具有高传输效率的独立等离子体金属-介质-金属带通滤波器。
Free-standing plasmonic metal-dielectric-metal bandpass filter with high transmission efficiency.
机构信息
National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, 22 Hankou Road, Nanjing, 210093, China.
School of Electronic Science and Engineering, Nanjing University, 22 Hankou Road, Nanjing, 210093, China.
出版信息
Sci Rep. 2017 Jun 28;7(1):4357. doi: 10.1038/s41598-017-04540-9.
Plasmonic spectrum filtering devices based on metallic nanostructures have attracted wide attention due to their good reliability, ease of fabrication, and wideband tunability. However, the presence of thick substrate significantly limits the structure's longitudinal size for further optoelectronic integration and reduces the devices' performance. Here we propose and demonstrate an ultra-thin plasmonic bandpass filter based on free-standing periodic metal-dielectric-metal stack geometry working in the near-infrared wavelength range. The coupling between free-space electromagnetic waves and spatially confined plasmonic modes in the designed structure is systematically investigated. As demonstrated in the calculation and experiment, the free-standing plasmonic filters have more than 90% transmission efficiency and superior angular tolerance. The experimental results are in good agreement with the theoretical calculations. These artificial nanostructured filtering devices may find potential applications in the extremely compact device architectures.
基于金属纳米结构的等离子体光谱滤波装置由于其良好的可靠性、易于制造和宽带可调谐性而受到广泛关注。然而，厚衬底的存在显著限制了结构的纵向尺寸，不利于进一步的光电集成，并降低了器件的性能。在这里，我们提出并演示了一种基于独立式周期性金属-电介质-金属堆叠结构的超薄膜等离子体带通滤波器，该滤波器在近红外波长范围内工作。我们系统地研究了设计结构中自由空间电磁波与空间限制等离子体模式之间的耦合。如计算和实验所示，独立式等离子体滤波器具有超过 90%的传输效率和优异的角度容限。实验结果与理论计算吻合较好。这些人工纳米结构滤波器件在极其紧凑的器件架构中可能具有潜在的应用。
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