Enhancing optical transparency of photonic crystals for high-performance electromagnetic interference shielding

IF 3.7 2区工程技术 Q2 OPTICS

Optics and Lasers in Engineering Pub Date : 2025-08-28 DOI:10.1016/j.optlaseng.2025.109293

Heyan Wang , Nuo Xu , Jianghai He , Dongzhen Wang , Zhengang Lu , Yilei Zhang , Jiubin Tan

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Abstract

In recent years, electromagnetic interference has caused serious threats to both electronic systems and human health. Transparent electromagnetic shielding technology has become a crucial research area for achieving shielding while ensuring optical transparency. This study investigated one-dimensional metal/dielectric photonic crystals on microwave shielding and light transmission. We first found that shielding capability depends primarily on total metal thickness in photonic crystals, rather than its distribution. Particularly, by subdividing the metal into multiple periods with a constant thickness, substantial enhancement in visible transmittance can be achieved while preserving equivalent shielding performance. Accordingly, a high-quality ultra-thin doped silver (8 nm) was employed to construct photonic crystals verifying the assumption. Experiments show that, at a silver film thickness of 24 nm, subdividing into three periods relatively increases the average transmittance by 70.1% (theoretically more than 100%) over the single-layer metal film. Meanwhile, the shielding effectiveness remains consistent for all configurations, with each measurement exceeding -32 dB. In addition, we have established the multi-beam interference-based model to analyze the transmission of microwaves and visible light in photonic crystals. The results are expected to guide refining the optical properties of metal shielding films and exploring the limits of light transmission achievable in experiments for photonic crystals.

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提高光子晶体的光学透明度，用于高性能电磁干扰屏蔽

近年来，电磁干扰对电子系统和人体健康都造成了严重的威胁。透明电磁屏蔽技术已成为在保证光透明性的同时实现屏蔽的重要研究领域。本文研究了一维金属/介电光子晶体对微波屏蔽和光传输的影响。我们首先发现，屏蔽能力主要取决于光子晶体中的金属总厚度，而不是其分布。特别是，通过将金属细分为具有恒定厚度的多个周期，可以在保持等效屏蔽性能的同时大幅提高可见光透过率。因此，采用高质量的超薄掺杂银（8 nm）构建光子晶体来验证这一假设。实验表明，在银膜厚度为24 nm时，将其细分为三个周期相对于单层金属膜提高了70.1%的平均透过率（理论上大于100%）。同时，所有配置的屏蔽效果保持一致，每次测量都超过-32 dB。此外，我们还建立了基于多光束干涉的模型来分析微波和可见光在光子晶体中的传输。研究结果有望指导改进金属屏蔽膜的光学性能，并探索光子晶体实验中可实现的光透射极限。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optics and Lasers in Engineering 工程技术-光学

CiteScore

8.90

自引率

8.70%

发文量

384

审稿时长

42 days

期刊介绍： Optics and Lasers in Engineering aims at providing an international forum for the interchange of information on the development of optical techniques and laser technology in engineering. Emphasis is placed on contributions targeted at the practical use of methods and devices, the development and enhancement of solutions and new theoretical concepts for experimental methods. Optics and Lasers in Engineering reflects the main areas in which optical methods are being used and developed for an engineering environment. Manuscripts should offer clear evidence of novelty and significance. Papers focusing on parameter optimization or computational issues are not suitable. Similarly, papers focussed on an application rather than the optical method fall outside the journal''s scope. The scope of the journal is defined to include the following: -Optical Metrology- Optical Methods for 3D visualization and virtual engineering- Optical Techniques for Microsystems- Imaging, Microscopy and Adaptive Optics- Computational Imaging- Laser methods in manufacturing- Integrated optical and photonic sensors- Optics and Photonics in Life Science- Hyperspectral and spectroscopic methods- Infrared and Terahertz techniques