基于固态等离子体的可重构双功能超材料极化转换器  

Reconfigurable Bi-functional Metamaterial Polarization Converter Based on Solid-state Plasma

作　　者：王泽 田晋平[1] 杨荣草[1] WANG Ze;TIAN Jin-ping;YANG Rong-cao(College of Physics and Electronic Engineering,Shanxi University,Taiyuan 030006,China)

机构地区：[1]山西大学物理电子工程学院,山西太原030006

出　　处：《量子光学学报》2023年第2期91-101,共11页Journal of Quantum Optics

基　　金：国家自然科学基金(61775126);集成光电子学国家重点实验室开放课题(IOSKL2019KF16)。

摘　　要：基于施加偏置电压后固态等离子体(SSP)可以在金属态或介质态之间进行切换的特性,设计了一种基于SSP材料的可重构双功能超材料极化转换器。研究结果表明,当SSP为金属态时,所设计的超材料极化转换器可以在较宽的频率范围内实现反射式线–线极化转换,转换效率超过98%。当SSP为介质态时,所设计的超材料极化转换器工作在透射模式下,此时可以实现透射式线–圆极化转换。通过表面电流分布解释了极化转换的物理机理;通过改变结构参数,研究了SSP处于金属态和介质态时的极化转换性能,证明了所设计的基于SSP的超材料极化转换器不仅具有可重构的极化转换特性,而且对结构参数的轻微变化能够保持良好的鲁棒性,有利于实际制作和实验验证。此外,入射角度的轻微变化,对两种状态下的极化转换特性不会产生大的影响,也满足实际需求。所设计的超材料极化转换器不仅可以满足不同工作模式、不同转换性能的应用需求,而且在通信、传感和成像方面具有潜在应用前景。In terms of the characteristic of solid-state plasma(SsP),which can be switched dynamically between the metallic state and dielectric state through applying an external bias voltage,a reconfigurable bi-functional metamaterial polarization converter based on SSP is designed.Research results show that when SSP is in metallic state,the proposed metamaterial polarization converter can achieve reflective linear-linear polarization conversion within a wider frequency range with polarization conversion efficiency larger than 98%.When SSP is in a dielectric state,the designed converter works in the mode of transmission,and under this circumstance,it can achieve transmissive linear-circular polarization conversion.The background physical mechanism of the polarization conversion is interpreted by the studying the distribution of surface currents under the two states.Furthermore,through changing the structural parameters,changes in polarization conversion performance are studied both for the metallic state SSP and dielectric state SSP,which prove that the proposed SSP-based metamaterial polarization converter not only possesses reconfigurable polarization conversion property,but also can maintain good Robustness to the small change of structural parameters.Both these properties will benefit the experimental verification and real fabrication.Meanwhile,the small change of incident angles will not also bring clear change in the conversion performance,which can ensure real application requirements.As a result,the proposed SSP based reconfigurable metamaterial polarization converter can not only meet the application of different working modes,different conversion characteristics,but also have great potential applications in the area of communication,sensing and detection,imaging,and so on.

关 键 词：固态等离子体 线–线极化转换 线–圆极化转换 可重构 

分 类 号：O436.3[机械工程—光学工程]