聊城大学学报（自然科学版）2024，Vol.37Issue(1)：16-22,7.DOI:10.19728/j.issn1672-6634.2023070008
基于TiO2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 TiO2 in the Near Infrared Operating
摘要
Abstract
A converging lens based on TiO2 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 10.4 μm,and the full width at half maximum of the focal spot of 0.61 μm.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 a-chieve 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Key words
high-contrast sub-wavelength gratings/non-periodic concentric circular structure/focusing lens/high focusing efficiency分类
信息技术与安全科学引用本文复制引用
李真,牛慧娟,高松,范鑫烨,段晓峰,黄永清..基于TiO2的近红外大数值孔径、高聚焦效率、高透射率会聚透镜[J].聊城大学学报（自然科学版）,2024,37(1):16-22,7.基金项目
国家重点研发计划(2018YFB2200803) （2018YFB2200803）
山东省自然科学基金项目(ZR2022MF305,ZR2022MF253,ZR2021MF053,ZR2021MF070) （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) （北京邮电大学）
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 （318052168）
科技型中小企业创新能力提升工程(2022TSGC2570) （2022TSGC2570）
教育部产学协同育人项目(220605160271242,221002802140950,220906093200103)资助 （220605160271242,221002802140950,220906093200103）
