Optical radio frequency dual transparent artificial surface plasmonic structure and application thereof

Abstract

The application discloses an optical radio-frequency dual-transparent artificial surface plasmon structure and application thereof, and the structure comprises a transparent dielectric substrate and a quasi-one-dimensional metal wire structure unit on the transparent dielectric substrate. The optical radio-frequency dual-transparent artificial surface plasmon structure provided by the application excites surface plasmon modes by adopting the quasi-one-dimensional metal wire structure, and in the case of greatly reducing the metal area, most of electromagnetic energy is localized around and in the quasi-one-dimensional metal wire structure in the form of an electric field, so that the localization of the artificial surface plasmon structure is greatly improved, and excellent optical transparency and radio-frequency transparency characteristics are realized.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of artificial electromagnetic surfaces, and particularly relates to an optical radio frequency double-transparent artificial surface plasmon structure. BACKGROUND

[0002] Artificial surface plasmon is a new type of artificial electromagnetic super surface, which has high localization, significant slow wave characteristics and field enhancement effect in the microwave frequency band. Therefore, in the wireless communication system, artificial surface plasmon plays an important role in suppressing electromagnetic crosstalk, realizing device miniaturization, and improving antenna gain and scanning angle.

[0003] The current artificial surface plasmon implementation structure can be roughly divided into two types: one is to realize the electromagnetic mode of surface plasmon by using a three-dimensional block metal structure; the other is to realize the surface plasmon mode by using a two-dimensional planar metal structure.

[0004] However, whether it is a three-dimensional or two-dimensional metal artificial surface plasmon structure, it needs to rely on a large area of metal to realize the surface plasmon electromagnetic mode, so both cannot realize optical transparency or radio frequency transparency; and the local energy of electromagnetic energy needs to be improved, which hinders the development of many types of electromagnetic devices such as transparent devices, low radar scattering cross section devices, and high local electromagnetic devices. SUMMARY

[0005] In order to solve the above problems existing in the prior art, the present application provides an optical radio frequency double-transparent artificial surface plasmon structure, and a one-dimensional periodic arrangement is formed to form a comb-shaped artificial surface plasmon transmission line to verify its electric field distribution; a two-dimensional periodic arrangement is formed to form an artificial surface plasmon structure plane to verify its optical and radio frequency transmission rate. The technical problem to be solved by the present application is solved by the following technical scheme:

[0006] In the first aspect, the present application provides an optical radio frequency double-transparent artificial surface plasmon structure, which comprises a transparent dielectric substrate and a quasi-one-dimensional metal line structure unit located on the transparent dielectric substrate.

[0007] In an embodiment of the present application, the quasi-one-dimensional metal line structure is a rectangular structure with a groove on the upper edge, the length of which is p and the width of which is d; the metal line width of the upper edge where the groove is located and the lower edge opposite to it is w, and the metal line width of the other two sides is w / 2; the thickness of the metal line is t1; the depth of the groove is h and the width of the groove is a; wherein the value range of each parameter is as follows:

[0008] 0.1λ0<p<λ0, 0.1λ0<d<λ0, 0<h<d, 0<a<p, 0<w<0.1λ0, 0<t1<0.1λ0; wherein λ0 is the working wavelength of the designed artificial surface plasmon.

[0009] In an embodiment of the present application, the transparent dielectric substrate is a transparent PET dielectric substrate, whose dielectric constant is 3.3 and loss tangent is 0.003.

[0010] In an embodiment of the present application, the thickness of the transparent dielectric substrate is t2, and t2 is in the range of 0<t2<λ0, wherein λ0 is the working wavelength of the designed artificial surface plasmon.

[0011] In a second aspect, the present application provides an application of the optical radio frequency dual transparent artificial surface plasmon structure, which arranges a plurality of the optical radio frequency dual transparent artificial surface plasmon structures in one dimension to form a comb-shaped artificial surface plasmon transmission line based on quasi-one-dimensional metal line structure; wherein the plurality of quasi-one-dimensional metal line structure units are arranged in one dimension in a periodical manner, and the side edges of two adjacent quasi-one-dimensional metal line structure units are in close contact.

[0012] In an embodiment of the present application, the length p of the quasi-one-dimensional metal line structure unit is 5mm, the width d is 5mm; the metal line width w is 5μm; the metal line thickness t1 is 1μm; the depth h of the groove is 2mm, and the width a is 2mm.

[0013] In a third aspect, the present application provides another application of the optical radio frequency dual transparent artificial surface plasmon structure, which arranges a plurality of the optical radio frequency dual transparent artificial surface plasmon structures in two dimensions to form an artificial surface plasmon structure plane based on quasi-one-dimensional metal line structure; wherein the plurality of quasi-one-dimensional metal line structure units are arranged in two dimensions in a periodical manner: in two two-dimensional directions, the side edges of two adjacent quasi-one-dimensional metal line structure units are in close contact and cover the entire two-dimensional plane.

[0014] In an embodiment of the present application, the length p of the quasi-one-dimensional metal line structure unit is 5mm, the width d is 5mm; the metal line width w is 5μm; the metal line thickness t1 is 1μm; the depth h of the groove is 1mm, and the width a is 2mm.

[0015] The present application has the following beneficial effects:

[0016] The optical radio frequency double transparent artificial surface plasmon structure provided by the application excites surface plasmon mode by adopting quasi-one-dimensional metal line structure, and in the case of greatly reducing the metal area, most of electromagnetic energy is localized in the form of electric field around and inside the quasi-one-dimensional metal line structure, which greatly improves the localization of the artificial surface plasmon structure, and realizes excellent optical transparency and radio frequency transparency, so that the structure can be widely applied to transparent devices, low radar scattering cross section devices, high localization devices and many other types of electromagnetic devices and systems.

[0017] The application will be further described in detail below with reference to the drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of the optical radio frequency double transparent artificial surface plasmon structure provided by the embodiment one of the application;

[0019] Figure 2 is a structural schematic diagram of the comb-shaped artificial surface plasmon transmission line based on the quasi-one-dimensional metal line structure provided by the embodiment two of the application;

[0020] Figure 3 is a performance comparison diagram of the existing artificial surface plasmon transmission line and the comb-shaped artificial surface plasmon transmission line based on the quasi-one-dimensional metal line structure provided by the embodiment two of the application;

[0021] Figure 4 is a high localization field distribution diagram of the comb-shaped artificial surface plasmon transmission line based on the quasi-one-dimensional metal line structure provided by the embodiment two of the application;

[0022] Figure 5 is a structural schematic diagram of the artificial surface plasmon plane based on the quasi-one-dimensional metal line structure provided by the embodiment three of the application;

[0023] Figure 6 is a curve diagram of the optical transmittance and reflectance of the artificial surface plasmon plane based on the quasi-one-dimensional metal line structure provided by the embodiment three of the application, which changes with the line width;

[0024] Figure 7 is a curve diagram of the radio frequency transmittance and reflectance of the artificial surface plasmon plane based on the quasi-one-dimensional metal line structure provided by the embodiment three of the application, which changes with the line width. DETAILED DESCRIPTION

[0025] The application will be further described in detail below with reference to the drawings and embodiments.

[0026] Embodiment one

[0027] Please refer to Figure 1, Figure 1 is a schematic diagram of an optical radio frequency double transparent artificial surface plasmon structure provided by an embodiment of the present application, which comprises a transparent medium substrate 1 and a plurality of quasi-1D metal wire structure units 2 located on the transparent medium substrate 1.

[0028] In the quasi-1D metal wire structure unit 2, the upper edge with the groove 3 is a rectangular structure, the length is p, and the width is d; the metal wire width of the upper edge where the groove 3 is located and the lower edge opposite to it is w, and the metal wire width of the other two side edges is w / 2; the thickness of the metal wire is t1; the depth of the groove 3 is h, and the width is a; wherein the value range of each parameter is as follows:

[0029] 0.1λ0<p<λ0, 0.1λ0<d<λ0, 0<h<d, 0<a<p, 0<w<0.1λ0, 0<t1<0.1λ0; wherein λ0 is the working wavelength of the designed artificial surface plasmon.

[0030] In the embodiment, the transparent medium substrate 1 is a transparent PET medium substrate, the dielectric constant of which is 3.3, and the loss tangent is 0.003. The thickness of the transparent medium substrate 1 is t2, and the value range is 0<t2<λ0, which is 100μm in the embodiment.

[0031] The optical radio frequency double transparent artificial surface plasmon structure provided by the present application can excite surface plasmon mode by using quasi-1D metal wire structure, so that most of electromagnetic energy is localized around and inside the quasi-1D metal wire structure in the form of electric field under the condition of greatly reducing the metal area, which greatly improves the localization of the artificial surface plasmon structure, and simultaneously realizes excellent optical transparency and radio frequency transparency, so that the structure can be widely applied to transparent devices, low radar scattering cross section devices, high localization devices and many other types of electromagnetic devices and systems.

[0032] Embodiment two

[0033] On the basis of the above-mentioned embodiment one, the present application provides an application of the optical radio frequency double transparent artificial surface plasmon structure, which one-dimensionally arranges a plurality of optical radio frequency double transparent artificial surface plasmon structures provided by the above-mentioned embodiment one to form a comb-shaped artificial surface plasmon transmission line based on quasi-1D metal wire structure to verify the electric field distribution.

[0034] Specifically, please refer to Figure 2 , Figure 2 is a structure schematic diagram of a comb-shaped artificial surface plasmon transmission line based on quasi-1D metal wire structure provided by the embodiment two of the present application, wherein a plurality of quasi-1D metal wire structure units 2 are one-dimensionally and periodically arranged, and the side edges of adjacent two quasi-1D metal wire structure units 2 are in close contact.Figure 2 As shown in the figure, the embodiment arranges several quasi-one-dimensional metal line structure units 2 along the x direction to form a transmission line with a length of L.

[0035] Optionally, as an implementation manner, the length p of the quasi-one-dimensional metal line structure unit 2 in the embodiment is 5 mm, the width d is 5 mm, the metal line width w is 5 μm, the metal line thickness t1 is 1 μm, the groove 3 has a depth h of 2 mm and a width a of 2 mm. The length L of the transmission line can be set to 300 mm.

[0036] The embodiment uses the quasi-one-dimensional metal line structure to excite the surface plasmon mode, and in the case of greatly reducing the metal area, most of the electromagnetic energy is localized in the form of an electric field around and inside the quasi-one-dimensional metal line structure, greatly improving the localization of the artificial surface plasmon structure.

[0037] Generally, the enhancement of the localization of the artificial surface plasmon often shows strong binding of the spatial distribution of the electric field, reduction of the guided wave wavelength, and increase of the electric field amplitude. In order to further illustrate that the comb-shaped artificial surface plasmon transmission line based on the quasi-one-dimensional metal line structure provided by the embodiment has high localization, the performance of the comb-shaped artificial surface plasmon transmission line based on the quasi-one-dimensional metal line structure provided by the embodiment is compared with that of the existing two-dimensional and three-dimensional artificial surface plasmon transmission lines.

[0038] Please refer to Figure 3 , Figure 3 is a performance comparison diagram of the existing artificial surface plasmon transmission line provided by the second embodiment of the present application and the comb-shaped artificial surface plasmon transmission line based on the quasi-one-dimensional metal line structure of the present application; wherein, Figure 3 the a graph, the b graph and the c graph in the figure are respectively a cross-sectional electric field distribution comparison diagram of the surface plasmon transmission line formed by the existing three-dimensional metal structure, the surface plasmon transmission line formed by the existing two-dimensional metal structure and the comb-shaped artificial surface plasmon transmission line based on the quasi-one-dimensional metal line structure of the embodiment at a frequency of 8 GHz. By comparing the three graphs, it can be clearly seen that the comb-shaped artificial surface plasmon transmission line based on the quasi-one-dimensional metal line structure proposed in the embodiment binds the cross-sectional electric field in a smaller area, greatly improving its spatial binding.

[0039] Figure 3 The d graph in the figure also gives a dispersion curve comparison diagram of the three structures, wherein 3D SPPs, 2D SPPs and Quasi-1D SPPs respectively represent three-dimensional surface plasmons, two-dimensional surface plasmons and quasi-one-dimensional surface plasmons of the embodiment. It can be seen that the quasi-one-dimensional structure proposed in the embodiment has stronger dispersion characteristics at the same frequency, which means a shorter guided wave wavelength.

[0040] In addition, Figure 3 Fig. e and Fig. f show the electric field amplitude comparison of three transmission lines at 8GHz, it can be seen that compared with three-dimensional and two-dimensional structures, the field enhancement effect of artificial surface plasmons is improved by about 3 times.

[0041] Further, please refer to Figure 4 , Figure 4 The high-locality field distribution diagram (L=300mm) of the comb-shaped artificial surface plasmon transmission line based on the quasi-one-dimensional metal line structure of the embodiment is also given, it can be seen that in the frequency range of 6-10GHz, the surface plasmon electromagnetic mode is well excited, and the electromagnetic energy is tightly bound around the structure.

[0042] In summary, the quasi-one-dimensional artificial surface plasmon structure proposed in the embodiment can greatly improve electromagnetic locality in a wide frequency range, provide stronger field binding, shorter guided wave wavelength, and more significant field enhancement effect in the application of transmission lines.

[0043] Embodiment three

[0044] On the basis of the above-mentioned embodiment one, the embodiment further provides another application of the optical radio frequency dual-transparent artificial surface plasmon structure, which arranges a plurality of optical radio frequency dual-transparent artificial surface plasmon structures provided in the above-mentioned embodiment one in two dimensions to verify the optical and radio frequency transmittance.

[0045] Specifically, please refer to Figure 5 , Figure 5 is a structural schematic diagram of the artificial surface plasmon plane based on the quasi-one-dimensional metal line structure provided in the embodiment three, wherein a plurality of quasi-one-dimensional metal line structure units are arranged in two dimensions: in two two-dimensional directions, the side edges of two adjacent quasi-one-dimensional metal line structure units are in close contact and cover the entire two-dimensional plane. As shown in Figure 5 , the embodiment arranges a plurality of artificial surface plasmon structures in two-dimensional periodic arrangement to form a periodic structure surface of 10cm*10cm.

[0046] Optionally, as an implementation manner, the length p of the quasi-one-dimensional metal line structure unit in the embodiment is 5mm, the width d is 5mm; the metal line width w is 5μm; the metal line thickness t1 is 1μm; the groove depth h is 1mm, and the width a is 2mm.

[0047] The artificial surface plasmon structure provided in the embodiment realizes the optical transparency of the artificial surface plasmon structure for the first time, and simultaneously realizes the radio frequency transparency of the artificial surface plasmon structure for the first time. In order to verify the effect, the light transmittance and the radio frequency transmittance of the above-mentioned artificial surface plasmon structure are simulated. Please refer toFigure 6 , Figure 6 The optical transmittance and reflectance of the artificial surface plasmon plane based on the quasi-one-dimensional metal line structure of the embodiment are given in the variation curve diagram of the line width.

[0048] Figure 7 The radio frequency transmittance (S21) and reflectance (S11) of the artificial surface plasmon plane based on the quasi-one-dimensional metal line structure of the embodiment are given in the variation curve diagram of the line width. It can be seen that when the metal line width is 5 μm, the radio frequency transmittance (18-40 GHz) can reach more than 90%.

[0049] Therefore, the artificial surface plasmon plane based on the quasi-one-dimensional metal line structure proposed in the embodiment can realize the controllability of the transmission coefficient and the reflection coefficient by changing the metal line width. In particular, when the metal line width is 5 μm, the optical transmittance and the radio frequency transmittance (18-40 GHz) can both reach more than 90%, which realizes the optical transparency and the radio frequency transparency of the artificial surface plasmon structure for the first time.

[0050] The optical radio frequency dual-transparent artificial surface plasmon structure provided by the application excites the surface plasmon mode by adopting the quasi-one-dimensional metal line structure, so that most of the electromagnetic energy is localized around and inside the quasi-one-dimensional metal line structure in the form of an electric field under the condition of greatly reducing the metal area, greatly improves the localization of the artificial surface plasmon structure, and simultaneously realizes excellent optical transparency and radio frequency transparency characteristics, so that the structure can be widely applied to transparent devices, low radar scattering cross section devices, high localization devices and many other types of electromagnetic devices and systems.

[0051] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0052] Furthermore, descriptions of "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. mean that the particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the present application. The appearances of an illustrative expression of such phrases in various places in the specification are not necessarily referring to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the terminology "comprising" is used in the specification is open-ended and means including, but not limited to, also "consisting essentially of, "consisting of".

[0053] The above further describes the present application in detail in connection with specific preferred embodiments. It is to be understood that the specific implementation of the present application is not limited to these descriptions. For those skilled in the art, some simple deductions or replacements can be made without departing from the concept of the present application, and all of them shall be considered as falling within the protection scope of the present application.

Claims

1. An optically radio-frequency dual transparent artificial surface plasmonic structure, characterized in that, The application relates to an optical radio frequency dual-transparent artificial surface plasmon structure, which comprises a transparent medium substrate (1) and a quasi-one-dimensional metal wire structure unit (2) located on the transparent medium substrate (1); the quasi-one-dimensional metal wire structure unit (2) is a rectangular structure with a groove (3) on the upper edge, the length of the quasi-one-dimensional metal wire structure unit (2) is p, and the width of the quasi-one-dimensional metal wire structure unit (2) is d; the metal wire width of the upper edge where the groove (3) is located and the lower edge opposite to the upper edge is w, and the metal wire width of the other two side edges is w / 2; the thickness of the metal wire is t1; the depth of the groove (3) is h, and the width of the groove (3) is a; wherein the value ranges of each parameter are as follows: 0.1 lambda0 < p < lambda0, 0.1 lambda0 < d < lambda0, 0 < h < d, 0 < a < p, 0 < w < 0.1 lambda0, and 0 < t1 < 0.1 lambda0; wherein lambda0 is the working wavelength of the designed artificial surface plasmon. A plurality of quasi-one-dimensional metal wire structure units are arranged in two dimensions: in two two-dimensional directions, the side edges of adjacent two quasi-one-dimensional metal wire structure units are in close contact and cover the entire two-dimensional plane. The transparent medium substrate (1) is a transparent PET medium substrate, the dielectric constant of the transparent PET medium substrate is 3.3, and the loss tangent is 0.

003.

2. The optically radio-frequency dual transparent artificial surface plasmonic structure according to claim 1, wherein, The thickness of the transparent medium substrate (1) is t2, and the value range of t2 is 0 < t2 < lambda0, wherein lambda0 is the working wavelength of the designed artificial surface plasmon.

3. The optically RF dual transparent artificial surface plasmonic structure of claim 1, wherein, A plurality of optical radio frequency dual-transparent artificial surface plasmon structures according to any one of claims 1-3 are arranged in one dimension to form a quasi-one-dimensional metal wire structure-based comb-shaped artificial surface plasmon transmission line; wherein a plurality of quasi-one-dimensional metal wire structure units (2) are arranged in one dimension, and the side edges of adjacent two quasi-one-dimensional metal wire structure units (2) are in close contact.

4. Use of an optically radio-frequency dual transparent artificial surface plasmonic structure, characterized in that, The length p of the quasi-one-dimensional metal wire structure unit (2) is 5 mm, the width d of the quasi-one-dimensional metal wire structure unit (2) is 5 mm, the metal wire width w is 5 mu m, the metal wire thickness t1 is 1 mu m, the depth h of the groove (3) is 2 mm, and the width a of the groove (3) is 2 mm.

5. The use of an optically radio-frequency dual transparent artificial surface plasmonic structure according to claim 4, characterized in that, A plurality of optical radio frequency dual-transparent artificial surface plasmon structures according to any one of claims 1-3 are arranged in two dimensions to form a quasi-one-dimensional metal wire structure-based artificial surface plasmon plane; wherein a plurality of quasi-one-dimensional metal wire structure units (2) are arranged in two dimensions: in two two-dimensional directions, the side edges of adjacent two quasi-one-dimensional metal wire structure units (2) are in close contact and cover the entire two-dimensional plane.

6. Use of an optically radio-frequency dual transparent artificial surface plasmonic structure, characterized in that, The length p of the quasi-one-dimensional metal wire structure unit (2) is 5 mm, the width d of the quasi-one-dimensional metal wire structure unit (2) is 5 mm, the metal wire width w is 5 mu m, the metal wire thickness t1 is 1 mu m, the depth h of the groove (3) is 1 mm, and the width a of the groove (3) is 2 mm.

7. The use of an optically radio-frequency dual transparent artificial surface plasmonic structure according to claim 6, characterized in that, ​

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