In view of wide applications of structured light fields and plasmonic vortices,we propose the concept of compound plasmonic vortex and design several structured plasmonic vortex generators.This kind of structured plas...In view of wide applications of structured light fields and plasmonic vortices,we propose the concept of compound plasmonic vortex and design several structured plasmonic vortex generators.This kind of structured plasmonic vortex generators consists of multiple spiral nanoslits and they can generate two or more concentric plasmonic vortices.Different from Laguerre-Gaussian beam,the topological charge of the plasmonic vortex in different region is different.Theoretical analysis lays the basis for the design of radially structured plasmonic vortex generators and numerical simulations for several examples confirm the effectiveness of the design principle.The discussions about the interference of vortex fields definite the generation condition for the structured vortex.This work provides a design methodology for generating new vortices using spiral nanoslits and the advanced radially structured plasmonic vortices is helpful for broadening the applications of vortex fields.展开更多
Highly customized and miniaturized structured light is expected in many application fields.A kind of structured vortex generators is proposed based on a metasurface consisting of rectangular nanoholes etched in a silv...Highly customized and miniaturized structured light is expected in many application fields.A kind of structured vortex generators is proposed based on a metasurface consisting of rectangular nanoholes etched in a silver film,and the generated vortices with the same or different topological charges are distributed along the radial direction.The geometric metasurface is completed with the help of optical holography technology,and the structured vortex generator possesses high working efficiency and large information capacity.The proposed vortex generators work under circularly polarized light illumination,and the reproduced vortices of multiplexing vortex generator depend on the handedness of the circularly polarized light.This work paves a way to generate new structured light fields.The radially distributed vortices may be utilized to simultaneously screen or separate microparticles.The compact design of the structured vortex generator and the convenient switch of different structured vortices will be a benefit to expand the applications of structured vortex fields.展开更多
基金the National Natural Science Foundation of China(NSFC)(Grant Nos.10874105 and 11704231).
文摘In view of wide applications of structured light fields and plasmonic vortices,we propose the concept of compound plasmonic vortex and design several structured plasmonic vortex generators.This kind of structured plasmonic vortex generators consists of multiple spiral nanoslits and they can generate two or more concentric plasmonic vortices.Different from Laguerre-Gaussian beam,the topological charge of the plasmonic vortex in different region is different.Theoretical analysis lays the basis for the design of radially structured plasmonic vortex generators and numerical simulations for several examples confirm the effectiveness of the design principle.The discussions about the interference of vortex fields definite the generation condition for the structured vortex.This work provides a design methodology for generating new vortices using spiral nanoslits and the advanced radially structured plasmonic vortices is helpful for broadening the applications of vortex fields.
基金Natural Science Foundation of Shandong Province(ZR2020KA009)National Natural Science Foundation of China(10874105).
文摘Highly customized and miniaturized structured light is expected in many application fields.A kind of structured vortex generators is proposed based on a metasurface consisting of rectangular nanoholes etched in a silver film,and the generated vortices with the same or different topological charges are distributed along the radial direction.The geometric metasurface is completed with the help of optical holography technology,and the structured vortex generator possesses high working efficiency and large information capacity.The proposed vortex generators work under circularly polarized light illumination,and the reproduced vortices of multiplexing vortex generator depend on the handedness of the circularly polarized light.This work paves a way to generate new structured light fields.The radially distributed vortices may be utilized to simultaneously screen or separate microparticles.The compact design of the structured vortex generator and the convenient switch of different structured vortices will be a benefit to expand the applications of structured vortex fields.
