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提出了一种可同时达到高对比度和高反射率的对称金属包覆结构。由于导波层的厚度是亚毫米量级,使该结构可容纳一系列共振模。利用四层波导菲涅耳公式,详细分析了耦合金属层的厚度对耦合效率的影响,给出了反射光达到最大对比度时耦合金属层厚度的最优值,并从物理的角度解释了这种现象产生的原因是对称金属包覆结构中的辐射损耗和本征损耗共同作用的结果。实验测量了对称金属包覆结构中反射光的干涉效应。结果表明,对称金属包覆结构可以大大增强反射光的干涉条纹中明、暗光线的对比度,同时光入射到对称金属包覆结构中的耦合效率可接近100%。这将有助于研究高对比度高反射率薄膜和基于对称金属包覆结构的传感器。
A symmetrical metal clad structure that achieves high contrast and high reflectivity simultaneously is proposed. Since the thickness of the waveguide layer is on the submillimeter scale, the structure accommodates a series of resonant modes. The effect of the thickness of the coupling metal layer on the coupling efficiency is analyzed in detail by using the four-layer waveguide Fresnel formula, and the optimal value of the coupling metal layer thickness when the reflected light reaches the maximum contrast is given. The physical thickness of the coupled metal layer is also explained The reason for this phenomenon is the result of the synergistic effect of the radiation loss and the intrinsic loss in the symmetrical metal-clad structure. The interference effect of the reflected light in the symmetrical metal cladding was measured experimentally. The results show that the symmetric metal cladding structure can greatly enhance the contrast of light and dark in the interference fringes of the reflected light, and the coupling efficiency of light incident on the symmetrical metal cladding can be close to 100%. This will help to study high-contrast, high-reflectance films and sensors based on symmetrical metal-clad structures.