Uniformly polarized multi-output illumination by metasurfaces performing near-complete conversion of unpolarized light  

作　　者：Neuton Li Jihua Zhang Shaun Lung Dragomir N.Neshev Andrey A.Sukhorukov 

机构地区：[1]Australian National University,Research School of Physics,ARC Centre of Excellence for Transformative Meta-Optical Systems,Department of Electronic Materials Engineering,Canberra,Australia [2]Songshan Lake Materials Laboratory,Dongguan,China [3]Friedrich-Schiller University,Institute of Applied Physics,Jena,Germany

出　　处：《Advanced Photonics Nexus》2024年第6期9-15,共7页先进光子学通讯(英文)

基　　金：the support of the Australian Research Council(Grant Nos.NI210100072,LP180100904,and CE200100010);performed in part at the Melbourne Centre for Nanofabrication(MCN)in the Victorian Node of the Australian National Fabrication Facility(ANFF).

摘　　要：Many technologies,including dot projectors and lidar systems,benefit greatly from using polarized illumination.However,conventional polarizers and polarizing beam splitters have a fundamental limit of 50%efficiency when converting unpolarized light into one specific polarization.Here,we overcome this restriction and achieve near-complete conversion of unpolarized light to a spatially uniform polarization state over several output directions with our topology-optimized metasurfaces.Our results provide a path toward greatly improving the efficiency of common unpolarized light sources,such as LEDs,for a variety of applications requiring uniformly polarized illumination.Our fabricated metasurface realizes a 70%conversion efficiency,surpassing the aforementioned limit,and achieves a polarization extinction ratio exceeding 20,when characterized with laboratory measurements.We further demonstrate that arbitrary power splitting can be achieved between three or more polarized outputs,offering flexibility in target illumination.

关 键 词：metasurfaces polarization diffraction topology optimization 

分 类 号：O43[机械工程—光学工程]