WO2015199624A1 - Revêtement optique de blindage contre les interférences électromagnétiques à base de graphène - Google Patents

Revêtement optique de blindage contre les interférences électromagnétiques à base de graphène Download PDF

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Publication number
WO2015199624A1
WO2015199624A1 PCT/TR2014/000230 TR2014000230W WO2015199624A1 WO 2015199624 A1 WO2015199624 A1 WO 2015199624A1 TR 2014000230 W TR2014000230 W TR 2014000230W WO 2015199624 A1 WO2015199624 A1 WO 2015199624A1
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WO
WIPO (PCT)
Prior art keywords
electro
graphene
infrared
electrically conductive
thin film
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/TR2014/000230
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English (en)
Inventor
Cemile Duygu OZTURK SELCUK
Basak YAZGAN SENEL
Mustafa Burak COSAR
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aselsan Elektronik Sanayi ve Ticaret AS
Original Assignee
Aselsan Elektronik Sanayi ve Ticaret AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aselsan Elektronik Sanayi ve Ticaret AS filed Critical Aselsan Elektronik Sanayi ve Ticaret AS
Priority to PCT/TR2014/000230 priority Critical patent/WO2015199624A1/fr
Publication of WO2015199624A1 publication Critical patent/WO2015199624A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/11—Anti-reflection coatings
    • G02B1/113—Anti-reflection coatings using inorganic layer materials only
    • G02B1/115—Multilayers
    • G02B1/116—Multilayers including electrically conducting layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/04—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of carbon-silicon compounds, carbon or silicon
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B2207/00—Coding scheme for general features or characteristics of optical elements and systems of subclass G02B, but not including elements and systems which would be classified in G02B6/00 and subgroups
    • G02B2207/109—Sols, gels, sol-gel materials
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B2207/00—Coding scheme for general features or characteristics of optical elements and systems of subclass G02B, but not including elements and systems which would be classified in G02B6/00 and subgroups
    • G02B2207/121—Antistatic or EM shielding layer

Definitions

  • This invention relates to making windows having an infrared transparent substrate. More particularly it relates to infrared transmitting windows with an electrically conductive, infrared transparent continuous thin film coating for electromagnetic interference shielding in electro-optical systems. The invention further relates to making such infrared transparent windows which are not only protected from electromagnetic interference shielding but also from hostile environmental conditions.
  • Electro-optical systems used for surveillance are made up of a number of different parts contained within a housing. Apart from the optical assembly, typically an electro-optical system is composed of parts such as sensors, electronic systems which control the sensors, analyze and interpret signals received by sensors. Such an electro-optical system receives signals from the target through its external window.
  • the window not only must the window possess sufficient physical strength to withstand rapidly changing pressure and temperature differentials, the external surface of the window must withstand abrasion by rain, air and dust. Furthermore, unwanted electro-magnetic radiation may also enter through this window beside the signals from the target. If this is a radar or radio frequency then it may interfere with the electronic components of the system in a negative way. For this reason, in military applications, the window must also provide a shield against longer wavelength electromagnetic radiation such as radar and radio.
  • compositions of zinc selenide, zinc sulfide for example are commonly used as window materials for applications requiring transparency from near to long wave infrared (800- 12000 nm) range of the spectrum.
  • Other materials such as aluminum oxynitride, spinel, sapphire, yttria make good window materials for wavelength within the near- to mid- infrared range.
  • silicone makes a good substrate and germanium is the choice for mid (3000- 5000 nm) - and long (8000-12000 nm) applications
  • shielding as applied to electromagnetic radiation can be defined as the reduction of the amount of EM radiation originating from a specific point in space.
  • the shielding medium needs to be conductive promoting the utilization of metals for EM interference (EMI) shielding purposes.
  • Electromagnetic interference (EMI) shielding of windows and domes in electro— -optical (EO) systems can be accomplished by several different ways. Among the common approaches is applying a transparent electrically conductive coating. For systems operating in the visible spectrum of light, glass and/or polymer windows coated with ⁇ are widely used. ITO coatings have high transparency from 0,40um up to l,06um.
  • the application process includes steps like mesh structure design, lithography, ion etching and vapor evaporation. All these steps are time consuming and result in increased costs.
  • Infrared EO systems often use windows or domes made of semiconductive material. These semiconductive materials also provide some EMI shielding for the system. The shielding efficiency of these systems can further be increased by increasing the conductivity of these semiconductor materials by increasing their doping content.
  • infrared transparent conductive diffused layers have been integrated into germanium windows using an ion— implantation/diffusion technique. These layers are nominally 25 microns thick with sheet resistance of 5-10 ohms/square.
  • the increase in the number of dopant atoms within the semiconducting crystal results in a decrease in the transparency up to %5 due to scattering and introduction of possible color centers. It is possible to optimize the doping density so that a good conductivity allowing for the required EMI shielding and high transmission of light is obtained.
  • the main restriction of this method is that it can only be applied to semiconducting crystal lenses.
  • a transparent conductive article includes a transparent substrate, a thin electrically conductive grid and a carbon nanolayer.
  • the carbon nanolayer has a morphology that includes graphite platelets embedded in nano-crystalline carbon.
  • the said article have a visible light transmission of at least 80% and a sheet resistance less than 500 or 100 ohm/square.
  • the transparent substrate may comprise a flexible polymer film.
  • the general object of present invention to provide an electro-optical window having and electrically conductive continuous thin film coating substantially transparent to at least one of the near-infrared, mid-wave infrared and long-wave infrared radiation.
  • near-, mid-wave and long-wave infrared radiations being the 800-2000 nm, 3000-5000 nm and 8000-12000 nm wavelength ranges, respectively.
  • a yet further object of the present invention is to provide an electro-optical window with high resistance to environmental damage.
  • the electro-optical window of the present invention comprises of a substrate material [11] transparent to at least one of the near-infrared, mid-wave infrared and long-wave infrared radiation.
  • the substrates of the said electro-optical windows of the invention can be selected from a range of materials including zinc selenide, zinc sulfide, magnesium fluoride, calcium fluoride, sapphire, aluminum oxynitride, spinel, yttria, germanium, silicon depending on the desired wavelengths. Further the substrates may be manufactured in the form of a window, dome or a lens.
  • This window is forming a conducting first layer [12] on top of which lies a second multi-layered coating protecting the whole structure from environmental damage.
  • This coating also serves as an antireflection (AR) coating providing a high transparency through the electro-optical window.
  • Multi-layered AR coatings are composed of high and low refractive index alternating layers.
  • Low refractive index layers of the AR coating can be selected from a range of materials including Si0 2 , YbF 3 , MgF 2 , Y 2 0 3 , Sc 2 0 3 , Lu 2 0 3 , A1 2 0 3 , ZnSe, Zns and high refractive index layers of the AR coating can be selected from Ta 2 0 5 , Ti0 2 , Zr0 2 , Si, Ge, Nb0 2 , Hf0 2 , Zr0 2 , ZnO, ZnS, ZnSe, Ge and Si.
  • Figure 1 shows An EMI shielding AR coated lens/window/dome
  • Figure 2 shows transmission spectra for NIR-MWIR dual band EMI shielding lens/window/dome
  • Figure 3 shows transmission spectra for NIR-MWIR Tri-Band EMI shielding lens/window/dome
  • FIG. 4 shows transmission spectra for MWIR-LWIR Dual Band EMI shielding lens/window/dome Detailed Description of the Invention
  • an electro-optical window comprises of a substrate material [11] transparent to at least one of the near- infrared, mid-wave infrared and long-wave infrared radiation forms a base for an electrically conductive continuous thin film coating [12] made up of graphene is protected against environmental conditions through a multi layered anti-reflection coating [13].
  • Both graphene based electrically conductive continuous thin film and anti- reflection coating are also at least 90% transparent to at least one of the near- infrared, mid-wave infrared and long-wave infrared radiation.
  • the structure is designed such that transparency is increased while maintaining a good EMI shielding and environmental protection.
  • Electro-optic windows can be fabricated in different ways depending on the material of choice. Common polycrystalline windows such as zinc selenide and zinc sulfide are fabricated by means of chemical vapor deposition. Other polycrystalline materials such as spinel, aluminum oxynitride and yttria are manufactured by means of ceramic processing techniques such as hot pressing, hot isostatic pressing or sintering. Single crystal optical windows such as sapphire, germanium, silicone, calcium fluoride and magnesium fluoride on the other hand, are grown from the melt.
  • the substrate [11] material utilized in this invention shall be transparent to at least one of the near-infrared, mid-wave infrared and long-wave infrared spectrum of light.
  • the substrate of the window of the invention is made of a material selected from zinc selenide, zinc sulfide, magnesium fluoride, calcium fluoride, sapphire, aluminum oxynitride, spinel, yttria, germanium, silicon.
  • the electrically conductive, infrared transparent continuous thin film coating [12], made up of graphene, is capable of dampening the amplitude of the interfering electro-magnetic radiation may be fabricated by several different approaches.
  • the electrically conductive, infrared transparent continuous thin film coating of the present invention is comprised of a single or multi-layer graphene film manufactured by means of a technique selected from chemical vapor deposition (CVD), plasma-enhanced chemical vapor deposition (PECVD) and molecular beam epitaxy (MBE) techniques.
  • CVD chemical vapor deposition
  • PECVD plasma-enhanced chemical vapor deposition
  • MBE molecular beam epitaxy
  • electrically conductive, infrared transparent continuous thin film coating is formed dispersing graphene in a metal-oxide solution prepared by means of sol-gel processes.
  • a graphene based composite can be prepared by different chemical routes for different metal-oxide matrix materials used.
  • This graphene/metal-oxide sol mixture forms a composite layer and applied on the substrate window by means of spin coating, spray coating dipping techniques.
  • the thickness and the conductance of the graphene containing conducting layer to act as an EMI shield is determined from the strength and frequency spectrum of the electromagnetic field and the tolerance of the device or components which is to be shielded.
  • An AR layer [13] to enhance the light gathering capacity of the window shall be applied on the conducting layer [12].
  • the said layer shall also be responsible for protecting the underlying layers from the effects of environment due to the fact that it is the outer most layers on window.
  • the AR coating comprises alternating low and high index layers for the desired protection and transparency.
  • the layers of the low refractive index can be selected from a range of materials including Si0 2 , YbF 3 , MgF 2 , Y 2 0 3 , Sc 2 0 3 , Lu 2 0 3 , A1 2 0 3 , ZnSe, Zns.
  • high refractive index layers of the AR coating can be selected from Ta 2 C>5, Ti0 2 , Zr0 2 , Si, Ge, Nb0 2 , Hf0 2 , Zr0 2 , ZnO, ZnS, ZnSe, Ge and Si.
  • CVD chemical vapor deposition
  • PECVD plasma-enhanced chemical vapor deposition
  • PVD physical vapor deposition
  • PEPVD plasma echaced physical deposition
  • ALD atomic layer deposition
  • the window comprising the said substrate [11], the said conducting layer [12] and the said AR layer [13] shall be capable of transmitting at least 90% of the incoming IR light onto the system.
  • the optical EMI shielding system shall be constructed to work with either single, dual or tri-band applications.
  • Typical transmission curves for dual and tri-band applications are shown in Figures 2 through 4.
  • Figure 2 is a transmission curve for window that can be used in the NIR (800-2000 nm ) and MWIR (3000 - 5000 nm) dual band applications
  • Figure 3 is a typical example for tri-band applications
  • Figure 4 shows the curve for a dual band application in the MWIR and LWIR (8000-12000 nm) range.
  • Optical EMI shielding system shall, also, be able to cope with the environmental conditions forced upon the system by the platform on which the electro-optical system to be used.
  • optical EMI shielding system shall be subjected to MIL-C-675 and/or MIL-M- 13508 (whichever is applicable) for adherence, humidity, abrasion and salt spray tests.

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

La présente invention porte sur un revêtement à base de graphène que l'on a fait croître sur un dôme/fenêtre/lentille externe d'un système électro-optique de façon à améliorer le facteur de transmission de lumière ayant une longueur d'onde dans le spectre du proche infrarouge et de l'infrarouge de longueur d'onde moyenne tout en éliminant un rayonnement électromagnétique dans la plage entre 100 MHz et 20 GHz. Une lentille/fenêtre externe ou un dôme de blindage contre les interférences électromagnétiques pour un système électro-optique fonctionnant dans la région du proche infrarouge et/ou de l'infrarouge de longueur d'onde moyenne comprend deux couches de revêtement fonctionnalisées de façon différente. La première couche, jouant le rôle de couche métallique de blindage contre les interférences électromagnétiques, est constituée par du graphène en tant que la couche elle-même ou en tant qu'une charge dans la matrice d'oxyde métallique. Ladite couche, ayant une faible résistivité, est responsable de l'élimination du rayonnement électromagnétique provenant de modules électroniques environnants. La seconde couche, par ailleurs, est destinée à deux buts. Le premier est d'accroître la transmission de la lumière, et le second est de protéger le graphène sous la couche vis-à-vis d'une usure environnementale.
PCT/TR2014/000230 2014-06-23 2014-06-23 Revêtement optique de blindage contre les interférences électromagnétiques à base de graphène Ceased WO2015199624A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/TR2014/000230 WO2015199624A1 (fr) 2014-06-23 2014-06-23 Revêtement optique de blindage contre les interférences électromagnétiques à base de graphène

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/TR2014/000230 WO2015199624A1 (fr) 2014-06-23 2014-06-23 Revêtement optique de blindage contre les interférences électromagnétiques à base de graphène

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018174351A1 (fr) * 2017-03-24 2018-09-27 서울대학교산학협력단 Lentille de contact fonctionnelle et procédé pour sa fabrication
FR3066645A1 (fr) * 2017-05-22 2018-11-23 Safran Electronics & Defense Ensemble de blindage electromagnetique transparent optiquement
JP2019036732A (ja) * 2017-08-18 2019-03-07 グッドリッチ コーポレイション Ｍｗｉｒ／ｌｗｉｒ透明伝導性コーティング
WO2021062162A1 (fr) * 2019-09-26 2021-04-01 Raytheon Company Procédé de protection des fenêtres et des dômes de transmission ir contre les interférences électromagnétiques
CN114501969A (zh) * 2022-01-29 2022-05-13 哈尔滨工业大学 一种基于热致相变材料的高透光热可调微波吸收光窗
US20220244431A1 (en) * 2021-02-01 2022-08-04 Raytheon Company Swir-mwir transparent, conductive coating for emi protection of ncoc
CN115171956A (zh) * 2022-06-30 2022-10-11 安徽工程大学 一种红外透明导电碳基薄膜及其制备方法
CN118765106A (zh) * 2024-09-09 2024-10-11 北京航空航天大学 一种飞机光电吊舱用隐身屏蔽片及其制造方法
US12185515B2 (en) 2021-12-16 2024-12-31 AISIN Technical Center of America, Inc. Polymer-graphene electronic component housing
US12414279B2 (en) 2022-04-26 2025-09-09 Raytheon Company Optical window with embedded screen

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2541559A1 (fr) * 2011-06-30 2013-01-02 Rohm and Haas Electronic Materials LLC Transducteur capacitatif à action directe
GB2508226A (en) * 2012-11-26 2014-05-28 Selex Es Ltd Graphene housing for a camera

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2541559A1 (fr) * 2011-06-30 2013-01-02 Rohm and Haas Electronic Materials LLC Transducteur capacitatif à action directe
GB2508226A (en) * 2012-11-26 2014-05-28 Selex Es Ltd Graphene housing for a camera

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018174351A1 (fr) * 2017-03-24 2018-09-27 서울대학교산학협력단 Lentille de contact fonctionnelle et procédé pour sa fabrication
US11927835B2 (en) 2017-03-24 2024-03-12 Seoul National University R&Db Foundation Functional contact lens and manufacturing method therefor
CN111512130A (zh) * 2017-05-22 2020-08-07 赛峰电子与防务公司 光学透明的电磁屏蔽组件
CN111512130B (zh) * 2017-05-22 2021-07-27 赛峰电子与防务公司 光学透明的电磁屏蔽组件
JP2020521136A (ja) * 2017-05-22 2020-07-16 サフラン・エレクトロニクス・アンド・デファンス 光学的に透過性である電磁遮蔽組立体
WO2018215243A1 (fr) * 2017-05-22 2018-11-29 Safran Electronics & Defense Ensemble de blindage electromagnetique transparent optiquement
FR3066645A1 (fr) * 2017-05-22 2018-11-23 Safran Electronics & Defense Ensemble de blindage electromagnetique transparent optiquement
US11060920B2 (en) 2017-05-22 2021-07-13 Safran Electronics & Defense Optically transparent electromagnetic shield assembly
JP7226939B2 (ja) 2017-08-18 2023-02-21 グッドリッチ コーポレイション Ｍｗｉｒ／ｌｗｉｒ透明伝導性コーティング
JP2019036732A (ja) * 2017-08-18 2019-03-07 グッドリッチ コーポレイション Ｍｗｉｒ／ｌｗｉｒ透明伝導性コーティング
WO2021062162A1 (fr) * 2019-09-26 2021-04-01 Raytheon Company Procédé de protection des fenêtres et des dômes de transmission ir contre les interférences électromagnétiques
JP2022549855A (ja) * 2019-09-26 2022-11-29 レイセオン カンパニー Ｉｒ伝送窓およびドームをｅｍｉから保護する方法
JP7534056B2 (ja) 2019-09-26 2024-08-14 レイセオン カンパニー Ｉｒ伝送窓およびドームをｅｍｉから保護する方法
US12414278B2 (en) 2019-09-26 2025-09-09 Raytheon Company Method for protecting IR transmitting windows and domes from EMI
US20220244431A1 (en) * 2021-02-01 2022-08-04 Raytheon Company Swir-mwir transparent, conductive coating for emi protection of ncoc
KR20230133913A (ko) * 2021-02-01 2023-09-19 레이던 컴퍼니 Ncoc의 emi 보호를 위한 swir-mwir 투명성, 전도성 코팅막
US12248122B2 (en) * 2021-02-01 2025-03-11 Raytheon Company SWIR-MWIR transparent, conductive coating for EMI protection of NCOC
KR102891134B1 (ko) * 2021-02-01 2025-11-27 레이던 컴퍼니 Ncoc의 emi 보호를 위한 swir-mwir 투명성, 전도성 코팅막
US12185515B2 (en) 2021-12-16 2024-12-31 AISIN Technical Center of America, Inc. Polymer-graphene electronic component housing
CN114501969A (zh) * 2022-01-29 2022-05-13 哈尔滨工业大学 一种基于热致相变材料的高透光热可调微波吸收光窗
US12414279B2 (en) 2022-04-26 2025-09-09 Raytheon Company Optical window with embedded screen
CN115171956A (zh) * 2022-06-30 2022-10-11 安徽工程大学 一种红外透明导电碳基薄膜及其制备方法
CN118765106A (zh) * 2024-09-09 2024-10-11 北京航空航天大学 一种飞机光电吊舱用隐身屏蔽片及其制造方法

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