Phyllotaxis-inspired nanosieves with multiplexed orbital angular momentum

eLight - Tập 1 - Trang 1-11 - 2021
Zhongwei Jin1,2, David Janoschka3, Junhong Deng4, Lin Ge5, Pascal Dreher3, Bettina Frank6, Guangwei Hu1, Jincheng Ni1, Yuanjie Yang7, Jing Li8, Changyuan Yu1,9, Dangyuan Lei10, Guixin Li4, Shumin Xiao11, Shengtao Mei1, Harald Giessen6, Frank Meyer zu Heringdorf3, Cheng-Wei Qiu1
1Department of Electrical and Computer Engineering, National University of Singapore, Singapore, Singapore
2College of Optical and Electronic Technology, China Jiliang University, Hangzhou, China
3Faculty of Physics and Center for Nanointegration Duisburg–Essen (CENIDE), University of Duisburg–Essen, Duisburg, Germany
4Department of Materials Science and Engineering, Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen, China
5Beijing Qianjunyide Technology Co. Ltd, Beijing, China
6Physics Institute and Stuttgart Center of Photonics Engineering (SCoPE), University of Stuttgart, Stuttgart, Germany
7School of Physics, University of Electronic Science and Technology of China, Chengdu, China
8Key Laboratory of Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, China
9Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Hong Kong SAR, China
10Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong SAR, China
11State Key Laboratory On Tunable Laser Technology, Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, China

Tóm tắt

Nanophotonic platforms such as metasurfaces, achieving arbitrary phase profiles within ultrathin thickness, emerge as miniaturized, ultracompact and kaleidoscopic optical vortex generators. However, it is often required to segment or interleave independent sub-array metasurfaces to multiplex optical vortices in a single nano-device, which in turn affects the device’s compactness and channel capacity. Here, inspired by phyllotaxis patterns in pine cones and sunflowers, we theoretically prove and experimentally report that multiple optical vortices can be produced in a single compact phyllotaxis nanosieve, both in free space and on a chip, where one meta-atom may contribute to many vortices simultaneously. The time-resolved dynamics of on-chip interference wavefronts between multiple plasmonic vortices was revealed by ultrafast time-resolved photoemission electron microscopy. Our nature-inspired optical vortex generator would facilitate various vortex-related optical applications, including structured wavefront shaping, free-space and plasmonic vortices, and high-capacity information metaphotonics.

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