Broadband angular momentum cascade via a multifocal graphene vortex generator  

作　　者：Zhongwei Jin Guiyuan Cao Hongtao Wang Han Lin Baohua Jia Cheng-Wei Qiu 金中薇;曹桂源;王洪涛;林翰;贾宝华;仇成伟(College of Optical and Electronic Technology,China Jiliang University,Hangzhou 310018,China;Department of Electrical and Computer Engineering,National University of Singapore,Singapore 117583,Singapore;Centre of Translational Atomaterials(CTAM),Faculty of Science,Engineering and Technology,Swinburne University of Technology,Hawthorn,VIC 3122,Australia;School of Science,RMIT University,Melbourne,VIC 3000,Australia;The Australian Research Council(ARC)Industrial Transformation Training Centre in Surface Engineering for Advanced Materials(SEAM),Swinburne University of Technology,Hawthorn,VIC 3122,Australia)

机构地区：[1]College of Optical and Electronic Technology,China Jiliang University,Hangzhou 310018,China [2]Department of Electrical and Computer Engineering,National University of Singapore,Singapore 117583,Singapore [3]Centre of Translational Atomaterials(CTAM),Faculty of Science,Engineering and Technology,Swinburne University of Technology,Hawthorn,VIC 3122,Australia [4]School of Science,RMIT University,Melbourne,VIC 3000,Australia [5]The Australian Research Council(ARC)Industrial Transformation Training Centre in Surface Engineering for Advanced Materials(SEAM),Swinburne University of Technology,Hawthorn,VIC 3122,Australia

出　　处：《Chinese Optics Letters》2022年第10期91-95,共5页中国光学快报（英文版）

基　　金：the support from Advanced Research and Technology Innovation Centre(ARTIC)in National University of Singapore(R-261-518-004-720|A-0005947-1600);the Australia Research Council through the Discovery Project Scheme(DP190103186,DP220100603,and FT210100806);the Industrial Transformation Training Centre Scheme(IC180100005).

摘　　要：Light beams carrying orbital angular momentum(OAM)have inspired various advanced applications,and such abundant practical applications in turn demand complex generation and manipulation of optical vortices.Here,we propose a multifocal graphene vortex generator,which can produce broadband angular momentum cascade containing continuous integer non-diffracting vortex modes.Our device naturally embodies a continuous spiral slit vortex generator and a zone plate,which enables the generation of high-quality continuous vortex modes with deep depths of foci.Meanwhile,the generated vortex modes can be simultaneously tuned through incident wavelength and position of the focal plane.The elegant structure of the device largely improves the design efficiency and can be fabricated by laser nanofabrication in a single step.Moreover,the outstanding property of graphene may enable new possibilities in enormous practical applications,even in some harsh environments,such as aerospace.

关 键 词：optical vortex multifocus BROADBAND wavelength tunability GRAPHENE 

分 类 号：O43[机械工程—光学工程]