Bimetallic transparent infrared stealth metafilm

Abstract

The present invention discloses a bimetallic transparent infrared stealth meta-film, which belongs to the technical field of multi-spectrum compatible stealth materials. Its heterogeneous film system structure is D / M2 / S / M1 / Z, wherein the material of the Z film layer is selected from ZnTe or ZnSe; the materials of the M1 film layer and the M2 film layer are selected from Ag, Au, and Cu, and the materials of the M1 film layer and the M2 film layer are different; the material of the S film layer is selected from ATO or FTO; the material of the D film layer is selected from MgO or TiO2; the thickness of the Z film layer, the S film layer, and the D film layer are all 20 to 60 nm, and the thickness of the M1 film layer and the M2 film layer are all 5 to 15 nm. The bimetallic transparent infrared stealth meta-film of the present invention has achieved an infrared stealth effect that takes into account the dual functions of high transparency in the visible light band of 0.38 to 0.78 μm and low radiation in the mid-to-far infrared band of 3 to 15 μm, and can be used as or for preparing visible light and infrared compatible stealth materials.

Description

Technical Field

[0001] The invention relates to a bimetallic transparent infrared stealth meta-film, belonging to the technical field of multi-spectrum compatible stealth materials. Background Art

[0002] With the rapid development and widespread application of thermal infrared reconnaissance and optoelectronic detection technology, visible light and infrared compatible stealth material technology has become an important topic in the field of camouflage. Infrared detection technology has high resolution and good anti-interference ability. Its working band is mainly in the atmospheric window of 3-5μm in mid-infrared and 8-14μm in far infrared. It is widely used in infrared reconnaissance, infrared night vision, infrared guidance, infrared countermeasures, infrared search and other fields. Current infrared stealth measures mainly change the transmission path, characteristics and intensity of target infrared radiation through low-emissivity coatings, smoke screens, heat insulation shielding, cooling, decoy interference and other methods, intending to reduce the difference in thermal radiation between the target and the background environment, thereby reducing the probability of being discovered by enemy infrared detectors. In the visible light band of 0.38-0.78μm, the detection of the reconnaissance system mainly depends on the contrast characteristics of visual parameters such as chromaticity and brightness between the target and the background. Current visible light stealth measures mainly include camouflage stealth, camouflage net stealth and other technologies. Camouflage stealth is to apply color paint directly to the target surface, while camouflage nets are used to cover the exposure signs of equipment targets to achieve low detectable stealth fabric. At present, the main way to achieve visible light and infrared compatible stealth is to use low infrared emissivity paint, which is usually composed of visible light coloring materials or integrated materials coated with low infrared emissivity materials, but its emissivity is still high (about 0.5).

[0003] Although the current traditional stealth material technology for single-band reconnaissance and detection of visible light or infrared is very mature and widely used in practice, achieving multi-spectrum compatible stealth that is compatible with both is still an important technical challenge. Metamaterial technology has the ability to selectively control the visible spectrum-infrared radiation-microwave absorption and penetration characteristics, achieving multi-optical functions that traditional electromagnetic materials cannot meet while taking into account the integrated effect, and is gaining increasing attention. It also provides an important solution for multi-band compatible stealth technology. Summary of the invention

[0004] In view of the above-mentioned prior art, the present invention provides a bimetallic transparent infrared stealth meta-film. The present invention uses the bimetallic heterogeneous film system microstructure design technology to carry out the coordinated integrated design of visible light transmission and infrared reflection, and manipulates the transmission characteristics of visible light-infrared light waves inside the material structure according to human will, and provides a new bimetallic transparent infrared stealth meta-film material, which can be applied to the cockpit, engine cover and other parts of mobile ground equipment, and can realize the visible light and infrared compatible stealth function.

[0005] The present invention is achieved through the following technical solutions:

[0006] A bimetallic transparent infrared stealth meta-film, whose heterogeneous film system structure is: D / M2 / S / M1 / Z, wherein the material of the Z film layer is selected from ZnTe or ZnSe; the M1 film layer and the M2 film layer are metal film layers, and their materials are selected from metal materials such as Ag, Au, Cu, and the materials of the M1 film layer and the M2 film layer are different; the material of the intermediate S film layer is selected from doped wide bandgap semiconductor materials ATO (antimony-doped SnO2) or FTO (fluorine-doped SnO2) and the like; the material of the D film layer is selected from MgO or TiO2; the thickness of the Z film layer, the S film layer, and the D film layer are all 20 to 60 nm, and the thickness of the M1 film layer and the M2 film layer are all 5 to 15 nm.

[0007] The bimetallic transparent infrared stealth meta-film is used as or in the preparation of visible light and infrared compatible stealth materials.

[0008] Furthermore, in specific applications, the D film layer, M2 film layer, S film layer, M1 film layer and Z film layer can be deposited on the surface of the transparent substrate from bottom to top in sequence by magnetron sputtering, vacuum evaporation and other methods, so as to prepare the bimetallic transparent infrared stealth meta-film with high precision.

[0009] Furthermore, the transparent substrate includes a flexible substrate and a rigid substrate, the material of the flexible substrate is selected from polyethylene terephthalate (PET), polyetheretherketone (PEEK), polyphenylene sulfide (PPS), etc.; the material of the rigid substrate is selected from ITO (indium tin oxide), AZO (aluminum-doped zinc oxide), FTO, etc.

[0010] The bimetallic transparent infrared stealth meta-film of the present invention realizes the induced enhancement effect of visible light transmission and mid-to-far infrared reflection by embedding a heterogeneous film configuration design method of a bimetallic film layer at the nanoscale. It utilizes the infrared reflection and visible light penetration properties of nanoscale metal films, and utilizes the multilayer film interference, admittance matching and other action mechanisms of the bimetallic film structure, thereby achieving an infrared stealth effect with dual functions of high transparency in the visible light band of 0.38 to 0.78 μm and low radiation in the mid-to-far infrared band of 3 to 15 μm.

[0011] The bimetallic transparent infrared stealth meta-film material technology of the present invention, through artificial configuration design means, cleverly utilizes the infrared reflection and visible light transmittance of nanoscale metal films, as well as the admittance matching induced enhancement effect between the nanoscale metal film and the surrounding film system structure, to achieve good transparency in a wide range of 0.38-0.78μm visible light band, and exhibits high reflection (i.e., low radiation) characteristics in the entire mid-to-15μm and far-infrared bands. It can be directly attached to the camouflage coating surface of active equipment like an infrared "invisibility cloak", achieving a visible and infrared compatible stealth effect.

[0012] Various terms and phrases used herein have the general meanings that are well known to those skilled in the art. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 :Schematic diagram of D / M2 / S / M1 / Z stacking configuration film system structure.

[0014] Figure 2 : Schematic diagram of the visible light transmission spectrum characteristics of the TiO2 / Cu / ATO / Ag / ZnTe bimetallic film structure.

[0015] Figure 3 : Schematic diagram of infrared reflection spectrum characteristics of TiO2 / Cu / ATO / Ag / ZnTe bimetallic film structure.

[0016] Figure 4 Schematic diagram of the visible light transmission spectrum characteristics of the MgO / Cu / FTO / Au / ZnSe bimetallic film structure.

[0017] Figure 5 Schematic diagram of the infrared reflection spectrum characteristics of the MgO / Cu / FTO / Au / ZnSe bimetallic film structure. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the embodiments. However, the scope of the present invention is not limited to the following embodiments. It will be appreciated by those skilled in the art that various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention.

[0019] The instruments, reagents, and materials involved in the following examples, unless otherwise specified, are all conventional instruments, reagents, and materials available in the prior art and can be obtained through regular commercial channels. The experimental methods, detection methods, etc. involved in the following examples, unless otherwise specified, are all conventional experimental methods and detection methods available in the prior art.

[0020] Example 1 Bimetallic transparent infrared stealth meta-film material

[0021] A bimetallic film system structure with a stacking configuration of D / M2 / S / M1 / Z is deposited from bottom to top on the surface of a 1 mm thick transparent rigid ITO glass substrate. The schematic diagram of the structure is shown in the figure. Figure 1As shown in the figure, the infrared reflection and visible light penetration performance of nano-scale metal films are utilized, and the multi-layer film interference and admittance matching of the bimetallic film structure are also used to achieve the synergistic integrated enhancement effect of visible light transmission and infrared bandgap. Among them, the material of the outermost Z film layer is ZnTe with a thickness of 20nm; the material of the M1 film layer is Ag with a thickness of 15nm; the material of the middle S film layer is ATO with a thickness of 30nm; the material of the M2 film layer is Cu with a thickness of 5nm; the material of the innermost D film layer is TiO2 with a thickness of 60nm.

[0022] The transmittance of the bimetallic heterogeneous film structure of the TiO2 / Cu / ATO / Ag / ZnTe stacking configuration in the visible light band of 0.38-0.8μm was simulated and analyzed. The results are as follows Figure 2 As shown; its reflectivity in the mid-to-far infrared band of 3 to 15 µm is as follows Figure 3 As shown. Figure 2 It can be seen that the transmittance of the bimetallic heterogeneous film structure in the range of 0.44 to 0.78 μm is more than 50%, and its average transmittance in the entire visible light band is 72.54%, so it has relatively high transparency. Figure 3 It can be seen that the reflectivity of the film structure in the mid-to-far infrared band of 3 to 15 μm is greater than 65%, and the average reflectivity in the entire mid-to-far infrared band is 85.57%. Therefore, it has a wide-range infrared stealth capability covering the mid-to-far infrared window area.

[0023] In summary, the TiO2 / Cu / ATO / Ag / ZnTe bimetallic film structure can achieve a high level of infrared low-radiation stealth capability. Therefore, the bimetallic transparent infrared stealth meta-film material can be attached to the surface of the engine shield of mobile ground equipment like a "stealth cloak", suppressing infrared radiation without affecting the visual stealth of the visible light camouflage coating, achieving a visible light and infrared compatible stealth effect.

[0024] Example 2 Bimetallic transparent infrared stealth meta-film material

[0025] A bimetallic film system structure of D / M2 / S / M1 / Z stacking configuration is plated from bottom to top on the surface of a 0.15 mm thick transparent flexible PET glass substrate. By making full use of the infrared reflection and visible light penetration performance of nano-scale metal films, and also using the multilayer film interference and admittance matching mechanisms of the bimetallic film system structure, the synergistic integrated enhancement effect of visible light transmission and infrared bandgap is achieved. Among them, the material of the outermost Z film layer is ZnSe with a thickness of 30 nm; the material of the M1 film layer is Au with a thickness of 10 nm; the material of the middle S film layer is FTO with a thickness of 60 nm; the material of the M2 film layer is Cu with a thickness of 5 nm; the material of the innermost D film layer is MgO with a thickness of 40 nm.

[0026] The transmittance of the bimetallic heterogeneous film structure of MgO / Cu / FTO / Au / ZnSe stacking configuration in the visible light band of 0.38-0.8 μm was simulated and analyzed. The results are as follows Figure 4 As shown; its reflectivity in the mid-to-far infrared band of 3 to 15 μm is as follows Figure 5 As shown. Figure 4 It can be seen that the transmittance of the bimetallic heterogeneous film structure in the range of 0.54-0.78 μm is more than 50%, and its average transmittance in the entire visible light band is 55.24%, so it has relatively good transparency to a certain extent. Figure 3 It can be seen that the reflectivity of the film structure in the mid-to-far infrared band of 3 to 15 μm is greater than 66%, and the average reflectivity in the entire mid-to-far infrared band is 86.26%. Therefore, it has a wide-range infrared stealth capability covering the mid-to-far infrared window area.

[0027] In summary, the MgO / Cu / FTO / Au / ZnSe bimetallic film structure can achieve a relatively good level of transparency and low-radiation infrared stealth capability. Therefore, the bimetallic transparent infrared stealth meta-film material can be attached to the side windows of the cab of mobile ground equipment like a piece of "invisibility cloak", which can achieve infrared stealth function under certain visual conditions, and can also block the heat exchange between the cab and the external environment to achieve temperature control effect.

[0028] The above examples are provided to those skilled in the art to fully disclose and describe how to make and use the claimed embodiments, and are not intended to limit the scope of the disclosure herein. Modifications that are obvious to those skilled in the art will fall within the scope of the appended claims.

Claims

1. A bimetallic transparent infrared stealth metafilm, characterized in that: Its heterogeneous film system structure is: D / M2 / S / M1 / Z, wherein the material of the Z film layer is selected from ZnTe or ZnSe; the materials of the M1 film layer and the M2 film layer are selected from Ag, Au, and Cu, and the materials of the M1 film layer and the M2 film layer are different; the material of the S film layer is selected from ATO or FTO; the material of the innermost D film layer is selected from MgO or TiO2; the thickness of the Z film layer, the S film layer, and the D film layer are all 20 to 60 nm, and the thickness of the M1 film layer and the M2 film layer are all 5 to 15 nm.

2. The bimetallic transparent infrared stealth meta-film according to claim 1, characterized in that: The material of the Z film layer is ZnTe with a thickness of 20 nm; the material of the M1 film layer is Ag with a thickness of 15 nm; the material of the S film layer is ATO with a thickness of 30 nm; the material of the M2 film layer is Cu with a thickness of 5 nm; and the material of the D film layer is TiO2 with a thickness of 60 nm.

3. The bimetallic transparent infrared stealth meta-film according to claim 1, characterized in that: The material of the Z film layer is ZnSe with a thickness of 30 nm; the material of the M1 film layer is Au with a thickness of 10 nm; the material of the S film layer is FTO with a thickness of 60 nm; the material of the M2 film layer is Cu with a thickness of 5 nm; and the material of the D film layer is MgO with a thickness of 40 nm.

4. Use of the bimetallic transparent infrared stealth meta-film according to any one of claims 1 to 3 as or in the preparation of visible light and infrared compatible stealth materials.

5. The use according to claim 4, characterized in that: A D film layer, an M2 film layer, an S film layer, an M1 film layer and a Z film layer are deposited on the surface of a transparent substrate in sequence from bottom to top by magnetron sputtering or vacuum evaporation to prepare a bimetallic transparent infrared stealth meta-film.

6. The use according to claim 5, characterized in that: The material of the transparent substrate is selected from polyethylene terephthalate, polyetheretherketone, polyphenylene sulfide, ITO, AZO, and FTO.

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