Opto-Electronic Advances, Volume. 7, Issue 2, 230171-1(2024)

Miniature tunable Airy beam optical meta-device

Jing Cheng Zhang1,†... Mu Ku Chen1,2,3,†, Yubin Fan1,†, Qinmiao Chen4,†, Shufan Chen1, Jin Yao1, Xiaoyuan Liu1, Shumin Xiao4,*, and Din Ping Tsai1,23,** |Show fewer author(s)
Author Affiliations
  • 1Department of Electrical Engineering, City University of Hong Kong, Kowloon, Hong Kong SAR 999077, China
  • 2State Key Laboratory of Terahertz and Millimeter Waves, City University of Hong Kong, Kowloon, Hong Kong SAR 999077, China
  • 3Centre for Biosystems, Neuroscience, and Nanotechnology, City University of Hong Kong, Kowloon, Hong Kong SAR 999077, China
  • 4Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems, Harbin Institute of Technology, Shenzhen 518055, China
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    Figures & Tables(4)
    Schematic of all-dielectric meta-device for generating dynamic Airy beam.
    Characteristic of the meta-device. (a) The optical characteristics of the nanoantenna. The phase can encompass a complete 2π cycle as the diameter transitions from 50 nm to 113 nm, achieving an efficiency exceeding 90% for all the selected nanoantennas. The inset depicts the schematic of the nanoantenna. (b, e) The phase profiles of the first (b) and the second (e) metasurface. (c, f) The optical images of the fabricated metasurfaces according to the phase profile in (b) and (e), respectively. (d, g) The measured phase profiles of the fabricated metasurfaces. Scalar bars: 200 µm. The phase profile is measured using MetronLens from Ideaoptics Co., Ltd, Shanghai. (h) Scanning electron microscope (SEM) images of the meta-device. Scale bar: 100 μm. (i) Tiled-view (blue square) zoomed-in SEM image of meta-atoms of the metasurface. Scale bar: 0.5 μm.
    The simulated and experimental results of the meta-devices. (a) The phase obtained upon the superposition of the two metasurfaces when the rotation angles of the two metasurfaces are both zero. (b) The simulated results when the rotation angle is set as shown in (a). The left column shows the Airy beam intensity in the propagation direction, and the dashed line shows the focal plane. The intensity distribution of the focal plane is shown in the upper right. The lower right shows the intensity distribution of the line that crosses the focal spot indicated by the dashed line in the upper right. (c) The experimental results according to those shown in (b). (d) The phase obtained upon superposition of the two metasurfaces when the rotation angles are -π/2 and π/2, respectively. (e) The simulated results when the rotation angle is set as shown in (d). The left column shows the Airy beam intensity in the propagation direction, and the dashed line shows the focal plane. The intensity distribution of the focal plane is shown in the upper right. The Lower right shows the intensity distribution of the line that crosses the focal spot indicated by the dashed line in the upper right. (f) The experimental results according to those shown in (b).
    The experimental results of the meta-devices. (a) Different focal spots of the Airy beam when varying the rotation angles of the metasurfaces. The theoretically achievable zone is marked between the two dotted circles. (b) The intensity distributions of the focal plane selected from Fig. 4(a) are indicated by squares of different colors. Scalar bar: 20 µm.
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    Jing Cheng Zhang, Mu Ku Chen, Yubin Fan, Qinmiao Chen, Shufan Chen, Jin Yao, Xiaoyuan Liu, Shumin Xiao, Din Ping Tsai. Miniature tunable Airy beam optical meta-device[J]. Opto-Electronic Advances, 2024, 7(2): 230171-1

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    Paper Information

    Category: Research Articles

    Received: Sep. 21, 2023

    Accepted: Nov. 15, 2023

    Published Online: May. 24, 2024

    The Author Email: Xiao Shumin (SMXiao), Tsai Din Ping (DPTsai)

    DOI:10.29026/oea.2024.230171

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