Bayesian optimization of nanophotonic electromagnetic shielding with very high visible transparency
Bayesian optimization of nanophotonic electromagnetic shielding with very high visible transparency
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DOI：
10.1364/oe.468843
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发表时间：
2022-08-29
期刊：
影响因子：
3.8
通讯作者：
Leu, Paul W.
中科院分区：
文献类型：
--
作者：
Li, Mingxuan;McCourt, Michael J.;Leu, Paul W.
许多光电应用都需要透明电磁干扰 (EMI) 屏蔽，以保护电子设备免受周围辐射的影响，同时实现高可见光传输。然而，文献中尚未实现非常高的传输率（超过92.5％）、高EMI屏蔽效率（超过30dB）的结构。贝叶斯优化用于优化不同的纳米光子结构，以获得高 EMI 屏蔽效率 (SE) 和高可见光透射率 ((T) over bar (vis))。当平均可见光透射率低于 90% 时，由高折射率电介质/银/高折射率电介质薄膜组成的夹层结构被认为是最佳的，它们能够实现 43.1 dB SE 和 90.0% (T) over bar (vis)。高折射率介电层减少了银的吸收损耗，并且可以设计为通过相消干涉来提供抗反射。然而，为了实现 (T) 超过棒 (vis) 90% 以上的最佳 EMI 屏蔽，需要进一步降低空气/电介质界面处的反射损耗。优化的双面纳米锥夹层结构被确定为最佳结构，可实现 41.2 dB SE 和 90.8% (T) over bar (vis) vis 以及 35.6 dB SE 和 95.1% (T) over bar (vis)。 K 均值聚类用于显示特征近帕累托最优结构的性能。双面纳米锥结构显示出全向可见光透射率，SE = 35.6 dB，并且在 70 度的入射角下，超过条形图 (vis) 的透射率 (T) 超过 85%。 (C) 2022 Optica Publishing Group 根据 Optica 开放获取出版协议的条款
Transparent electromagnetic interference (EMI) shielding is needed in many opto-electronic applications to protect electronic devices from surrounding radiation while allowing for high visible light transmission. However, very high transmission (over 92.5%), high EMI shielding efficiency (over 30 dB) structures have yet to be achieved in the literature. Bayesian optimization is used to optimize different nanophotonic structures for high EMI shielding efficiency (SE) and high visible light transmission ((T) over bar (vis)). Below 90% average visible light transmission, sandwich structures consisting of high index dielectric/silver/high index dielectric films are determined to be optimal, where they are able to achieve 43.1 dB SE and 90.0% (T) over bar (vis). The high index of refraction dielectric layers reduce absorption losses in the silver and can be engineered to provide for antireflection through destructive interference. However, for optimal EMI shielding with (T) over bar (vis) above 90%, the reflection losses at the air/dielectric interfaces need to be further reduced. Optimized double sided nanocone sandwich structures are determined to be best where they can achieve 41.2 dB SE and 90.8% (T) over bar (vis) vis as well as 35.6 dB SE and 95.1% (T) over bar (vis). K-means clustering is utilized to show the performance of characteristic near-Pareto optimal structures. Double sided nanocone structures are shown to exhibit omnidirectional visible transmission with SE = 35.6 dB and over 85% (T) over bar (vis) at incidence angles of 70 degrees. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement