Metalens,characterized by their unique functions and distinctive physical properties,have gained significant attention for their potential applications.To further optimize the performance of metalens,it is necessary t...Metalens,characterized by their unique functions and distinctive physical properties,have gained significant attention for their potential applications.To further optimize the performance of metalens,it is necessary to characterize the phase modulation of the metalens.In this study,we present a multi-distance phase retrieval system based on optical field scanning and discuss its convergence and robustness.Our findings indicate that the system is capable of retrieving the phase distribution of the metalens as long as the measurement noise is low and the total length of the scanned light field is sufficiently long.This system enables the analysis of focal length and aberration by utilizing the computed phase distribution.We extend our investigation to measure the phase distribution of the metalens operating in the near-infrared(NIR)spectrum and identify the impact of defects in the sample on the phase.Additionally,we conduct a comparative analysis of the phase distribution of the metalens in air and ethanol and observe the variations in the phase modulation of the metalens in different working mediums.Our system provides a straightforward method for the phase characterization of metalens,aiding in optimizing the metalens design and functionality.展开更多
基金supported by National Key R&D Program of China(2023YFA1406900 and 2022YFA1404800)the University Grants Committee/Research Grants Council of the Hong Kong Special Administrative Region,China(Project No.AoE/P-502/20,CRF Project:C1015-21E,C5031-22G,and GRF Project:CityU15303521,CityU11305223,CityU11310522,CityU11300123)+7 种基金City University of Hong Kong(Project Nos.9380131,9610628,and 7005867)National Natural Science Foundation of China(Nos.62375232,62305184,12221004,12234007 and 12321161645)Major Program of National Natural Science Foundation of China(Grant Nos.T2394480,T2394481)Science and Technology Commission of Shanghai Municipality(22142200400,21DZ1101500,2019SHZDZX01 and 23DZ2260100)Project funded by China Postdoctoral Science Foundation(BX20220093)Shanghai Yangfan Project(23YF1415300)Applied Basic Research Foundation of Guangdong Province(2023A1515012932)Science,Technology and Innovation Commission of Shenzhen Municipality(WDZC20220818100259004).
文摘Metalens,characterized by their unique functions and distinctive physical properties,have gained significant attention for their potential applications.To further optimize the performance of metalens,it is necessary to characterize the phase modulation of the metalens.In this study,we present a multi-distance phase retrieval system based on optical field scanning and discuss its convergence and robustness.Our findings indicate that the system is capable of retrieving the phase distribution of the metalens as long as the measurement noise is low and the total length of the scanned light field is sufficiently long.This system enables the analysis of focal length and aberration by utilizing the computed phase distribution.We extend our investigation to measure the phase distribution of the metalens operating in the near-infrared(NIR)spectrum and identify the impact of defects in the sample on the phase.Additionally,we conduct a comparative analysis of the phase distribution of the metalens in air and ethanol and observe the variations in the phase modulation of the metalens in different working mediums.Our system provides a straightforward method for the phase characterization of metalens,aiding in optimizing the metalens design and functionality.
