A terahertz flexible metamaterial spectral response detection device and its use method

Abstract

The present invention relates to a terahertz flexible metamaterial spectral response detection device and a method for using the same. The detection device is arranged between a terahertz emitter and a terahertz detector of a terahertz optical system. The detection device specifically comprises a one-dimensional displacement platform and a T-shaped stage installed on a base; the T-shaped stage and the T-shaped clamping plate jointly clamp and fix the edge of the metamaterial via a second locking bolt; the one-dimensional displacement platform and the base are connected via a third locking bolt, and the upper end of the one-dimensional displacement platform and the platform clamping plate are clamped and fixed to the other end edge of the metamaterial via a first locking bolt; a hollow portion is provided below the installation position of the metamaterial to allow the transmission of terahertz waves. Application of this technical solution can realize flexible detection of metal aperture terahertz metamaterials.

Description

Technical Field

[0001] The present invention relates to the technical field of terahertz flexible metamaterials, and in particular to a terahertz flexible metamaterial spectral response detection device and a method for using the same. Background Art

[0002] Metamaterials possess unique capabilities for controlling electromagnetic waves, inducing surface plasmon resonances within micro- and nanoscale structures. They have become core components of various terahertz (THz) devices. Metamaterial-based THz devices are widely used in antenna radar, waveguide transmission, high-resolution imaging, high-power THz sources, and high-sensitivity sensing, and have yielded some groundbreaking research results. In practice, materials often need to bend and deform to adapt to complex and changing detection environments. Consequently, research and development of flexible metamaterials is gaining increasing attention, striving to achieve their versatility and adaptability.

[0003] Due to their unique structure and properties, metal aperture metamaterials are very suitable for use as flexible metamaterials in various terahertz devices. By using femtosecond laser direct writing technology to ablate metal films, periodic arrays with artificially designed structures can be directly prepared. This independent structure effectively avoids the loss problem caused by substrate effects. In addition, metal aperture metamaterials also inherit the stable physical and chemical properties and high flexibility characteristics of metal films, making them suitable for use as independent structures in terahertz flexible devices. To this end, in the experiment, it is crucial to design a device that can not only accurately measure the spectral response of metal aperture metamaterials, but also detect the bending of metamaterials to any degree. This is crucial for the research and development of flexible terahertz devices. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide a terahertz flexible metamaterial spectral response detection device and a use method thereof, which can realize flexible detection of metal aperture terahertz metamaterials.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a terahertz flexible metamaterial spectral response detection device, which is arranged between the terahertz emitter and the terahertz detector of the terahertz optical system. The detection device specifically includes a one-dimensional displacement platform and a T-shaped stage installed on a base; the T-shaped stage and the T-shaped clamping plate jointly clamp and fix the edge of the metamaterial through a second locking bolt; the one-dimensional displacement platform and the base are connected through a third locking bolt, and the upper end of the one-dimensional displacement platform and the platform clamping plate are clamped and fixed to the other end of the metamaterial through a first locking bolt; there is a hollow part under the installation position of the metamaterial to allow the transmission of terahertz waves.

[0006] In a preferred embodiment, the metamaterial structure uses a single layer of aluminum foil as a raw material, and utilizes femtosecond laser direct writing to ablate thin film metal to prepare a metal aperture array with a special structure.

[0007] In a preferred embodiment, the base is made by 3D printing technology, and there is a hollow part below the placement of the metamaterial, with a range of 25×18 mm 2 The rectangular through hole allows the terahertz wave to pass through the device; one end of the base is engraved with four M3 through holes for fixing the one-dimensional displacement platform; the other end has two square grooves for installing the T-stage.

[0008] In a preferred embodiment, the one-dimensional displacement platform has a stroke of 15 mm and a step distance of 10 μm, and is fixed to the base by four M3 third locking bolts.

[0009] In a preferred embodiment: the displacement platform is fixed with 4 first locking bolts with a size of 30×45 mm. 2 The platform splint clamps the metamaterial; the metamaterial is bent and tested by adjusting the position of the displacement platform.

[0010] In a preferred embodiment: the raised portion of the T-shaped platform has two 5×10×5 mm 3 The square block can be installed in the groove of the base for fixation, and there are four M3 screw holes engraved on the other end.

[0011] In a preferred embodiment: the T-shaped splint size is 30×45 mm 2 There are also M3 screw holes engraved around it. The sample can be clamped to the T-shaped stage through the second locking bolt to fix the sample without moving during the test.

[0012] In a preferred embodiment, the base, T-shaped platform, platform clamp and T-shaped clamp in the terahertz flexible metamaterial spectral response detection device are all made of PLA three-dimensional printing material.

[0013] The present invention also provides a method for using a terahertz flexible metamaterial spectral response detection device, which uses the above-mentioned terahertz flexible metamaterial spectral response detection device and includes the following steps:

[0014] 1) Unscrew the second locking bolt on the T-shaped clamp and place the edge of the metamaterial on the T-shaped platform; then tighten the second locking bolt to secure it.

[0015] 2) Adjust the displacement platform to its maximum range and away from the sample. Unscrew the first locking bolt on the platform clamp to separate the clamp from the displacement platform. Adjust the displacement platform closer to the other end of the metamaterial sample. After the edge of the material contacts the platform surface, cover the clamp with the edge of the sample and secure and clamp it with the first locking bolt. Ensure that the metamaterial does not bend during this process. After clamping, fine-tune the material to achieve the optimal flatness.

[0016] 3) Place the self-built detection device in the terahertz time-domain spectroscopy system, so that the terahertz wave is perpendicularly incident on the surface of the metamaterial array. Observe the test spectrum signal to determine whether the terahertz wave is blocked by the hollow part. If not, a sample signal can be obtained;

[0017] 4) By adjusting the knob, the displacement platform moves, and the metamaterial is bent to varying degrees according to actual requirements. At the same time, the sample signal is obtained through the terahertz time-domain spectroscopy system.

[0018] Compared with existing technologies, this invention offers the following advantages: It can monitor the spectral response of metallic aperture metamaterials in real time at different bending angles, ensuring the stability and reliability of material performance in various application scenarios. This has important practical significance and application value for the development of efficient and durable terahertz flexible devices. By continuously optimizing and improving this detection device, it will further promote the widespread application and development of flexible metamaterials in the field of terahertz technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the three-dimensional structure of an embodiment of the present invention;

[0020] Figure 2 1 is a schematic diagram of the main structure of an embodiment of the present invention;

[0021] Figure 3 1 is a schematic top view of the structure of an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the parts disassembly of an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the terahertz spectroscopy system test principle in an embodiment of the present invention;

[0024] Figure 6 This is a real picture of the metamaterial in an embodiment of the present invention when it is not bent;

[0025] Figure 7 This is a real picture of the metamaterial when it is bent in an embodiment of the present invention.

[0026] In the picture:

[0027] 1-first locking bolt; 2-platform clamp; 3-one-dimensional displacement platform; 4-base; 5-T-shaped clamp; 6-second locking bolt; 7-T-shaped platform; 8-knob; 9-nut; 10-hollow part; 11-third locking bolt. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0029] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application; as used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form, and it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0031] like Figures 1 to 7 The present invention discloses a device for detecting the spectral response of a terahertz flexible metamaterial and its use method. The device is installed between the terahertz emitter and terahertz detector of a terahertz optical system (not shown). Specifically, the device comprises a one-dimensional displacement platform 3 and a T-shaped platform 7 mounted on a base 4. The T-shaped platform 7 and the T-shaped clamping plate 5 are clamped and secured together at the edge of the metamaterial via a second locking bolt 6. The one-dimensional displacement platform 3 is connected to the base 4 via a third locking bolt 11, and the displacement platform 3 and the platform clamping plate 2 are clamped and secured together at the other end of the metamaterial via a first locking bolt 1. A hollow portion 10 is provided below the mounting area of ​​the metamaterial to allow for the transmission of terahertz waves. The device can be moved by adjusting a knob 8, thereby bending the metamaterial to varying degrees. Terahertz waves generate surface plasmon resonance in the bent metamaterial, which is then detected. The device has a simple structure and is easy to debug, offering potential experimental applications in the research of flexible terahertz devices.

[0032] In this embodiment, the metamaterial structure uses a single layer of aluminum foil as the raw material, and utilizes femtosecond laser direct writing to ablate the thin film metal to prepare a metal aperture array with a special structure.

[0033] In this embodiment, the base 4 is made by 3D printing technology, and there is a hollow part 10 below the placement of the metamaterial, with a range of 25×18 mm. 2The rectangular through hole allows the terahertz wave to pass through the device; one end of the base is engraved with four M3 through holes for fixing the one-dimensional displacement platform; the other end has two square grooves for installing the T-shaped stage 7.

[0034] In this embodiment, the one-dimensional displacement platform 3 has a stroke of 15 mm and a step distance of 10 μm, and is fixed to the base 4 by four M3 third locking bolts 11. The displacement platform 3 is fixed by four first locking bolts 1 with a size of 30×45 mm. 2 The platform clamp 2 clamps the metamaterial; the position of the displacement platform 3 is moved by adjusting the knob 8, so that the metamaterial is bent and tested.

[0035] In this embodiment, the raised portion of the T-shaped platform 7 has two 5×10×5 mm 3 The square block can be installed in the groove of the base 4 for fixation; the other end has four M3 screw holes, which can be clamped with the T-shaped clamp 5 to fix the other end of the metamaterial. The size of the T-shaped clamp 5 is 30×45 mm 2 There are also M3 screw holes around it. The second locking bolt 6 and the nut 9 are used to cooperate with the T-shaped stage 7 and the T-shaped clamping plate 5 to clamp the sample, fixing the sample so that it does not move during the test process.

[0036] In this embodiment, the base 4 , the T-shaped platform 7 , the platform clamping plate 2 , and the T-shaped clamping plate 5 in the terahertz flexible metamaterial spectral response detection device are all made of PLA three-dimensional printing material.

[0037] In this embodiment, the displacement platform 3 and the T-shaped stage 7 are both mounted on the base and are not disassembled, while the platform clamping plate 2 and the T-shaped clamping plate 5 are frequently disassembled according to the need to replace the sample.

[0038] In this embodiment, the terahertz flexible metamaterial spectral response detection device and its use method are carried out according to the following steps:

[0039] (1) Unscrew the second locking bolt 6 on the T-shaped clamp 5 and place the edge of the metamaterial in contact with the T-shaped platform 7; then tighten the second locking bolt 6 to fix and clamp it.

[0040] (2) Adjust the displacement platform 3 to the maximum range and away from the sample, unscrew the first locking bolt 1 on the platform clamp 2 to separate the platform clamp 2 from the displacement platform 3; adjust the displacement platform 3 close to the other end of the metamaterial sample, cover the edge of the sample with the platform clamp 2 after the edge of the material contacts the platform surface, and fix and clamp it with the first locking bolt 1; in this process, try to ensure that the metamaterial does not bend, and perform fine adjustments after clamping to ensure that the material is in the best flat state.

[0041] (3) The self-built detection device is placed in the terahertz time-domain spectroscopy system so that the terahertz wave is vertically incident on the surface of the metamaterial array. The test spectrum signal is observed to determine whether the terahertz wave is blocked by the hollow portion 10. If not, a sample signal can be obtained.

[0042] (4) The displacement platform is moved by adjusting knob 8, and the metamaterial is bent to different degrees according to actual requirements. At the same time, the sample signal is obtained through the terahertz time-domain spectroscopy system.

[0043] The advantages of the present invention are:

[0044] (1) The material is bent to different degrees by moving the translation stage, which has potential engineering application value in analyzing the detection performance of metamaterials after bending.

[0045] (2) A one-dimensional displacement platform is used to precisely control the bending degree of the metamaterial, thereby achieving quantitative analysis of the metamaterial's terahertz spectral response detection performance.

[0046] (3) It is not only suitable for the measurement of metal aperture metamaterials, but also can be used to test the performance of flexible metamaterial terahertz devices under different deformation conditions such as tension or compression.

[0047] (4) A rapid prototyping method using 3D printing was adopted, and PLA 3D printing materials were used to process the fixture, sample holder, base and other parts, which greatly reduced the processing cycle and cost as well as the overall weight of the detection device.

[0048] If the present invention discloses or involves components or structures that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by integral molding using a casting process) (except where it is obviously not possible to use an integrated molding process).

[0049] In addition, unless otherwise stated, the terms used in any technical solution disclosed in the present invention to express positional relationships or shapes include states or shapes that are approximate, similar, or close thereto.

[0050] Any component provided by the present invention may be assembled from multiple separate components, or may be a separate component manufactured by an integral molding process.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solutions of the present invention. They should all be included in the scope of the technical solutions claimed for protection by the present invention.

Claims

1. A terahertz flexible metamaterial spectral response detection device, characterized by: The detection device is arranged between the terahertz emitter and the terahertz detector of the terahertz optical system. The detection device specifically includes a one-dimensional displacement platform and a T-shaped stage installed on a base; the T-shaped stage and the T-shaped clamping plate jointly clamp and fix the edge of the metamaterial via a second locking bolt; the one-dimensional displacement platform is connected to the base via a third locking bolt, and the upper end of the one-dimensional displacement platform and the platform clamping plate are clamped and fixed to the other end of the metamaterial via a first locking bolt; a hollow portion is provided below the installation position of the metamaterial to allow the transmission of terahertz waves; The metamaterial is a metal aperture array with a special structure prepared by using a single layer of aluminum foil as a raw material and ablating the single layer of aluminum foil by femtosecond laser direct writing; The base is made by 3D printing technology, with a hollow part below the placement of the metamaterial, ranging from 25×18 mm 2 The rectangular through hole allows the terahertz wave to pass through the device; one end of the base is engraved with four M3 through holes for fixing the one-dimensional displacement platform; the other end has two square slots for installing the T-shaped stage; The one-dimensional translation stage has a travel of 15 mm and a step distance of 10 μm and is fixed to the base by four M3 third locking bolts; The size is 30×45 mm and is fixed on the displacement platform by 4 first locking bolts. 2 The platform splint clamps the metamaterial; the metamaterial is bent and tested by adjusting the position of the displacement platform; The raised portion of the T-shaped platform has two 5×10×5 mm 3 The square block can be installed in the groove of the base for fixation, and there are four M3 screw holes on the other end; T-shaped splint size 30×45 mm 2 There are also M3 screw holes engraved around it. The sample can be clamped to the T-shaped stage through the second locking bolt to fix the sample without moving during the test.

2. The terahertz flexible metamaterial spectral response detection device according to claim 1, characterized in that: The base, T-shaped platform, platform clamp and T-shaped clamp in the terahertz flexible metamaterial spectral response detection device are all made of PLA three-dimensional printing material.

3. A method for using a terahertz flexible metamaterial spectral response detection device, characterized by: A terahertz flexible metamaterial spectral response detection device according to any one of claims 1 to 2 is used; the device comprises the following steps: 1) Unscrew the second locking bolt on the T-shaped clamp and place the edge of the metamaterial on the T-shaped platform; then tighten the second locking bolt to secure it. 2) Adjust the displacement platform to its maximum range and away from the sample. Unscrew the first locking bolt on the platform clamp to separate the clamp from the displacement platform. Adjust the displacement platform closer to the other end of the metamaterial sample. After the edge of the material contacts the platform surface, cover the clamp with the edge of the sample and secure and clamp it with the first locking bolt. Ensure that the metamaterial does not bend during this process. After clamping, fine-tune the material to achieve the optimal flatness. 3) Place the self-built detection device in the terahertz time-domain spectroscopy system, so that the terahertz wave is perpendicularly incident on the surface of the metamaterial array. Observe the test spectrum signal to determine whether the terahertz wave is blocked by the hollow part. If not, a sample signal can be obtained; 4) By adjusting the knob, the displacement platform moves, and the metamaterial is bent to varying degrees according to actual requirements. At the same time, the sample signal is obtained through the terahertz time-domain spectroscopy system.

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