An optical vortex beam has attracted significant attention across diverse applications,including optical manipulation,phase-contrast microscopy,optical communication,and quantum photonics.To utilize vortex generators ...An optical vortex beam has attracted significant attention across diverse applications,including optical manipulation,phase-contrast microscopy,optical communication,and quantum photonics.To utilize vortex generators for integrated photonics,researchers have developed ultra-compact vortex generators using fork gratings,metasurfaces,and integrated microcombs.However,those devices depend on costly,time-consuming nanofabrication and are constrained by the low signal-to-noise ratio due to the fabrication error.As an alternative maneuver,spin-orbit coupling has emerged as a method to obtain the vortex beam by converting spin angular momentum(SAM)without nanostructures.Here,we demonstrate the creation of an optical vortex beam using van der Waals(vdW)materials.The significantly high birefringence of vdW materials allows the generation of optical vortex beams,even with materials of sub-wavelength thickness.In this work,we utilize an 8µm-thick hexagonal boron nitride(hBN)crystal for the creation of optical vortices carrying topological charges of±2.We also present the generation of an optical vortex beam in a 320 nm-thick MoS_(2) crystal with a conversion efficiency of 0.09.This study paves the way for fabrication-less and ultracompact optical vortex generators,which can be applied for integrated photonics and large-scale vortex generator arrays.展开更多
基金supported by the National Research Foundation of Korea(NRF)grant funded by the Korean government(MSIT)(RS-2024-00338048)(RS-2024-00414119)also supported by the Republic of Korea’s MSIT,under the Global Research Support Program in the Digital Field program)(RS-2024-00412644)+2 种基金supervised by the IITP(Institute of Information and Communications Technology Planning&Evaluation)and also supported by Culture,Sports and Tourism R&D Program through the Korea Creative Content Agency grant funded by the Ministry of Culture,Sports and Tourism in 2024(RS-2024-00332210)also Artificial Intelligence Graduate School Program(No.RS-2020-II201373,Hanyang University)supervised by the IITP,and under the artificial intelligence semiconductor support program to nurture the best talents(IITP-(2025)-RS-2023-00253914)grant funded by the Korea government,and by the MSIT(RS-2023-00261368,RS-2025-02218723,RS-2025-02283217).
文摘An optical vortex beam has attracted significant attention across diverse applications,including optical manipulation,phase-contrast microscopy,optical communication,and quantum photonics.To utilize vortex generators for integrated photonics,researchers have developed ultra-compact vortex generators using fork gratings,metasurfaces,and integrated microcombs.However,those devices depend on costly,time-consuming nanofabrication and are constrained by the low signal-to-noise ratio due to the fabrication error.As an alternative maneuver,spin-orbit coupling has emerged as a method to obtain the vortex beam by converting spin angular momentum(SAM)without nanostructures.Here,we demonstrate the creation of an optical vortex beam using van der Waals(vdW)materials.The significantly high birefringence of vdW materials allows the generation of optical vortex beams,even with materials of sub-wavelength thickness.In this work,we utilize an 8µm-thick hexagonal boron nitride(hBN)crystal for the creation of optical vortices carrying topological charges of±2.We also present the generation of an optical vortex beam in a 320 nm-thick MoS_(2) crystal with a conversion efficiency of 0.09.This study paves the way for fabrication-less and ultracompact optical vortex generators,which can be applied for integrated photonics and large-scale vortex generator arrays.
