论文标题
宽带多功能等离激元极化转换器基于多模型干扰耦合器
Broadband Multifunctional Plasmonic Polarization Converter based on Multimode Interference Coupler
论文作者
论文摘要
我们提出了一个多功能集成的等离子体光电极化转换器，用于在硅平台上的二磷化物膜中的极化反弹。使用紧凑型1 $ \ times $ 4多模型干扰耦合器，该设备可以提供同时的半波板和四分之一波板（HWP和QWP）功能，在该功能中，后者产生两个准圆形偏振光束，具有相反的旋转和相反的旋转和拓扑电荷，$ l $ = $ = $ = $ \ pm \ pm \ pm $ \ $ \ $ \ $ \ $ \ $ \ $ \ $ 1。我们的设备采用了两部分HWP，可在整个C上获得$ \ geq $ 91％的较大转换效率到U电信频段，而它的转换效率为$ \ geq $ \ geq $ 95％以$ \ sim $ \ sim $ 86％的$ 86％的C向U频段。我们的设备还说明了QWP功能，其中横向电气和横向磁模式之间的透射对比在整个C频段上约为$ 0 dB，而C到U频段的55％。我们希望该设备可以成为实现超芯片上极化反弹和实验室芯片生物传感平台的有前途的构建基础。最后，我们提出的设备允许使用极化和角动量自由度，这使其对量子信息处理有吸引力。
We propose a multifunctional integrated plasmonic-photonic polarization converter for polarization demultiplexing in an indium-phosphide membrane on silicon platform. Using a compact 1$\times$4 multimode interference coupler, this device can provide simultaneous half-wave plate and quarter-wave plate (HWP and QWP) functionalities, where the latter generates two quasi-circular polarized beams with opposite spins and topological charges of $l$ = $\pm$1. Our device employs a two-section HWP to obtain a very large conversion efficiency of $\geq$ 91% over the entire C to U telecom bands, while it offers a conversion efficiency of $\geq$ 95% over $\sim$ 86% of the C to U bands. Our device also illustrates QWP functionality, where the transmission contrast between the transverse electric and transverse magnetic modes is $\approx$ 0 dB over the whole C band and 55% of the C to U bands. We expect this device can be a promising building block for the realization of ultracompact on-chip polarization demultiplexing and lab-on-a-chip biosensing platforms. Finally, our proposed device allows the use of the polarization and angular momentum degrees of freedom, which makes it attractive for quantum information processing.
