Plasmonic nanoresonators for high-resolution colour filtering and spectral imaging
Plasmonic nanoresonators for high-resolution colour filtering and spectral imaging
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DOI：
10.1038/ncomms1058
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发表时间：
2010-08-01
影响因子：
16.6
通讯作者：
Guo, L. Jay
中科院分区：
文献类型：
--
作者：
Xu, Ting;Wu, Yi-Kuei;Guo, L. Jay
彩色和光谱成像系统通常使用滤光片和玻璃棱镜来分散不同波长的光。随着集成器件的小型化，成像传感器的研究主要集中在高效率、低功耗和小尺寸的设计上，这对传统的基于着色剂的滤波和基于棱镜的光谱分离技术提出了挑战。在这种情况下，基于表面等离子体激元的纳米结构是有吸引力的，因为它们的小尺寸和有效地操纵光的能力。在这篇文章中，我们使用自由空间波和空间受限模式之间的选择性转换，在由亚波长金属-绝缘体-金属堆叠阵列形成的等离子体纳米谐振器中，表明通过这种阵列的透射光谱可以通过使用简单的设计规则得到很好的控制，并且可以实现能够透射任意颜色的高效滤色器。这些人造纳米结构提供了一种具有非常紧凑的设备架构的高空间分辨率滤色和光谱成像的方法。
Colour and spectral imaging systems typically use filters and glass prisms to disperse light of different wavelengths. With the miniaturization of integrated devices, current research on imaging sensors focuses on novel designs aiming at high efficiency, low power consumption and slim dimension, which poses great challenges to the traditional colourant-based filtering and prism-based spectral splitting techniques. In this context, surface plasmon-based nanostructures are attractive due to their small dimensions and the ability to efficiently manipulate light. In this article we use selective conversion between free-space waves and spatially confined modes in plasmonic nanoresonators formed by subwavelength metal-insulator-metal stack arrays to show that the transmission spectra through such arrays can be well controlled by using simple design rules, and high-efficiency colour filters capable of transmitting arbitrary colours can be achieved. These artificial nanostructures provide an approach for high spatial resolution colour filtering and spectral imaging with extremely compact device architectures.