[0034] like Figure 6 As shown, as the refractive index of the background medium increases, the angle edge continuously shifts toward smaller angles. During the measurement process, the refractive index of the background medium in the constant temperature chamber 4 is increased while the angle control rotary stage 8 is rotated. When the reflectivity begins to flatten out suddenly, the angle and the background medium refractive index at that point are recorded to establish a linear relationship between the two.

[0035] like Figure 7 As shown, when the temperature is 280 K, the position with a reflectivity of 0.95 is selected as the observation point. When the background medium refractive index is between 1.0 and 1.2, the sensitivity is -86.4° / RIU, and the linear fit is 0.994, showing a good linear effect. As the background medium refractive index 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, restoring the angle edge to the angle when the background medium is air. This can expand the detection range.

[0036] Through specialized design (introduction of near-zero refractive index materials, application of antireflection coatings, and temperature and magnetic field control), the present invention enables precise polarization-independent angular filtering of optical signals and controllable temperature and refractive index detection over a wide range. This invention offers the advantages of novel design and tunability, along with a simple structure, low cost, and widespread application.

[0037] The above description is merely a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any modification or equivalent variation based on the technical essence of the present invention shall still fall within the scope of protection claimed 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), wherein 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 stack structure (1); the angle control rotating platform (8) and the optical fiber coupler (10) are respectively connected to the layered stack structure (1), and the layered stack structure (1) is horizontally placed on the angle control rotating platform (8); the optical fiber coupler (10) is also connected to the layered stack structure (1) and the spectrum analyzer (11); the magnetic field generator (6) is connected to the magnetic field regulator (7) through the cable (13); the temperature regulator (5) is connected to the constant temperature box (4); the layered stack structure (1) includes a main structure and an anti-reflection layer coated on both sides; the medium arrangement order of the layered stack 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 An anti-reflection coating having a layered stacked structure, wherein the main structure is an InSb1 medium having a near-zero refractive index property, and the anti-reflection coating comprises InSb2 medium and silicon dioxide arranged in sequence; The refractive index of the medium SiO2 n SiO2 =1.45, thickness is d SiO2 =5 μm; 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.

2. The optical angle selection and calculation device based on near-zero refractive index material according to claim 1, 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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