CN115332811B - Infrared electromagnetic periodic structure with adjustable emissivity and beam anisotropic reflection function - Google Patents
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Abstract
Description
技术领域Technical Field
本发明属于红外电磁波束控制超材料、电磁吸波材料领域，具体涉及一种兼具发射率可调及波束异向反射功能的红外电磁周期结构。The present invention belongs to the field of infrared electromagnetic wave beam control metamaterials and electromagnetic wave absorbing materials, and specifically relates to an infrared electromagnetic periodic structure with adjustable emissivity and beam anisotropic reflection functions.
背景技术Background technique
红外辐射控制技术在众多领域具有重要的应用价值，尤其在分子生物传感、辐射制冷、红外信息探测及通讯、军事红外伪装等方面战略意义重大。相较于传统红外辐射控制材料，基于微纳结构的红外电磁超材料由于结构设计多样化，可实现的功能愈发的多样化、集成化。目前应用于红外伪装的材料，大多为低发射率涂层或具有选择性吸收功能的电磁超材料，通常仅具备对目标自身发射率的控制特性，无法实现对目标体发射率的动态调控及红外探测光束(波长为10.6μm的中红外光)的异向偏转。Infrared radiation control technology has important application value in many fields, especially in molecular biosensing, radiation cooling, infrared information detection and communication, military infrared camouflage and other aspects. Compared with traditional infrared radiation control materials, infrared electromagnetic metamaterials based on micro-nano structures have diversified structural designs and increasingly diversified and integrated functions. Currently, most of the materials used for infrared camouflage are low-emissivity coatings or electromagnetic metamaterials with selective absorption functions, which usually only have the control characteristics of the target's own emissivity, and cannot achieve dynamic regulation of the target's emissivity and anisotropic deflection of the infrared detection beam (mid-infrared light with a wavelength of 10.6μm).
发明内容Summary of the invention
本发明的目的在于，针对背景技术存在的缺陷，提出了一种兼具发射率可调及波束异向反射功能的红外电磁周期结构。The purpose of the present invention is to propose an infrared electromagnetic periodic structure with adjustable emissivity and beam anisotropic reflection functions in view of the defects of the background technology.
为实现上述目的，本发明采用的技术方案如下：To achieve the above purpose, the technical solution adopted by the present invention is as follows:
一种兼具发射率可调及波束异向反射功能的红外电磁周期结构，包括衬底，以及位于衬底之上的、M×N阵列排列的多功能结构单元；An infrared electromagnetic periodic structure with adjustable emissivity and beam anisotropic reflection functions, comprising a substrate, and multifunctional structural units arranged in an M×N array and located on the substrate;
所述多功能结构单元由K个1×K排列的单元组成，所述单元的相位补偿值自左向右从2π/K到2π、以2π/K的间隔等间距依次递增设置，所述单元包括自下而上依次设置的金属衬底层1、第二相变材料层2、低折射率低损耗电磁匹配层3、高折射率低损耗电磁匹配层4和第一相变材料层5；The multifunctional structural unit is composed of K units arranged in 1×K, and the phase compensation values of the units are arranged from 2π/K to 2π from left to right, and are arranged in an equal interval of 2π/K. The unit includes a metal substrate layer 1, a second phase change material layer 2, a low refractive index and low loss electromagnetic matching layer 3, a high refractive index and low loss electromagnetic matching layer 4 and a first phase change material layer 5, which are arranged in sequence from bottom to top;
每个单元中，金属衬底层1的长为16.8μm、宽为4.4μm，第二相变材料层2的长为16.8μm、宽为4.4μm，低折射率低损耗电磁匹配层3的长为16.8μm、宽为4.4μm，高折射率低损耗电磁匹配层4的长b为3.6μm、宽a为1.1μm，第一相变材料层5的长b为3.6μm、宽a为1.1μm。In each unit, the length of the metal substrate layer 1 is 16.8 μm and the width is 4.4 μm, the length of the second phase change material layer 2 is 16.8 μm and the width is 4.4 μm, the length of the low refractive index and low loss electromagnetic matching layer 3 is 16.8 μm and the width is 4.4 μm, the length b of the high refractive index and low loss electromagnetic matching layer 4 is 3.6 μm and the width a is 1.1 μm, and the length b of the first phase change material layer 5 is 3.6 μm and the width a is 1.1 μm.
其中，M为大于或等于4的整数，K为大于或等于4的整数，N为大于1的整数。Wherein, M is an integer greater than or equal to 4, K is an integer greater than or equal to 4, and N is an integer greater than 1.
进一步的，所述金属衬底层1为Ag、Au、Al等，厚度为0.1μm。Furthermore, the metal substrate layer 1 is made of Ag, Au, Al, etc., and has a thickness of 0.1 μm.
进一步的，所述第一相变材料层5和第二相变材料层2采用相对介电常数随温度的变化而变化的材料，具体为VO2材料，其在室温下呈现介质态、在高温下相变为金属态。所述第一相变材料层5的厚度为0.1μm，第二相变材料层2的厚度为0.3μm。Furthermore, the first phase change material layer 5 and the second phase change material layer 2 are made of a material whose relative dielectric constant changes with temperature, specifically VO2 material, which is in a dielectric state at room temperature and changes to a metallic state at high temperature. The thickness of the first phase change material layer 5 is 0.1 μm, and the thickness of the second phase change material layer 2 is 0.3 μm.
进一步的，所述低折射率低损耗电磁匹配层3采用折射率为2.5、且损耗角正切值低于0.01的材料，具体为Si、MgF2，厚度为0.26μm。Furthermore, the low-refractive-index and low-loss electromagnetic matching layer 3 is made of a material with a refractive index of 2.5 and a loss tangent value lower than 0.01, specifically Si and MgF 2 , and has a thickness of 0.26 μm.
进一步的，所述高折射率低损耗电磁匹配层4采用折射率为5、且损耗角正切值低于0.01的材料，具体为PbTe，厚度为0.8μm。Furthermore, the high-refractive-index and low-loss electromagnetic matching layer 4 is made of a material with a refractive index of 5 and a loss tangent value lower than 0.01, specifically PbTe, and has a thickness of 0.8 μm.
与现有技术相比，本发明的有益效果为：Compared with the prior art, the present invention has the following beneficial effects:
1、本发明提供的一种兼具发射率可调及波束异向反射功能的红外电磁周期结构，通过高折射率低损耗电磁匹配层实现探测光束的异向偏转，同时，采用多层介质的结构，在常温下实现了3-14μm波段的低发射率(等效发射率为0.34)，有效降低了目标体被探测的概率，满足军事领域对红外辐射抑制要求。1. The present invention provides an infrared electromagnetic periodic structure with adjustable emissivity and beam anisotropic reflection functions, which realizes the anisotropic deflection of the detection beam through a high-refractive-index, low-loss electromagnetic matching layer. At the same time, a multi-layer dielectric structure is adopted to achieve low emissivity in the 3-14μm band (equivalent emissivity is 0.34) at room temperature, effectively reducing the probability of the target being detected and meeting the requirements for infrared radiation suppression in the military field.
2、本发明提供的一种兼具发射率可调及波束异向反射功能的红外电磁周期结构，通过引入对温度敏感的相变材料氧化钒，利用其在高温相变后的金属相特性，采用金属-介质-金属的结构，实现了3-14μm波段发射率动态调制，在高温下具有较高的电磁损耗并在中红外波段(3μm-14μm)具有较高的发射率(等效发射率为0.92)，满足了对目标体的辐射降温效果。2. The present invention provides an infrared electromagnetic periodic structure with adjustable emissivity and beam anisotropic reflection functions. By introducing the temperature-sensitive phase change material vanadium oxide, utilizing its metallic phase characteristics after high-temperature phase change, and adopting a metal-dielectric-metal structure, dynamic modulation of emissivity in the 3-14μm band is achieved. It has higher electromagnetic loss at high temperature and higher emissivity in the mid-infrared band (3μm-14μm) (equivalent emissivity is 0.92), which meets the radiation cooling effect on the target body.
3、本发明提供的一种兼具发射率可调及波束异向反射功能的红外电磁周期结构，采用两层相变材料层，在高温状态下，两层相变材料层(2和5)发生相变，由红外低损耗介质态变为红外高损耗的金属态，此时第一相变材料层5和第二相变材料层2带来的介质损耗增加，且该损耗为驻波损耗，具有宽带效应。同时，相变后的第一相变材料层5可视为金属层，此时，该结构自上而下可视为金属(层5)-介质(层4、3)-金属(层2、1)的“三明治”结构，该结构中金属层(层5、2、1)的上下表面激励出反向平行的电流。在外界电磁场的作用下，反向平行流动的电流以及中间介质层中的位移电流构成了一个闭合电流环路。闭合电流环路中的感应磁通量在外界时谐电磁场的作用下不断的变化并产生感应电动势。这一感应磁场与外界磁场共同作用产生了强烈的磁谐振，使得结构中的局域磁场强度得到了极大的增强。此时该结构利用其强烈的磁谐振所产生的损耗，进一步增强了电磁周期结构的吸收率/发射率。综上，本发明采用两层相变材料层，可实现在高温下中红外波段具有宽带且较高发射率的效果。3. The present invention provides an infrared electromagnetic periodic structure with adjustable emissivity and beam anisotropic reflection functions, which uses two layers of phase change material layers. Under high temperature, the two layers of phase change material layers (2 and 5) undergo phase change, changing from an infrared low-loss dielectric state to an infrared high-loss metal state. At this time, the dielectric loss brought by the first phase change material layer 5 and the second phase change material layer 2 increases, and the loss is a standing wave loss, which has a broadband effect. At the same time, the first phase change material layer 5 after phase change can be regarded as a metal layer. At this time, the structure can be regarded as a "sandwich" structure of metal (layer 5)-medium (layers 4, 3)-metal (layers 2, 1) from top to bottom, and the upper and lower surfaces of the metal layers (layers 5, 2, 1) in the structure excite anti-parallel currents. Under the action of the external electromagnetic field, the anti-parallel currents and the displacement current in the intermediate dielectric layer form a closed current loop. The induced magnetic flux in the closed current loop changes continuously under the action of the external time-harmonic electromagnetic field and generates an induced electromotive force. This induced magnetic field and the external magnetic field work together to produce a strong magnetic resonance, which greatly enhances the local magnetic field strength in the structure. At this time, the structure uses the losses generated by its strong magnetic resonance to further enhance the absorptivity/emissivity of the electromagnetic periodic structure. In summary, the present invention uses two layers of phase change material to achieve a broadband and high emissivity effect in the mid-infrared band at high temperatures.
4、本发明提供的一种兼具发射率可调及波束异向反射功能的红外电磁周期结构，金属衬底层1、第二相变材料层2和低折射率低损耗电磁匹配层3为连续薄膜，高折射率低损耗电磁匹配层4和第一相变材料层5为位于薄膜之上的长方体，不同旋转角的长方体带来的空间相位补偿与极化选择性(LCP极化波与RCP极化波)赋予了该结构对红外探测光束(波长为10.6μm的中红外光)的交叉极化反射波的异向反射特性。4. The present invention provides an infrared electromagnetic periodic structure with adjustable emissivity and beam anisotropic reflection functions, wherein the metal substrate layer 1, the second phase change material layer 2 and the low refractive index and low loss electromagnetic matching layer 3 are continuous films, and the high refractive index and low loss electromagnetic matching layer 4 and the first phase change material layer 5 are rectangular blocks located on the films. The spatial phase compensation and polarization selectivity (LCP polarized wave and RCP polarized wave) brought by the rectangular blocks with different rotation angles give the structure anisotropic reflection characteristics for the cross-polarized reflected waves of the infrared detection beam (mid-infrared light with a wavelength of 10.6 μm).
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
图1为本发明提供的一种兼具发射率可调及波束异向反射功能的红外电磁周期结构的单元结构示意图；FIG1 is a schematic diagram of a unit structure of an infrared electromagnetic periodic structure with adjustable emissivity and beam anisotropic reflection functions provided by the present invention;
图2为本发明提供的一种兼具发射率可调及波束异向反射功能的红外电磁周期结构的示意图，其中θ角为相位补偿结构(低折射率低损耗电磁匹配层3、高折射率低损耗电磁匹配层4和第一相变材料层5)的旋转角，对应补偿相位为2θ；FIG2 is a schematic diagram of an infrared electromagnetic periodic structure with adjustable emissivity and beam anisotropic reflection function provided by the present invention, wherein the angle θ is the rotation angle of the phase compensation structure (the low refractive index and low loss electromagnetic matching layer 3, the high refractive index and low loss electromagnetic matching layer 4 and the first phase change material layer 5), and the corresponding compensation phase is 2θ;
图3为一维条件下实施例提供的兼具发射率可调及波束异向反射功能的红外电磁周期结构中，1个单元的电磁波极化转换率(PCR)及反射相位图；其中，(a)入射波为LCP模式时的极化转换率，(b)入射波为LCP模式时，反射波为其交叉极化波RCP的反射相位；FIG3 is a diagram of the electromagnetic wave polarization conversion rate (PCR) and reflection phase of one unit in an infrared electromagnetic periodic structure with adjustable emissivity and beam anisotropic reflection functions provided by an embodiment under one-dimensional conditions; wherein (a) the polarization conversion rate when the incident wave is in the LCP mode, and (b) the reflection phase of the reflected wave being the cross-polarized wave RCP when the incident wave is in the LCP mode;
图4为一维条件下实施例提供的兼具发射率可调及波束异向反射功能的红外电磁周期结构对波长为10.6μm的交叉极化反射波束电场分布图；FIG4 is a diagram showing the electric field distribution of a cross-polarized reflected beam with a wavelength of 10.6 μm for an infrared electromagnetic periodic structure with adjustable emissivity and beam anisotropic reflection functions provided by an embodiment under one-dimensional conditions;
图5为实施例的兼具发射率可调及波束异向反射功能的红外电磁周期结构在3-14μm范围的发射率可调辐射光谱图。FIG5 is a diagram showing a radiation spectrum of an infrared electromagnetic periodic structure with adjustable emissivity and beam anisotropic reflection functions in the range of 3-14 μm.
具体实施方式Detailed ways
下面结合附图和实施例，详述本发明的技术方案。The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings and embodiments.
实施例Example
如图1和图2所示，为实施例提供的兼具发射率可调及波束异向反射功能的红外电磁周期结构；包括衬底，以及位于衬底之上的、4×2阵列排列的多功能结构单元；多功能结构单元由4个1×4排列的单元组成，4个单元的相位补偿值自左向右依次为π/2，π，3π/2，2π，所述单元包括自下而上依次设置的金属衬底层1、第二相变材料层2、低折射率低损耗电磁匹配层3、高折射率低损耗电磁匹配层4和第一相变材料层5。其中，金属衬底层1为Ag金属反射层(长度＝16.8μm，宽度＝4.4μm，厚度h＝0.1μm)，第二相变材料层2为VO2介质层(长度＝16.8μm，宽度＝4.4μm，厚度h＝0.3μm)，低折射率低损耗电磁匹配层3为Si介质层(长度＝16.8μm，宽度＝4.4μm，厚度h＝0.26μm)，高折射率低损耗电磁匹配层4为PbTe层(长度＝3.6μm，宽度＝1.1μm，厚度h＝0.8μm)，第一相变材料层5为VO2介质层(长度＝3.6μm，宽度＝1.1μm，厚度h＝0.1μm)。As shown in Figures 1 and 2, an infrared electromagnetic periodic structure with adjustable emissivity and beam anisotropic reflection functions is provided in an embodiment; it includes a substrate, and a multifunctional structural unit arranged in a 4×2 array and located on the substrate; the multifunctional structural unit is composed of 4 units arranged in a 1×4 array, and the phase compensation values of the 4 units are π/2, π, 3π/2, and 2π from left to right, respectively. The unit includes a metal substrate layer 1, a second phase change material layer 2, a low refractive index and low loss electromagnetic matching layer 3, a high refractive index and low loss electromagnetic matching layer 4 and a first phase change material layer 5, which are arranged in sequence from bottom to top. Among them, the metal substrate layer 1 is an Ag metal reflective layer (length = 16.8 μm, width = 4.4 μm, thickness h = 0.1 μm), the second phase change material layer 2 is a VO2 dielectric layer (length = 16.8 μm, width = 4.4 μm, thickness h = 0.3 μm), the low refractive index and low loss electromagnetic matching layer 3 is a Si dielectric layer (length = 16.8 μm, width = 4.4 μm, thickness h = 0.26 μm), the high refractive index and low loss electromagnetic matching layer 4 is a PbTe layer (length = 3.6 μm, width = 1.1 μm, thickness h = 0.8 μm), and the first phase change material layer 5 is a VO2 dielectric layer (length = 3.6 μm, width = 1.1 μm, thickness h = 0.1 μm).
图3为一维条件下实施例提供的兼具发射率可调及波束异向反射功能的红外电磁周期结构中，1个单元的电磁波极化转换率(PCR)及反射相位图；其中，(a)入射波为LCP模式时的极化转换率，(b)入射波为LCP模式时，反射波为其交叉极化波RCP的反射相位。由图3可知，1个单元的相位调控结构(高折射率低损耗电磁匹配层4和第一相变材料层5)在不同旋转角下28.3THz处的极化转化率及电磁相位响应特性及电磁相位响应(λ0＝10.6μm，f0＝28.3THz)依次为：θ＝0°：Phase＝135°/PCR＝0.98；θ＝45°：Phase＝45°/PCR＝0.98；θ＝90°：Phase＝-45°/PCR＝0.98；θ＝135°：Phase＝-135°/PCR＝0.98。可知，一方面，每个单元在λ0＝10.6μm(f0＝28.3THz)的极化转换率均满足|PCR|>0.9的条件，确保该超材料的高效工作性能；另一方面，4个单元对交叉极化波的反射电场Ex的相位响应均覆盖了0-2π的范围，将其沿X方向一维排列便组成了电磁相位响应梯度渐变(LCP模式反射波相位梯度为ΔPhaseEx＝90°)的子阵列。最终将子阵列在笛卡尔坐标系中沿X方向周期排列所形成的超材料可实现对反射交叉极化电磁波束的异向偏折效果。Figure 3 shows the electromagnetic wave polarization conversion rate (PCR) and reflection phase diagram of one unit in an infrared electromagnetic periodic structure with adjustable emissivity and beam anisotropic reflection functions provided by an embodiment under one-dimensional conditions; among them, (a) the polarization conversion rate when the incident wave is in LCP mode, and (b) when the incident wave is in LCP mode, the reflected wave is the reflection phase of its cross-polarization wave RCP. As can be seen from Figure 3, the polarization conversion rate and electromagnetic phase response characteristics and electromagnetic phase response (λ 0 = 10.6μm , f 0 =28.3THz) of the phase control structure of one unit (high refractive index low loss electromagnetic matching layer 4 and first phase change material layer 5) at 28.3THz at different rotation angles are: θ=0°: Phase=135°/PCR=0.98; θ=45°: Phase=45°/PCR=0.98; θ=90°: Phase=-45°/PCR=0.98; θ=135°: Phase=-135°/PCR=0.98. It can be seen that, on the one hand, the polarization conversion rate of each unit at λ 0 =10.6μm (f 0 =28.3THz) satisfies the condition of |PCR|>0.9, ensuring the efficient working performance of the metamaterial; on the other hand, the phase response of the four units to the reflected electric field Ex of the cross-polarized wave covers the range of 0-2π, and the one-dimensional arrangement along the X direction forms a sub-array with a gradual change in the electromagnetic phase response gradient (the phase gradient of the LCP mode reflected wave is ΔPhase Ex =90°). Finally, the metamaterial formed by periodically arranging the sub-array along the X direction in the Cartesian coordinate system can achieve the effect of anisotropic deflection of the reflected cross-polarized electromagnetic wave beam.
图4为一维条件下实施例提供的兼具发射率可调及波束异向反射功能的红外电磁周期结构对波长为10.6μm的交叉极化反射波束电场分布图；由图4可知，当入射红外波为LCP模式时，电磁周期结构对沿-Z方向垂直入射平面波的交叉极化波(RCP模式)的反射电场Ex如图所示。与传统材料界面处电场垂直反射特征不同，此时反射电场Ex呈现异常的散射现象。首先电场Ex强弱呈现规律的交替分布，其中等场强线为波前，与波前垂直的箭头为波前向。因此判断反射电磁波形成了稳定的波束指向，规律分布的波前向证明Ex反射场可在空间中沿箭头指向的方向有效传输；其次，波前向箭头与Z轴相交形成一个夹角θEx即为异常散射角。θEx可依据广义斯涅尔定律计算获得：FIG4 is a diagram showing the electric field distribution of a cross-polarized reflected beam with a wavelength of 10.6 μm for an infrared electromagnetic periodic structure with adjustable emissivity and beam anisotropic reflection functions provided by an embodiment under one-dimensional conditions; as shown in FIG4 , when the incident infrared wave is in LCP mode, the reflected electric field Ex of the electromagnetic periodic structure to the cross-polarized wave (RCP mode) incident perpendicularly to the plane wave in the -Z direction is shown in the figure . Different from the vertical reflection characteristics of the electric field at the interface of traditional materials, the reflected electric field Ex at this time presents an abnormal scattering phenomenon. First, the strength of the electric field Ex presents a regular alternating distribution, in which the lines of equal field strength are the wavefront, and the arrow perpendicular to the wavefront is the wavefront direction. Therefore, it is judged that the reflected electromagnetic wave forms a stable beam direction, and the regularly distributed wavefront direction proves that the Ex reflected field can be effectively transmitted in the space in the direction indicated by the arrow; secondly, the wavefront direction arrow intersects with the Z axis to form an angle θ Ex , which is the abnormal scattering angle. θ Ex can be calculated based on the generalized Snell's law:
其中，λ表示为入射波波长(本结构中λ＝λ0＝10.6μm),N为超材料一维方向上覆盖0-2π相位的单元个数(本实施例中电磁周期结构对Ex反射电磁场相位响应每4个单元即可覆盖0-2π，即NEx＝4)，P为单元排列周期(本结构单元周期为P＝4.4μm)。由此可求得θEx＝39°，即该电磁周期结构对LCP模式的反射波束产生了39°的异向偏折效果。综上，本发明电磁周期结构成功实现对波长为10.6μm的LCP入射波束(RCP反射波束)的异向偏折功能。Wherein, λ represents the wavelength of the incident wave (λ=λ 0 =10.6μm in this structure), N is the number of units covering the 0-2π phase in the one-dimensional direction of the metamaterial (in this embodiment, the electromagnetic periodic structure can cover 0-2π for every 4 units of the Ex reflected electromagnetic field phase response, that is, N Ex =4), and P is the unit arrangement period (the unit period of this structure is P=4.4μm). It can be obtained that θ Ex =39°, that is, the electromagnetic periodic structure produces a 39° anisotropic deflection effect on the reflected beam of the LCP mode. In summary, the electromagnetic periodic structure of the present invention successfully realizes the anisotropic deflection function of the LCP incident beam (RCP reflected beam) with a wavelength of 10.6μm.
图5为实施例的兼具发射率可调及波束异向反射功能的红外电磁周期结构在3-14μm范围的发射率可调辐射光谱图。由图5可知，当样品处于常温(30℃)，在红外电磁波(LCP或RCP模式)垂直入射至电磁周期结构表面时，电磁周期结构在3-14μm具有较低发射率(等效发射率为0.34)；当样品处于相变温度(74℃)后，在红外电磁波(LCP或RCP模式)垂直入射至电磁周期结构表面时，电磁周期结构在3-14μm具有较高发射率(等效发射率为0.92)。由于电磁周期结构中存在PbTe层，在该波段内不可避免地引入了若干杂散电磁谐振响应，使低温时该电磁周期结构在3-10μm波段存在若干窄带发射峰，但根据图5可知对带内整体低发射率性能的影响极其有限。此外，电磁周期结构对于LCP/RCP模式的垂直入射波表现为相同的红外发射率特性，能够有效实现红外发射率可调的功能。FIG5 is a radiation spectrum diagram of the infrared electromagnetic periodic structure with adjustable emissivity and beam anisotropic reflection in the range of 3-14 μm. As shown in FIG5, when the sample is at room temperature (30°C), when the infrared electromagnetic wave (LCP or RCP mode) is vertically incident on the surface of the electromagnetic periodic structure, the electromagnetic periodic structure has a lower emissivity (equivalent emissivity of 0.34) in the range of 3-14 μm; when the sample is at the phase change temperature (74°C), when the infrared electromagnetic wave (LCP or RCP mode) is vertically incident on the surface of the electromagnetic periodic structure, the electromagnetic periodic structure has a higher emissivity (equivalent emissivity of 0.92) in the range of 3-14 μm. Due to the presence of the PbTe layer in the electromagnetic periodic structure, several stray electromagnetic resonance responses are inevitably introduced in this band, so that the electromagnetic periodic structure has several narrowband emission peaks in the 3-10 μm band at low temperatures, but according to FIG5, it can be seen that the impact on the overall low emissivity performance in the band is extremely limited. In addition, the electromagnetic periodic structure exhibits the same infrared emissivity characteristics for the vertically incident waves of the LCP/RCP mode, which can effectively realize the function of adjustable infrared emissivity.
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