金属光子晶体结构对其透光率强度和曲线宽度的影响  

Effect of Metal Photonic Crystal Structure on Its Transmittance Intensity and Width

作　　者：赵亚丽 贾琨[2] 赵岩 马玉峰[2] 李旭峰[3] ZHAO Yali;JIA Kun;ZHAO Yan;MA Yufeng;LI Xufeng(School of Mathmatics and Phsics,Jinzhong University,Yuci 030606,China;No.33 Research Institute of China Electronics Technology Group Corporation,Taiyuan 030006,China;School of Applied Science,Taiyuan University of Science and Technology,Taiyuan 030024,China)

机构地区：[1]晋中学院数理学院,榆次030606 [2]中国电子科技集团公司第三十三研究所,太原030006 [3]太原科技大学应用科学学院,太原030024

出　　处：《材料导报》2021年第14期14171-14175,共5页Materials Reports

基　　金：山西省高等学校科技创新项目(2020L0575,2020L0594);晋中学院博士基金启动项目(jzxybsjjxm2019039,jzxybsjjxm2019021);晋中市科技重点研发项目(Y201027)。

摘　　要：将金属光子晶体(Metal photonic crystals,MPCs)应用于电子设备的可视部位,有望实现可视和电磁屏蔽的兼容。如何在不降低金属膜厚比的前提下,同时提高和拓宽MPCs的可见光透光率强度和宽度是目前需解决的关键问题。鉴于此,本工作构建了由金属Ag和In_(2)O_(3)∶SnO_(2)(ITO)膜呈周期分布的MPCs,采用时域有限元差分法(Finite difference time domain,FDTD)和Bragg衍射定律分别研究了其周期对其透光率影响规律和物理机制。研究结果表明,高透光的MPCs周期(即相邻的ITO和Ag膜厚之和)需大于58 nm。同时,通过FDTD对MPCs的SPP(Surface plasmon polariton)能带计算,发现ITO膜为40 nm时,SPP较弱,致使可见光透光率较低。随金属膜厚比降低,SPP色散能带相应变宽,可见光透光率曲线相应变宽。本工作提出一种(pqp)^(N)型MPCs,采用该结构可同时提高MPCs的可见光透光率强度和拓宽其宽度。Metal photonic crystals(MPCs)could potentially be used in the visible part of electronic devices,which is expected to achieve the compatibility of visible and electromagnetic shielding.The fundamental challenge for its application is achieving the ideal combination of both high and broad band transmittance without decreasing the metal film thickness ratio.In this paper,finite difference time difference domain(FDTD)and Bragg diffraction law were used to investigate the influence of MPCs period on transmittance.The results suggested that the period greater than 58 nm is essential for high optical transmittance.When the thickness of each layer ITO is 40 nm,optical transmittance of MPCs is lower due to lower energy of surface plasmon polariton(SPP).With decreasing of the metal film thickness ratio,the energy band of SPP widen accordingly.Accordingly,the optical transmittance line also widen.In this paper,the MPCs is proposed with type of(pqp)^(N),both the intensity and width of optical transmittance line are improved by adopting it.

关 键 词：金属光子晶体 膜表面等离子激元 可见光透光率 透光率强度 

分 类 号：TQ594[化学工程—精细化工] TQ171.7