Impact of Nonlocality on Group Delay and Reflective Behavior Near Surface Plasmon Resonances in Otto Structure.
Impact of Nonlocality on Group Delay and Reflective Behavior Near Surface Plasmon Resonances in Otto Structure.
复制标题
非局域性对奥托结构中群延迟和近表面等离子体共振反射行为的影响
DOI：
10.3390/nano11071780
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发表时间：
2021-07-08
期刊：
影响因子：
--
通讯作者：
Wang LG
中科院分区：
文献类型：
--
作者：
Wang L;Liang S;Zhou Y;Wang LG
在本工作中，我们研究了非局域性对Otto结构的表面等离子体共振附近的光学响应的影响，并在流体力学模型中考虑了这种非局域性。通过分析Drude模型和流体力学模型预测的系统色散关系和光学响应，发现非局域效应对大的传播波矢敏感，并且存在一个临界入射角和厚度。当考虑非局部效应时，临界点向较小的值移动。在这一点之前，反射光脉冲的吸收增强;然而，在这一点之后，情况逆转。在局域和非局域理论计算的频率扫描的两个不同临界点之间的区域，反射光脉冲的群延迟表现出相反的行为。用复频率平面上的极点和零点唯象模型解释了这些结果。我们的工作可能有助于在纳米级的光-物质相互作用的基本理解和光学器件的设计。
In this work, we study the effects of nonlocality on the optical response near surface plasmon resonance of the Otto structure, and such nonlocality is considered in the hydrodynamic model. Through analyzing the dispersion relations and optical response predicted by the Drude’s and hydrodynamic model in the system, we find that the nonlocal effect is sensitive to the large propagation wavevector, and there exists a critical incident angle and thickness. The critical point moves to the smaller value when the nonlocal effect is taken into account. Before this point, the absorption of the reflected light pulse enhances; however, the situation reverses after this point. In the region between the two different critical points in the frequency scan calculated from local and nonlocal theories, the group delay of the reflected light pulse shows opposite behaviors. These results are explained in terms of the pole and zero phenomenological model in complex frequency plane. Our work may contribute to the fundamental understanding of light–matter interactions at the nanoscale and in the design of optical devices.
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