Functionality multiplexing in high-efficiency metasurfaces based on coherent wave interferences

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外文摘要：Multiplexing multiple yet distinct functionalities in one single device is highly desired for modern integration optics,but conventional devices are usually of bulky sizes and/or low efficiencies.While recently proposed metasurfaces can be ul-tra-thin and highly efficient,functionalities multiplexed by metadevices so far are typically restricted to two,dictated by the number of independent polarization states of the incident light.Here,we propose a generic approach to design metade-vices exhibiting wave-control functionalities far exceeding two,based on coherent wave interferences continuously tuned by varying the incident polarization.After designing a series of building-block metaatoms with optical properties experi-mentally characterized,we construct two metadevices based on the proposed strategy and experimentally demonstrate their polarization-tuned multifunctionalities at the wavelength of 1550 nm.Specifically,upon continuously modulating the incident polarization along different paths on the Poincare's sphere,we show that the first device can generate two spa-tially non-overlapping vortex beams with strengths continuously tuned,while the second device can generate a vectorial vortex beam carrying continuously-tuned polarization distribution and/or orbital angular momentum.Our proposed strate-gy significantly expands the wave-control functionalities equipped with a single optical device,which may stimulate nu-merous applications in integration optics.

外文关键词：

metasurfacecoherent wave interferencesvectorial vortex beamfunctionality multiplexingorbital angular momentumlocal polarization distributionspolarization-dependent

作者：

Yuejiao Zhou、Tong Liu、Changhong Dai、Dongyi Wang、Lei Zhou

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作者单位：

State Key Laboratory of Surface Physics,Key Laboratory of Micro and Nano Photonic Structures(Ministry of Education),Shanghai Key Laboratory of Metasurfaces for Light Manipulation and Department of Physics,Fudan University,Shanghai 200438,China

Department of Physics,The Hong Kong University of Science and Technology,Clear Water Bay,Kowloon,Hong Kong 999077,China

Department of Physics,Hong Kong Baptist University,Kowloon Tong,Hong Kong 999077,China

Collaborative Innovation Centre of Advanced Microstructures,Nanjing 210093,China

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出版年：

2024

DOI：

10.29026/oea.2024.240086

光电进展(英文版)

ISSN：

年,卷(期)：2024.7(11)