论文标题
各向异性引起的外部手性和表面等离子体偏振子的手性歧视
Anisotropy-induced Extrinsic Chirality and Chiral Discrimination of Surface Plasmon Polaritons
论文作者
论文摘要
我们介绍了一个简单的波导结构的特征，该结构由各向异性双重晶体 - 金属手续培养基，各向异性 - 金属 - 归类，并揭示表面等离子体偏极（spps）的手性依赖性分散和传播特性。我们证明了其出色的歧视能力，以构成手性参数的实际和虚构部分的大小和迹象。各向异性在这种性能中起着关键作用，即使手性参数复杂得分，在对映体歧视中的可调能力。最重要的是，手性歧视的物理起源源于系统的外部手性，这是由SPPS和光轴的相互取向引起的。此外，我们还通过将SPPS的固有量子自旋霍尔效应（QSHE）与电磁场分析相关联，阐明了手性区分行为背后的基本物理。这种结构不依赖于复杂的制造，而是提供片上表面敏感生物传感的机会。我们预计我们的工作将刺激大量研究，以研究等离子平台中各向异性诱导的手性传感技术。
We present the characteristics of a simple waveguiding structure constructed by anisotropic birefringent crystal-metal-chiral medium, anisotropic-metal-chiral in short, and reveal the chiral-dependent dispersion and propagation properties of the surface plasmon polaritons (SPPs). We demonstrate its remarkable discrimination ability to the magnitude and sign of both the real and imaginary part of the chirality parameter. The anisotropy plays a key role in such performance and shows tuneable ability in enantiomeric discrimination even when the chirality parameter is complex-valued. Most importantly, the physical origin of chiral discrimination stems from the extrinsic chirality of the system, which arises from the mutual orientation of the SPPs and the optical axis. Moreover, we also clarify the fundamental physics behind the chiral discriminating behaviour by associating the intrinsic quantum spin Hall effect (QSHE) of the SPPs with the electromagnetic field analysis. This structure does not rely on complicated fabrication but provides the opportunity of on-chip surface-sensitive biosensing. We anticipate that our work will stimulate intensive research to investigate the anisotropy-induced chiral sensing techniques in plasmonic platforms.
