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Fabrication and transmission properties of two-dimensional concavity metal/dielectric multilayer structure

机译:二维凹面金属/介电多层结构的制备与传输性能

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Large-scale two-dimensional concavity metal/dielectric multilayer structure with submicrometer periodicity was fabricated by self-assembly of colloidal crystal, PDMS molding, and multilayer deposition into the PDMS cavity array, and its transmission properties were experimentally measured as the number of metal layer. For the samples with one metal layer, two transmission pass bands have been observed in the sample due to the excitation of surface plasmon polaritons (SPPs). The peak positions of the pass bands depend on the periodicity of the colloidal crystal. The transmission spectra highly depend on the incident angle for both s- and p-polarized light. For the samples with two or more metal layers, a new pass band due to interference appears. This band is not as sensitive to the incident angle for s- or p-polarized light as the SPP induced band is, and its position depends on the thickness of the metal and dielectric layer. As the number of metal layer increases, the intensity of the SPPs induced band decreases faster than that of the interference related band. For the samples with four metal layers, only the interference related band is clearly observed. The fabrication method introduced here also provides a low-cost approach to the fabrication of 2D cavity metal/dielectric multilayer structure, and the method would be useful in the hyperlens array fabrication.
机译:通过自组装胶体晶体,PDMS成型,多层沉积到PDMS腔阵列中,制造出具有亚微米周期性的大型二维凹面金属/介电多层结构,并通过金属层数实验测量了其透射特性。对于具有一个金属层的样品,由于表面等离激元极化子(SPPs)的激发,在样品中观察到了两个透射通带。通带的峰值位置取决于胶体晶体的周期性。透射光谱高度取决于s偏振和p偏振光的入射角。对于具有两个或多个金属层的样品,由于干扰而出现新的通带。该带对SP或P偏振光的入射角不如SPP感应带敏感,其位置取决于金属和介电层的厚度。随着金属层数量的增加,SPP感应带的强度下降的速度快于干扰相关带的强度。对于具有四个金属层的样品,仅清楚观察到与干扰有关的谱带。这里介绍的制造方法还为二维腔金属/介电多层结构的制造提供了一种低成本的方法,该方法将在超透镜阵列的制造中有用。

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