Geometrical condition for observing Talbot effect in plasmonics infinite metallic groove arrays
Geometrical condition for observing Talbot effect in plasmonics infinite metallic groove arrays
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DOI：
10.1088/1674-1056/27/12/124204
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发表时间：
2018-12-01
影响因子：
1.7
通讯作者：
Zhu, Lian-Qing
中科院分区：
文献类型：
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作者：
Mehdi, Afshari-Bavil;Lou, Xiao-Ping;Zhu, Lian-Qing
本研究提出了具有无限周期性凹槽的金属层中的等离子体塔尔博特效应。采用基于有限元方法的数值方法对推导的非照明侧塔尔博特地毯进行了验证。凹槽深度小于金属层厚度；然而，在特定条件下，表面等离子体激元（SPP）可以穿透凹槽，在金属层下传播，并形成塔尔博特复兴。几何参数通过凹槽宽度、间隙尺寸、周期和波长来指定，并且通过引入两个开口率参数来确定它们的合适值。为了定量比较不同的塔尔博特地毯，我们引入了新的参数，例如表征塔尔博特图像周期性的 R 方。地毯的 R 平方越高，塔尔博特距离与非近轴近似越一致。我们相信，我们的结果可以帮助理解 SPP 的本质，也有助于在基于 Talbot 图像的应用（包括成像、光学系统和测量）中探索这种现象。
The plasmonics Talbot effect in metallic layer with infinite periodic grooves is presented in this study. Numerical approach based on the finite element method is employed to verify the derived Talbot carpet on the non-illumination side. The groove depth is less than the metallic layer thickness; however, for specific conditions, surface plasmons polaritons (SPPs) can penetrate through grooves, propagate under the metallic layer, and form Talbot revivals. The geometrical parameters are specified via groove width, gap size, period, and wavelength, and their proper values are determined by introducing two opening ratio parameters. To quantitatively compare different Talbot carpets, we introduce new parameters such as R-square that characterizes the periodicity of Talbot images. The higher the R-square of a carpet, the more coincident with non-paraxial approximation the Talbot distance becomes. We believe that our results can help to understand the nature of SPPs and also contribute to exploring this phenomenon in Talbot-image-based applications, including imaging, optical systems, and measurements.