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Opto-Electronic Advances, Volume. 6, Issue 7, 220073(2023)

All-optical controlled-NOT logic gate achieving directional asymmetric transmission based on metasurface doublet

Yijia Huang1,†... Tianxiao Xiao2,†, Shuai Chen4, Zhengwei Xie1, Jie Zheng1, Jianqi Zhu1, Yarong Su1, Weidong Chen1, Ke Liu1, Mingjun Tang1, Peter Müller-Buschbaum2,3,* and Ling Li1,* |Show fewer author(s)
Author Affiliations
  • 1Laboratory of Micro-Nano Optics, College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu 610101, China
  • 2Physik-Department, Lehrstuhl für Funktionelle Materialien, Technische Universität München, James-Franck-Straße 1, 85748, Garching, Germany
  • 3Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Lichtenbergstraße. 1, 85748, Garching, Germany
  • 4Tianjin Huahuixin Technology Group Co., Ltd, Zhongtian Avenue, Tianjin 300467, China
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    Schematic for the proposed all-optical CNOT LG. (a–d) Far-field responses under different incident conditions that correspond to (a) no focus, (b) two foci, (c) one focus with small focal distance and (d) one focus with large focal distance. The corresponding truth-table is shown in the inset with spin state as CS and incident direction as TS, which is perfectly matched with that in Eq. (2).

    Fig. 1. Schematic for the proposed all-optical CNOT LG. (a–d) Far-field responses under different incident conditions that correspond to (a) no focus, (b) two foci, (c) one focus with small focal distance and (d) one focus with large focal distance. The corresponding truth-table is shown in the inset with spin state as CS and incident direction as TS, which is perfectly matched with that in Eq. (2).

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    Unit cells for the CNOT LG metasurface doublet. (a,e) Schematic for HHWP and LHWP unit cells, respectively.P=4.5 μm, h=6 μm, l1=3.7 μm, w1=1.2 μm, l2=2.9 μm and w2=2.05 μm. (b, f) Corresponding polarization conversion ratio (left panel) and phase delay (right panel) with different φ for cross-polarized waves at 28.3 THz under LCP incidence. (c, g) Corresponding transmittance at φ=0 (solid lines) andφ=π/4 (dashed lines) from 27–29 THz. (d, h) Corresponding magnetic field distributions at –28.3 THz.

    Fig. 2. Unit cells for the CNOT LG metasurface doublet. (a,e) Schematic for HHWP and LHWP unit cells, respectively.P=4.5 μm, h=6 μm, l1=3.7 μm, w1=1.2 μm, l2=2.9 μm and w2=2.05 μm. (b, f) Corresponding polarization conversion ratio (left panel) and phase delay (right panel) with different φ for cross-polarized waves at 28.3 THz under LCP incidence. (c, g) Corresponding transmittance at φ=0 (solid lines) andφ=π/4 (dashed lines) from 27–29 THz. (d, h) Corresponding magnetic field distributions at –28.3 THz.

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    Numerical far-field results in x-z plane under different incident conditions. (a) Front RCP incidence. (b) Front LCP incidence. (c) Back RCP incidence. (d) Back LCP incidence. The insets show the 2D normalized intensity distributions at z=18 mm (white dashed lines) and 27 mm (blue dashed lines). When a focal spot can be observed at certain focal plane, the corresponding truth table is “1”, otherwise the truth table is “0”.

    Fig. 3. Numerical far-field results in x-z plane under different incident conditions. (a) Front RCP incidence. (b) Front LCP incidence. (c) Back RCP incidence. (d) Back LCP incidence. The insets show the 2D normalized intensity distributions at z=18 mm (white dashed lines) and 27 mm (blue dashed lines). When a focal spot can be observed at certain focal plane, the corresponding truth table is “1”, otherwise the truth table is “0”.

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    Experiment for the asymmetric transmission metasurface doublet. (a) SEM images for the front (left) and back (right) side of the metasurface. (b) Schematic illustration of the measurement setup. LP: linear polarizer. λ/4: quarter wave plate. BE: beam expander. SA: sample. (c–f) Intensity distributions at z=18 mm and 27 mm. (c) Front RCP incidence. (d) Front LCP incidence. (e) Back RCP incidence. (f) Back LCP incidence.

    Fig. 4. Experiment for the asymmetric transmission metasurface doublet. (a) SEM images for the front (left) and back (right) side of the metasurface. (b) Schematic illustration of the measurement setup. LP: linear polarizer. λ/4: quarter wave plate. BE: beam expander. SA: sample. (c–f) Intensity distributions at z=18 mm and 27 mm. (c) Front RCP incidence. (d) Front LCP incidence. (e) Back RCP incidence. (f) Back LCP incidence.

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    Demonstration of the directional Janus metasurface for orthogonal polarizations. (a) Schematic flow chart of the design process. FFT: fast Fourier transformation. IFFT: inverse fast Fourier transformation. (b–e) Calculated and measured far-field images at the same image plane under different incident conditions. (b) Front RCP incidence. (c) Front LCP incidence. (d) Back RCP incidence. (e) Back LCP incidence.

    Fig. 5. Demonstration of the directional Janus metasurface for orthogonal polarizations. (a) Schematic flow chart of the design process. FFT: fast Fourier transformation. IFFT: inverse fast Fourier transformation. (b–e) Calculated and measured far-field images at the same image plane under different incident conditions. (b) Front RCP incidence. (c) Front LCP incidence. (d) Back RCP incidence. (e) Back LCP incidence.

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    Yijia Huang, Tianxiao Xiao, Shuai Chen, Zhengwei Xie, Jie Zheng, Jianqi Zhu, Yarong Su, Weidong Chen, Ke Liu, Mingjun Tang, Peter Müller-Buschbaum, Ling Li. All-optical controlled-NOT logic gate achieving directional asymmetric transmission based on metasurface doublet[J]. Opto-Electronic Advances, 2023, 6(7): 220073

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    Paper Information

    Category: Research Articles

    Received: Apr. 15, 2022

    Accepted: Jul. 13, 2022

    Published Online: Sep. 25, 2023

    The Author Email:

    DOI:10.29026/oea.2023.220073

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology