Abstract
提出了基于black phosphorus(BP)纳米棒耦合的多频段等离激元诱导透明(PIT)电磁模型, 通过FDTD和辐射双振荡器(RTO)模型从数值计算和理论研究两方面分析了模型的电磁特性. 结果表明: 由于不同长度的BP纳米棒之间的明-明耦合, 可以在实现单频段PIT效应的基础之上, 进一步产生双频段和三频段的PIT效应. 其次, 通过改变BP的弛豫速率<inline-formula><tex-math id="M1">\begin{document}${n_{\rm{s}}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20201331_M1.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20201331_M1.png"/></alternatives></inline-formula>, 可以在单频段、双频段、三频段PIT模型中同时实现透明窗谐振频率的可调性. 当<inline-formula><tex-math id="M2">\begin{document}${n_{\rm{s}}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20201331_M2.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20201331_M2.png"/></alternatives></inline-formula>增大时, 各频段PIT窗口的谐振频率将会逐渐增大, 发生蓝移. 进一步研究了单频段PIT模型的传感特性, 该模型随背景材料折射率变化的灵敏度(sensitivity)达到了6110.6 (nm/RIU), 优值系数(FOM)达到了7.39 (1/RIU)这为多频带滤波、超灵敏传感器的设计提供了理论参考.
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