We propose a promising method to develop flexible,compact,and tunable light-activated film diffractive optical elements(FDOEs)with exceptional diffraction efficiency,by integrating liquid crystal(LC)geometric phase-ba...We propose a promising method to develop flexible,compact,and tunable light-activated film diffractive optical elements(FDOEs)with exceptional diffraction efficiency,by integrating liquid crystal(LC)geometric phase-based diffractive optical elements(DOEs)with a specifically designed light-activated LC polymer(LCP)film.Arbitrary film bending induced by UV/Vis irradiation is realized through precise mesogens arrangement within the LCP film,enabling 1D and 2D beam steering,as well as dynamic and reversible switching between structured and Gaussian lights after cooperating with the DOE design.Furthermore,remarkable fatigue resistance,solvent resistance,and thermal stability are demonstrated,providing a solid material platform for advanced optical applications.展开更多
Pancharatnam-Berry(PB)phase elements are widely used for optical field modulation due to their precise control over beam amplitude and phase.However,conventional PB elements are inherently static,with fixed modulation...Pancharatnam-Berry(PB)phase elements are widely used for optical field modulation due to their precise control over beam amplitude and phase.However,conventional PB elements are inherently static,with fixed modulation functions post-fabrication,limiting their adaptability in complex application scenarios.In this paper,we propose a moiré-type PB element comprising two specially designed PB elements.The proposed element attaches the two spin states with rotation-dependent PB phases while preserving the spin,thereby enabling dynamic rotation-tunability of the PB phase.As a functional validation,we experimentally demonstrate the dynamic control over the rotation rate of the polarization-rotating beam.The moiré-type PB element was designed using the checker-board-phase encoding method and fabricated in liquid crystal via SD 1-based micro-lithography.A back-propagation correction is introduced to eliminate the diffraction effects caused by the element gap.An adjustable rotation rate of±240 deg/cm is achieved through±160 deg angular offset.Owing to its compact structure with high integration and operation simplicity,the moiré-type PB element offers a novel dynamic modulation solution for structured light field generation,particle manipulation,and advanced laser processing.展开更多
基金the National Key Research and Development Program of China(No.2022YFA1203700)the National Natural Science Foundation of China(Nos.62275081,62035008,and 22305079)+4 种基金the Innovation Program of Shanghai Municipal Education Commission,Scientific Committee of Shanghai(No.2021-01-07-00-02-E00107)the“Shuguang Program”of Shanghai Education Development Foundation,the Shanghai Municipal Education Commission(No.21SG29)the Shanghai Sailing Program(No.23YF1409000)the Fellowship of China National Postdoctoral Program for Innovative Talents(No.BX20230125)the Postdoctoral Fellowship Program of CPSF(No.GZB20240218)。
文摘We propose a promising method to develop flexible,compact,and tunable light-activated film diffractive optical elements(FDOEs)with exceptional diffraction efficiency,by integrating liquid crystal(LC)geometric phase-based diffractive optical elements(DOEs)with a specifically designed light-activated LC polymer(LCP)film.Arbitrary film bending induced by UV/Vis irradiation is realized through precise mesogens arrangement within the LCP film,enabling 1D and 2D beam steering,as well as dynamic and reversible switching between structured and Gaussian lights after cooperating with the DOE design.Furthermore,remarkable fatigue resistance,solvent resistance,and thermal stability are demonstrated,providing a solid material platform for advanced optical applications.
基金National Key Research and Development Program of China(2022YFA1404800)National Natural Science Foundation of China(12474338,12474298,62305271,62175200,12374279,62475217)Fundamental Research Funds for the Central Universities(5110240015).
文摘Pancharatnam-Berry(PB)phase elements are widely used for optical field modulation due to their precise control over beam amplitude and phase.However,conventional PB elements are inherently static,with fixed modulation functions post-fabrication,limiting their adaptability in complex application scenarios.In this paper,we propose a moiré-type PB element comprising two specially designed PB elements.The proposed element attaches the two spin states with rotation-dependent PB phases while preserving the spin,thereby enabling dynamic rotation-tunability of the PB phase.As a functional validation,we experimentally demonstrate the dynamic control over the rotation rate of the polarization-rotating beam.The moiré-type PB element was designed using the checker-board-phase encoding method and fabricated in liquid crystal via SD 1-based micro-lithography.A back-propagation correction is introduced to eliminate the diffraction effects caused by the element gap.An adjustable rotation rate of±240 deg/cm is achieved through±160 deg angular offset.Owing to its compact structure with high integration and operation simplicity,the moiré-type PB element offers a novel dynamic modulation solution for structured light field generation,particle manipulation,and advanced laser processing.
