Study Of Light Field Control And Optical Multiparameter Detection Based On Metamaterials

Metamaterials and metasurfaces are artificial electromagnetic materials and have novel electromagnetic properties not found in natural media.The interaction between microstructure arrays of metamaterials and electromagnetic waves can be used to effectively manipulation the characteristics of electromagnetic wave,such as amplitude,polarization,and phase.Compared with traditional optical components,metamaterials and metasurfaces have the characteristics of compact structure and novel function in light field control.In addition,since intensity,polarization,and phase profiles can be all loaded or modulated by the measured information,light wave can provide a multi-dimensional means of information detection.However,traditional polarization and phase detection methods have the disadvantages of complex optical paths and bulky volume.The unique advantages of metamaterials and metasurfaces in light field control provide new research ideas for designing optical multiparameter detection systems with simple structures and high integration.In this thesis,the relevant theoretical and technical studies on metamaterials and metasurfaces in light field control and optical multi-parameter detection are carried out.The main research results and innovations of this dissertation include:(1)The phase control ability of metallic helical metamaterials to transmitted circularly polarized light is studied.For the first time,we theoretically study the influence of various structural parameters of helical metamaterials on the phase of transmitted circular polarization light,and a simple and effective phase control method has been found.Then,a composite helical metamaterial structure is proposed,which can realize phase control with high efficiency.(2)A transmissive metalens array which can realize simultaneous detection of optical multi-parameter is designed and experimentally verified for the first time.The metalens is operating at the 1550 nm,and can converge 6 different polarization components of the transmitted light at different focal points on the focal plane.By measuring the intensity and center position of the focused spots,the polarization and phase distribution of the beam can be obtained.The experimental results show that the average focusing efficiency of the metalens array can reach 28%,the relative errors of polarization state and wavefront phase detection can reach 4.83% and 8.0%,respectively.(3)The optimal design and experimental study of metalens array are carried out.By reducing the number of sub-metalenses in the metalens array from 6 to 4,and optimizing the selection of the unit structure,the spatial resolution of the metalens array is improved by nearly 1.5 times,and the focusing efficiency is further improved.The experimental results show that the average focusing efficiency of the optimized metalens array can reach48%,and the relative errors of polarization state and wavefront phase detection can reach4.24% and 6.4%,respectively.(4)Based on the optimized design method,the design schemes of metalens array operating at medium wave infrared 4 ?m and long wave infrared 10 ?m are proposed,respectively.The simulation results show that the metalens arrays have good optical characteristics,with average focusing efficiency of 69% and 77%,and relative errors of polarization state measurement of 0.47% and 0.024%,respectively.The results show that this optical multi-parameter detection method is suitable for any band of light wave,and the proposed method is of great scientific significance and application value in many fields of optics.