Polarization,the vector nature of electromagnetic waves,plays a vital role in optics.Polarization is characterized by the amplitude contrast and phase difference between two orthogonal polarization states.The present ...Polarization,the vector nature of electromagnetic waves,plays a vital role in optics.Polarization is characterized by the amplitude contrast and phase difference between two orthogonal polarization states.The present polarimeters usually perform a series of intensity measurements to carry out the polarization detection,making the process bulky and time-consuming.Thereby,compact and broadband-available polarimetry within a single snapshot is urgently demanded.We propose an all-liquid-crystal polarimeter for broadband polarization detection.It is cascaded by a q-plate and a polarization grating.The former is electrically tuned to meet the half-wave condition,whereas the latter is driven to deviate from this condition.After a polarized light passes through this device followed by a polarizer,its amplitude contrast and phase difference between orthogonal spins are read directly from the diffraction pattern.The intensity contrast between±1st orders depicts the amplitude contrast,whereas the rotating angle of the dark split reveals the phase difference.The Stokes parameters can be calculated accordingly.The polarimeter works in a broad spectral range of 470 to 1100 nm.Through presetting a q-plate array,polarization imaging is demonstrated.It supplies an all-liquid-crystal and full-visible-band tunable Stokes polarimeter that significantly promotes advances in polarization optics.展开更多
Recently discovered reflective Pancharatnam-Berry phase(PB phase)from chiral anisotropic media(e.g.,cholesteric liquid crystal,CLC)has aroused great interest in the emerging frontier of planar optics.However,the singl...Recently discovered reflective Pancharatnam-Berry phase(PB phase)from chiral anisotropic media(e.g.,cholesteric liquid crystal,CLC)has aroused great interest in the emerging frontier of planar optics.However,the single chirality of common CLCs results in the intrinsic limitation of the same spin-selective PB phase manipulation,which means the reversal of the input spin cannot realize the conjugated PB phase.In this work,an innovative scheme based on opposite-chirality-coexisted superstructures is proposed to simultaneously modulate orthogonal circular polarization and get PB phase reversal.Through refilling CLC into a washed-out polymer network with opposite chirality and delicate photo-patterned structures,reflective optical vortex(OV)with opposite topological charges and vector beams with conjugated spiral PB phases are efficiently generated depending on the incident polarization.Furthermore,OV holograms are encoded to reconstruct polarization-selective OV arrays,indicating the strong capability of such opposite-chirality-coexisted anisotropic media.This work provides a new compact platform for planar optics,and sheds light on the architectures and functionalities of chiral superstructures.展开更多
Wavefront control is the fundamental requirement in optical informatics.Planar optics have drawn intensive attention due to the merits of compactness and light weight.However,it remains a challenge to freely manipulat...Wavefront control is the fundamental requirement in optical informatics.Planar optics have drawn intensive attention due to the merits of compactness and light weight.However,it remains a challenge to freely manipulate the dispersion,hindering practical applications,especially in imaging.Here,we propose the concept of frequencysynthesized phase engineering to solve this problem.A phasefront-frequency matrix is properly designed to encode different spatial phases to separate frequencies,thus makes arbitrary dispersion tailoring and even frequency-separated functionalization possible.The periodically rotated director endows cholesteric liquid crystal with a spin and frequency selective reflection.Moreover,via presetting the local initial orientation of liquid crystal,geometric phase is encoded to the reflected light.We verify the proposed strategy by cascading the chiral anisotropic optical media of specifically designed helical pitches and initial director orientations.By this means,planar lenses with RGB achromatic,enhanced chromatic aberration and color routing properties are demonstrated.Inch-sized and high-efficient lenses are fabricated with low crosstalk among colors.It releases the freedom of dispersion control of planar optics,and even enables frequency decoupled phase modulations.This work brings new insights to functional planar optics and may upgrade the performance of existing optical apparatuses.展开更多
基金supported by the National Key Research and Development Program of China(Grant No.2022YFA1203700)the National Natural Science Foundation of China(Grant Nos.62405129 and 62035008)+4 种基金the Natural Science Foundation of Jiangsu Province(Grant No.BK20241197)the China Postdoctoral Science Foundation(Grant No.2024T170396)the Postdoctoral Fellowship Program of CPSF(Grant No.GZC20240678)the Jiangsu Funding Program for Excellent Postdoctoral Talent(Grant No.2024ZB684)the Fundamental Research Funds for the Central Universities(Grant No.021314380244).
文摘Polarization,the vector nature of electromagnetic waves,plays a vital role in optics.Polarization is characterized by the amplitude contrast and phase difference between two orthogonal polarization states.The present polarimeters usually perform a series of intensity measurements to carry out the polarization detection,making the process bulky and time-consuming.Thereby,compact and broadband-available polarimetry within a single snapshot is urgently demanded.We propose an all-liquid-crystal polarimeter for broadband polarization detection.It is cascaded by a q-plate and a polarization grating.The former is electrically tuned to meet the half-wave condition,whereas the latter is driven to deviate from this condition.After a polarized light passes through this device followed by a polarizer,its amplitude contrast and phase difference between orthogonal spins are read directly from the diffraction pattern.The intensity contrast between±1st orders depicts the amplitude contrast,whereas the rotating angle of the dark split reveals the phase difference.The Stokes parameters can be calculated accordingly.The polarimeter works in a broad spectral range of 470 to 1100 nm.Through presetting a q-plate array,polarization imaging is demonstrated.It supplies an all-liquid-crystal and full-visible-band tunable Stokes polarimeter that significantly promotes advances in polarization optics.
基金This work was supported by the National Key R&D Program of China(No.2021YFA1202000)the National Natural Science Foundation of China(NSFC)(Nos.62175101,12004175,62035008,and 62105143)+3 种基金the Natural Science Foundation of Jiangsu Province(Nos.BK20212004,and BK20200311)the Innovation Program for Quantum Science and Technology(No.2021ZD0301500)the Fundamental Research Funds for the Central Universities(No.021314380185)the Innovation and Entrepreneurship Program of Jiangsu Province.
文摘Recently discovered reflective Pancharatnam-Berry phase(PB phase)from chiral anisotropic media(e.g.,cholesteric liquid crystal,CLC)has aroused great interest in the emerging frontier of planar optics.However,the single chirality of common CLCs results in the intrinsic limitation of the same spin-selective PB phase manipulation,which means the reversal of the input spin cannot realize the conjugated PB phase.In this work,an innovative scheme based on opposite-chirality-coexisted superstructures is proposed to simultaneously modulate orthogonal circular polarization and get PB phase reversal.Through refilling CLC into a washed-out polymer network with opposite chirality and delicate photo-patterned structures,reflective optical vortex(OV)with opposite topological charges and vector beams with conjugated spiral PB phases are efficiently generated depending on the incident polarization.Furthermore,OV holograms are encoded to reconstruct polarization-selective OV arrays,indicating the strong capability of such opposite-chirality-coexisted anisotropic media.This work provides a new compact platform for planar optics,and sheds light on the architectures and functionalities of chiral superstructures.
基金supported by the National Key Research and Development Program of China(2022YFA1203703)the National Natural Science Foundation of China(NSFC)(62035008)+1 种基金the Stable Support Fund of State Administration Science Technology and Industry for National Defense(HTKJ2022KL504003)Fundamental Research Funds for the Central Universities(021314380233).
文摘Wavefront control is the fundamental requirement in optical informatics.Planar optics have drawn intensive attention due to the merits of compactness and light weight.However,it remains a challenge to freely manipulate the dispersion,hindering practical applications,especially in imaging.Here,we propose the concept of frequencysynthesized phase engineering to solve this problem.A phasefront-frequency matrix is properly designed to encode different spatial phases to separate frequencies,thus makes arbitrary dispersion tailoring and even frequency-separated functionalization possible.The periodically rotated director endows cholesteric liquid crystal with a spin and frequency selective reflection.Moreover,via presetting the local initial orientation of liquid crystal,geometric phase is encoded to the reflected light.We verify the proposed strategy by cascading the chiral anisotropic optical media of specifically designed helical pitches and initial director orientations.By this means,planar lenses with RGB achromatic,enhanced chromatic aberration and color routing properties are demonstrated.Inch-sized and high-efficient lenses are fabricated with low crosstalk among colors.It releases the freedom of dispersion control of planar optics,and even enables frequency decoupled phase modulations.This work brings new insights to functional planar optics and may upgrade the performance of existing optical apparatuses.
