微型等离子体波板
Miniature plasmonic wave plates
摘要：
在波片中实现的线性双折射是控制光的偏振状态的自然方式。我们报告了一种利用表面等离子体设计微型平面波片的一般方法。这里考虑的谐振光学器件是由椭圆形天线光栅包围的单个圆形孔径。每个椭圆的短轴和长轴的差异在表面等离子体上引入相移，这使得能够实现四分之一波片。此外，实验结果和理论分析表明，所采用的一般方法不影响偏振态的光学相干性，仅改变椭圆光栅的形状，就可以完全探测到单位庞加莱球的表面。
英文摘要：
Linear birefringence, as implemented in wave plates, is a natural way to control the state of polarization of light. We report on a general method for designing miniature planar wave plates using surface plasmons. The resonant optical device considered here is a single circular aperture surrounded by an elliptical antenna grating. The difference in short and long axis of each ellipses introduces a phase shift on the surface plasmons which enables the realization of a quarter wave plate. Furthermore, the experimental results and the theoretical analysis show that the general procedure used does not influence the optical coherence of the polarization state and allows us to explore completely the surface of the unit Poincare sphere by changing only the shape of the elliptical grating.
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