基于TiO_(2)的近红外大数值孔径、高聚焦效率、高透射率会聚透镜  

Focusing Lens with Large Numerical Aperture,High Focusing Efficiency and High Transmissivity Based on TiO_(2)in the Near Infrared Operating

作　　者：李真 牛慧娟[1,2,3] 高松 范鑫烨 段晓峰[3] 黄永清[3] LI Zhen;NIU Huijuan;GAO Song;FAN Xinye;DUAN Xiaofeng;HUANG Yongqing(School of Physical Science and Information Engineering Liaocheng University,Liaocheng 252059,China;Shandong Key Laboratory of Optical Communication Science and Technology,Liaocheng University,Liaocheng 252059,China;State Key Laboratory of Information Photonics and Optical Communications,Beijing University of Posts and Telecommunications,Beijing 100876,China)

机构地区：[1]聊城大学物理科学与信息工程学院,山东聊城252059 [2]聊城大学山东省光通信科学与技术重点实验室,山东聊城252059 [3]北京邮电大学信息光子学与光通信重点实验室,北京100876

出　　处：《聊城大学学报（自然科学版）》2024年第1期16-22,共7页Journal of Liaocheng University:Natural Science Edition

基　　金：国家重点研发计划(2018YFB2200803);山东省自然科学基金项目(ZR2022MF305,ZR2022MF253,ZR2021MF053,ZR2021MF070);信息光子学与光通信国家重点实验室(北京邮电大学)开放基金项目(IPOC2021B07);山东省高校2021年青年引进与培养计划;聊城大学博士科研(318052168)资助;科技型中小企业创新能力提升工程(2022TSGC2570);教育部产学协同育人项目(220605160271242,221002802140950,220906093200103)资助。

摘　　要：利用相位调控原理设计了一种基于TiO_(2)材料的具有非周期同心圆环形高折射率差亚波长光栅结构的会聚透镜,可实现大数值孔径、高聚焦效率、高透射率、低损耗特性,同时具有体积小、易集成的优点。采用时域有限差分法对提出的透镜结构进行仿真和分析,工作波长为850 nm时,该透镜透射率为90.5%,焦距约为10.4μm,焦斑的半高全宽为0.61μm。通过对仿真得到的数据进行分析,可得数值孔径为0.92,聚焦效率高达91.07%,损耗为0.41 dB,平衡了高数值孔径与高聚焦效率之间的矛盾,可在小器件直径下接近衍射极限实现点会聚效果。A converging lens based on TiO_(2)material with a non-periodic concentric circular high-contrast sub-wavelength gratings structure has been designed using phase modulation principles.This lens achieves a large numerical aperture,high focusing efficiency,high transmittance,and low-loss characteristics.It also possesses the advantages of compact size and easy integration.The lens structure was simulated and analyzed using the finite-difference time-domain method.At a working wavelength of 850 nm,the lens had a transmission efficiency of 90.5%,the focal length of approximately 10.4μm,and the full width at half maximum of the focal spot of 0.61μm.By analyzing the simulation data,the numerical aperture of the lens was determined to be 0.92,with a high focusing efficiency of 91.07%and the loss of 0.41 dB.The lens balances the contradiction between high numerical aperture and high focusing efficiency,and can achieve point convergence close to the diffraction limit in a small device diameter.

关 键 词：高折射率差亚波长光栅 非周期同心圆环形结构 会聚透镜 高聚焦效率 

分 类 号：TN214[电子电信—物理电子学] O436[机械工程—光学工程]