Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Design of Dynamically Focus-switchable Fresnel Zone Plates Based on Plasmonic Phase-change VO2 Metafilm Absorbers

  • Kyuho Kim (Inter-University Semiconductor Research Center, School of Electrical and Computer Engineering, Seoul National University) ;
  • Changhyun Kim (Inter-University Semiconductor Research Center, School of Electrical and Computer Engineering, Seoul National University) ;
  • Sun-Je Kim (Department of Physics, Myongji University) ;
  • Byoungho Lee (Inter-University Semiconductor Research Center, School of Electrical and Computer Engineering, Seoul National University)
  • Received : 2023.03.06
  • Accepted : 2023.05.29
  • Published : 2023.06.25
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Abstract

Novel thermo-optically focus-switchable Fresnel zone plates based on phase-change metafilms are designed and analyzed at a visible wavelength (660 nm). By virtue of the large thermo-optic response of vanadium dioxide (VO2) thin film, a phase-change material, four different plasmonic phase-change absorbers are numerically designed as actively tunable Gires-Tournois Al-VO2 metafilms in two and three dimensions. The designed phase-change metafilm unit cells are used as the building blocks of actively focus-switchable Fresnel zone plates with strong focus switching contrast (40%, 83%) and high numerical apertures (1.52, 1.70). The Fresnel zone plates designed in two and three dimensions work as cylindrical and spherical lenses in reflection type, respectively. The coupling between the thermo-optic effect of VO2 and localized plasmonic resonances in the Al nanostructures offer a large degree of freedom in design and high-contrast focus-switching performance based on largely tunable absorption resonances. The proposed method may have great potential in photothermal and electrothermal active optical devices for nonlinear optics, microscopy, 3D scanning, optical trapping, and holographic displays over a wide spectral range including the visible and infrared regimes.

Keywords

Acknowledgement

This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. 2021R1F1A1062368). This work was also supported by the 2022 Research Fund of Myongji University.

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