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传统金属网栅多为二维方格结构, 光学透射率损耗较大, 高级次衍射杂散光严重干扰探测系统成像质量. 本文设计了一种具有随机六元环表面结构的金属网络导电薄膜, 该结构相较于传统二维方格结构金属网栅具有更高的光学透射率; 由于在结构中引入了随机变量, 也可以实现高级次衍射杂散光的抑制. 随后在ZnS光学窗口上完成了线宽为4 μm、周期为100 μm的随机六元环结构金属网络导电膜的制备. 测试结果表明, 样品表面图案完整、金属线清晰可见、线宽均匀、无断线情况发生. ZnS光学窗口在长波红外波段透射率损失10.5%, 在可见光波段透射率仅损失6.8%, 同时可以显著均化高级次衍射杂散光分布. 电磁屏蔽数值仿真结果显示, 该网络导电膜在0.2—20 GHz电磁波谱段内平均电磁屏蔽效能为37.9 dB, 最低屏蔽效能29.6 dB, 比传统方格结构网栅高3.2 dB. 本文设计并制备的随机六元环结构金属网络导电膜具有优异的光学性能与电磁屏蔽效能, 对于提升图形化光学窗口的综合性能具有重大意义.Traditional metallic meshes are a two-dimensional square structure with high optical transmittance loss, and the diffraction of light seriously interferes with the imaging quality of the detection system. In this work a metallic network conductive film with a random hexagonal surface structure is designed. This structure has a higher optical transmittance than conventional square metallic meshes. As a result of the random variables in the structure, it can also suppress the stray light of high-order diffraction. Then we prepare a metallic network conductive film on a ZnS optical window with a line width of 4 μm and a period of 100 μm. The metal lines of the sample are clear, the line width is uniform, and there is no dotted line. The transmission loss of the ZnS optical window is 10.5% in the long-wave infrared band (LWIR) band but only 6.8% in the visible band, which has low energy loss. At the same time, it can achieve uniform optical diffraction, thus reducing the imaging interference to the photoelectric detection system. The numerical simulation results show that the average EMI shielding efficiency is 37.9db, which is in an electromagnetic spectrum range from 0.2 GHz to 20 GHz, and its minimum shielding efficiency is 29.6 dB, which is 3.2 dB higher than the traditional square mesh’s. The random hexagonal structure metallic network conductive films designed and prepared in this paper have excellent optical properties and EMI shielding efficiencies, which is of great significance in improving the comprehensive performance of the graphical optical window.
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Keywords:
- optical window /
- metallic network conductive film /
- electromagnetic interference shielding /
- high-order diffraction
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图 2 规则六边形结构与随机六元环结构构效关系 (a) 规则六边形结构; (b) 随机六元环结构; (c) 随机结构生成原理
Fig. 2. Conformational relationship: (a) Regular hexagonal structure; (b) random hexagonal structure; (c) random structure generation principle.
图 3 金属网栅的不同表面结构所对应的衍射能量分布 (a)二维方格结构; (b)规则六边形结构; (c)随机六元环结构
Fig. 3. Distribution of diffracted intensity under different surface structures: (a) Two dimensional (2D) square structure; (b) regular hexagonal structure; (c) random hexagonal structure.
图 4 二维方格结构、规则六边形结构与随机六元环结构三者电磁屏蔽效能对比
Fig. 4. Comparison of electromagnetic interference shielding effectiveness among 2D square structure, regular hexagonal structure and random hexagonal structure.
图 5 金属网络导电膜微观结构 (a) 100 X金相显微探测结果; (b) 200 X金相显微探测结果
Fig. 5. Random hexagonal surface microstructure: (a) 100 X metallographic probing result; (b) 200 X metallographic probing results.
图 6 透射率测试结果 (a) 400—800 nm可见光波段透射率; (b) 8—12 μm长波红外波段透射率
Fig. 6. Transmittance test results: (a) Transmittance in the 400–800 nm visible band; (b) transmittance in the 8–12 μm long-wave infrared band.
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[1] Han J C, Wang X N, Qiu Y F, Zhu J Q, Hu P A 2015 Carbon 87 206
Google Scholar
[2] Xu H, Anlage S M, Hu L B, Gruner G 2007 Appl. Phys. Lett. 90 183119
Google Scholar
[3] Mesfin H M, Baudouin A C, Hermans S, Delcorte A, Huynen I, Bailly C 2014 Appl. Phys. Lett. 105 103105
Google Scholar
[4] Polley D, Barman A, Mitra R K 2014 Opt. Lett. 39 1541
Google Scholar
[5] Hu M J, Gao J F, Dong Y C, Li K, Shan G C, Yang S L, Li R K 2012 Langmuir 28 7101
Google Scholar
[6] Huang J L, Yau B S, Chen C Y, Lo W T, Lii D F 2001 Ceram. Int. 27 363
Google Scholar
[7] Kim C H, Lee Y 2011 Int. J. Precis. Eng. Manuf. 12 161
Google Scholar
[8] Han Y, Liu Y X, Han L, Lin J, Jin P 2017 Carbon 115 34
Google Scholar
[9] Tan J B, Lu Z G 2007 Opt. Express 15 790
Google Scholar
[10] Lu Z G, Liu Y S, Wang H Y, Tan J B 2016 Appl. Opt. 55 5372
Google Scholar
[11] Kohin M, Wein S J, Traylor J D, Chase R C, Chapman J E 1993 Opt. Eng. 32 911
Google Scholar
[12] Jiang Z Y, Huang W B, Chen L S, Liu Y H 2019 Opt. Express 27 24194
Google Scholar
[13] Zhong H, Han Y, Lin J, Jin P 2020 Opt. Express 28 7008
Google Scholar
[14] 梁圆龙, 黄贤俊, 姚理想, 程开, 刘培国 2021 安全与电磁兼容 2 61
Google Scholar
Liang Y L, Huang X J, Yao L X, Cheng K, Liu P G 2021 Safety & EMC 2 61
Google Scholar
[15] Halman J I, Ramsey K A, Thomas M, Griffin A 2009 Proceedings of SPIE - The International Society for Optical Engineering Orlando, USA, April 15-16, 2009 p73020 Y
[16] Wang W Q, Bai B F, Zhou Q, Ni K, Lin H 2018 Opt. Mater. Express 8 3485
Google Scholar
[17] Han Y, Lin J, Liu Y X, Fu H, Ma Y, Jin P, Tan J B 2016 Sci. Rep. 6 25601
Google Scholar
[18] Ulrich R 1967 Infrared Phys. 7 37
Google Scholar
[19] 冯晓国, 张舸, 汤洋 2015 光学精密工程 23 686
Google Scholar
Feng X G, Zhang G, Tang Y 2015 Opt. Precis. Eng. 23 686
Google Scholar
[20] Jiang Z Y, Zhao S Q, Chen L S, Liu Y H 2021 Opt. Express 29 18760
Google Scholar
[21] 庄松林, 钱振邦 1981 光学传递函数(北京: 机械工业出版社) 第264页
Zhuang S L, Qian Z B 1981 Optical Transfer Function (Beijing: China Machine Press) p264 (in Chinese)
[22] 陆振刚 2007 博士学位论文 (哈尔滨: 哈尔滨工业大学)
Lu Z G 2007 Ph. D. Dissertation (Harbin: Harbin Institute of Technology) (in Chinese)
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