One-dimensional photonic crystal enhancing spin-to-orbital angular momentum conversion for single-particle tracking  

作　　者：Mingchuan Huang Qiankun Chen Yang Liu Chi Zhang Rongjin Zhang Junhua Yuan Douguo Zhang 

机构地区：[1]Advanced Laser Technology Laboratory of Anhui Province,Department of Optics and Optical Engineering,University of Science and Technology of China,Hefei,Anhui,China [2]Department of Physics,University of Science and Technology of China,Hefei,Anhui,China [3]Hefei National Research Center for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei,Anhui,China [4]Hefei National Laboratory,University of Science and Technology of China,Hefei,China

出　　处：《Light(Science & Applications)》2024年第11期2767-2780,共14页光（科学与应用)（英文版）

基　　金：supported by the National Key Research and Development Program of China(2021YFA1400700);the National Nature Science Foundation of China(grant nos.12134013,62127818,11925406 and 12090053);the Key Research&Development Program of Anhui Province(202104a05020010);the Fundamental Research Funds for the Central Universities(WK2340000109);the Inovation Program for Quantum Science and Technology(No.2021ZD0303301);D.G.Zhang is supported by a USTC Tang Scholarship.

摘　　要：Single-particle tracking(SPT)is an immensely valuable technique for studying a variety of processes in the life sciences and physics.It can help researchers better understand the positions,paths,and interactions of single objects in systems that are highly dynamic or require imaging over an extended time.Here,we propose an all-dielectric onedimensional photonic crystal(1D PC)that enhances spin-to-orbital angular momentum conversion for threedimensional(3D)SPTs.This well-designed 1D PC can work as a substrate for optical microscopy.We introduce this effect into the interferometric scattering(iSCAT)technique,resulting in a double-helix point spread function(DH-PSF).DH-PSF provides more uniform Fisher information for 3D position estimation than the PSFs of conventional microscopy,such as encoding the axial position of a single particle in the angular orientation of DH-PSF lobes,thus providing a means for 3D SPT.This approach can address the challenge of iSCAT in 3D SPT because DH-PSF iSCAT will not experience multiple contrast inversions when a single particle travels along the axial direction.DH-PSF iSCAT microscopy was used to record the 3D trajectory of a single microbead attached to the flagellum,facilitating precise analysis of fluctuations in motor dynamics.Its ability to track single nanoparticles,such as 3D diffusion trajectories of 20 nm gold nanoparticles in glycerol solution,was also demonstrated.The DH-PSF iSCAT technique enabled by a 1D PC holds potential promise for future applications in physical,biological,and chemical science.

关 键 词：ANGULAR PARTICLE MOMENTUM 

分 类 号：O572.2[理学—粒子物理与原子核物理]