基于超表面的中红外圆偏振分束器  

Mid-Infrared Circularly Polarized Beam Splitter Based on Metasurfaces

作　　者：韩玉 苏莹 周心炜 宋晨阳 贾婧媛 曹暾 Han Yu;Su Ying;Zhou Xinwei;Song Chenyang;Jia Jingyuan;Cao Tun(School of Optoelectronic Engineering and Instrumentation Science,Dalian University of Technology,Dalian 116024,Liaoning,China)

机构地区：[1]大连理工大学光电工程与仪器科学学院,辽宁大连116024

出　　处：《光学学报》2024年第19期316-322,共7页Acta Optica Sinica

基　　金：国家自然科学基金青年科学基金(62105054)。

摘　　要：基于广义斯涅耳定律、几何相位原理,采用矩阵傅里叶光学方法设计了一种4μm波段的圆偏振分束器,实现了方向角依次为60°、120°、0°、0°,椭圆度依次为5.83、5.83、1、5.83的4种圆偏振光的分束,分束角度为6.52°,这4种偏振态可以实现斯托克斯偏振成像。通过仿真得到的分束效率均在45%以上,接近分束效率的理论最大值。该偏振分束器可以实现4种不同圆偏振态的高效率分束,为海面、空中等水雾、云雾、烟雾环境中清晰成像提供了技术支撑,也为中红外圆偏振成像系统的集成化发展提供了新的思路。Objective Polarization beam splitters are indispensable components in polarization imaging systems.These systems can acquire intensity information and polarization information almost simultaneously,enriching the information content of target images and significantly enhancing image detection accuracy.In recent years,polarization imaging detection technology has emerged as a key technology for target tracking and recognition in both civil and military sectors.The polarization beam splitting components of traditional polarization imaging systems mostly rely on various lens groups,which makes the imaging system structure complex and bulky and is not conducive to the development of miniaturization of imaging systems.Metasurfaces,artificially defined sub-wavelength periodic or aperiodic array structures,offer flexible electromagnetic wave regulation through phase and amplitude adjustments,leading to more compact electromagnetic control devices.A polarization beam splitter employing metasurfaces is lightweight and structurally simple,favoring integrated development in modern optical systems.Polarization imaging spans various optical bands;notably,the 3‒5μm band in the mid-infrared serves as an atmospheric window band.This band boasts strong anti-interference capabilities,making it ideal for military applications like nighttime target detection and sea level measurement.Most existing polarization imaging systems utilize linearly polarized light,which is heavily influenced by environmental factors,causing significant losses and reducing imaging intensity and clarity when used in mist,clouds,and smoke.Circularly polarized light,conversely,offers superior anti-interference capabilities and propagation stability.Given this background,there is a pressing need to explore mid-infrared circularly polarized beam splitters.Methods Phase and amplitude are fundamental properties of electromagnetic waves,and their manipulation allows for beam control.According to the phase propagation principle,the phase of a metasurface varies w

关 键 词：矩阵傅里叶光学 超表面 圆偏振分束器 红外圆偏振成像 

分 类 号：O434.3[机械工程—光学工程]