论文标题
超出异常反射的耦合等离子波动力学：可见的相位梯度铜元面，可见
Coupled plasmon wave dynamics beyond anomalous reflection: phase gradient Copper metasurface for visible to the near infrared spectrum
论文作者
论文摘要
在纳米级光子设备中，跨表面2D光学元件对多功能性的需求迅速增加。为了探索设计指标中的微调，我们使用有限差分时间域模拟对梯形形状铜元面进行了重新研究，以有效地使用两种不同功能的线性极化光有效地使用线性极化的光。从等离子体带结构中，我们可以看到几何形状中的不对称程度如何影响行进等离子模式的有效共振耦合，以及不同类型的模式杂交轮廓与纳米坦纳的几何形状相关。调整纳米安坦的长度，我们可以激发这种配置支持的有效等离子模式，并从正常入射自由空间光线上单向向表面波单向引导，以可见到红外范围。定向的表面等离子体极化量根据纳米坦纳的长度和波长，在连续金属层的顶部和底部表面之间均具有反对称和对称模式。该提出的铜元面是优化的，用于远场应用（600-900 nm）异常梁转向，平均效率为65％，最大角度为64度。这项工作使人们对如何在小脚印等离子设备，波导模式控制以及具有波长依赖性功能的光束转向中实现一个元表面。
In nanoscale photonic devices, the demand for multifunctionality from metasurface 2D optics increases rapidly. To explore fine-tuning in the design metric, we reinvestigated the trapezoid shape copper metasurface with Finite-Difference Time-Domain simulation for efficiently using linearly polarized light for two different functionalities. From the plasmonic band structure, we see how the degree of asymmetry in geometry affects the efficient resonance coupling of the traveling plasmonic modes, along with different types of mode hybridization profiles related to the nanoantenna's geometric shape. Tuning the nanoantenna's length, we can excite the effective plasmon mode supported by this configuration and guide out surface wave unidirectionally from the normal incident free-space light for visible to infrared range. Directed surface plasmon polariton has both antisymmetric and symmetric modes oscillating between the top and bottom surface of the continuous metal layer depending on the nanoantenna's length and wavelength. This proposed Copper metasurface is optimized for far-field application of broadband (600-900 nm) anomalous beam steering for an average of 65 percent efficiency with a maximum of 64 degree angle. This work brings more understanding of how one metasurface can be implemented in small footprint plasmonic devices, waveguide mode controlling, as well as beam steering with their wavelength dependent functionality.
