Generation of super-resolved optical needle and multifocal array using graphene oxide metalenses  

作　　者：Hongtao Wang Chenglong Hao Han Lin Yongtian Wang Tian Lan Chengwei Qiu Baohua Jia 

机构地区：[1]Centre for Translational Atomaterials,Faculty of Science,Engineering and Technology,Swinburne University of Technology,P.O.Box 218,Hawthorn VIC 3122,Australia [2]Key Laboratory of Photoelectronic Imaging Technology and System,Ministry of Education of China,School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China [3]Department of Electrical and Computer Engineering,National University of Singapore,4 Engineering Drive 3,Singapore 117583,Singapore [4]Engineering Product Development Pillar,Singapore University of Technology and Design,8 Somapah Road,487372,Singapore

出　　处：《Opto-Electronic Advances》2021年第2期1-11,共11页光电进展（英文）

基　　金：Hongtao Wang acknowledges the support from National Key Research and Development Program of China(2017YFB0403602);China Scholarship Council.Baohua Jia acknowledges the support from the Australian Research Council through the Discovery Projects(DP150102972,DP190103186);the Industrial Transformation Training Centres scheme(Grant No.IC180100005);support from Defence Science Institute(DSI)and Defence Science and Technology Group(DSTG).C.W.Q.acknowledges the support from the National Research Foundation,Prime Minister’s Office,Singapore,under its Competitive Research Programme(CRP award NRF CRP22-2019-0006);Advanced Research and Technology Innovation Centre(ARTIC)under the grant(R-261-518-004-720);A STAR under Advanced Manufacturing and Engineering(AME)Individual Research Grant(IRG A2083c0060);Tian Lan acknowledges National Key Basic Research Program 973 Project(2013CB329202);National Major Scientific Instruments and Equipments Development Project supported by National Natural Science Foundation of China(No.61827814).

摘　　要：Ultrathin flat metalenses have emerged as promising alternatives to conventional diffractive lenses,offering new possibilities for myriads of miniaturization and interfacial applications.Graphene-based materials can achieve both phase and amplitude modulations simultaneously at a single position due to the modification of the complex refractive index and thickness by laser conversion from graphene oxide into graphene like materials.In this work,we develop graphene oxide metalenses to precisely control phase and amplitude modulations and to achieve a holistic and systematic lens design based on a graphene-based material system.We experimentally validate our strategies via demonstrations of two graphene oxide metalenses:one with an ultra-long(~16λ)optical needle,and the other with axial multifocal spots,at the wavelength of 632.8 nm with a 200 nm thin film.Our proposed graphene oxide metalenses unfold unprecedented opportunities for accurately designing graphene-based ultrathin integratable devices for broad applications.

关 键 词：femtosecond laser reduction graphene oxide metalens multifocal spots optical needle 

分 类 号：TH74[机械工程—光学工程]