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微区光谱在表面等离激元光电探测器中的应用

基于金属表面等离激元（SPP）的新型光电探测器件是诸多学者研究的热点领域之一。表征纳米器件共振波长/共振吸收的微区光谱是微型光电探测器件研究中必不可少的检测手段。

【概述】表面等离激元（surface plasmon polariton, SPP）是由外部电磁场与金属表面自由电子相互作用而形成的一种相干共振现象。基于金属表面等离激元，将入射光子转化成电子而制备的新型光电探测器件，具有体积小、光谱响应宽、探测角度大等优点，成为诸多学者研究的热点领域之一。

图1，基于Au纳米阵列SPP的光电探测器件的光学及电学特性表征

表征纳米器件共振波长/共振吸收的微区光谱是微型光电探测器件研究中必不可少的检测手段。图1a 和 1c 分别是文献中一种基于金属纳米阵列结构表面等离激元的光电探测器件的微观结构和微区吸收光谱，通过调节纳米阵列的长宽高尺寸，可实现等离子体共振波长/共振吸收的调节，进而获得亚波长量级的光场能量调控。

【样品 & 测试】新葡萄奔驰AMG的微区光谱系统为基于 SPP 的光电探测器的表征提供了一种光谱检测方案。图2 是采用该系统获取的基于 Au 纳米阵列结构 SPP 的光电探测器样品的微区透射及反射光谱。将该系统配置新葡萄奔驰AMG不同波段的光纤光谱仪，可灵活地实现可见至近红外超宽波段的光谱测试，精确表征纳米器件的共振波长/共振吸收。

图2，实验测试SPP光电探测器样品的微区透射及反射光谱

新葡萄奔驰AMG的微区光谱系统是基于显微镜的光路进行光谱表征功能拓展的光谱分析装置，它不仅保留了显微镜对微小区域实时成像的特点，更具备了对微区样品在 380~2500nm 波段内的光谱表征能力，实现微米级样品的反射光谱、透射光谱、荧光光谱、拉曼光谱等光谱分析及样品图像的实时采集功能。

【总结】新葡萄奔驰AMG的微区光谱系统可用于表征基于表面等离激元的微型光电探测器件的吸收光谱，该系统可适配于市面上多种型号显微镜，具有测量波段宽、扩展功能强等特点。图3 是复享根据显微镜的光路搭建的一套简易微区光谱系统，为从事微型光电探测器件研究的科研人员提供了一种低成本、高效率的解决方案。

图3，新葡萄奔驰AMG的一种简易微区光谱方案

【参考文献】
✽ Li, Wei, et al. "Metamaterial perfect absorber based hot electron photodetection." Nano Letters (2014). Link

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微区光谱在表面等离激元光电探测器中的应用

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