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Dynamic nonlocal metasurface for multifunctional integration via phase-change materials.

Shilin Yu1,2,3, Mingfeng Xu1,2,3,4, Mingbo Pu1,2,3,4

  • 1National Key Laboratory of Optical Field Manipulation Science and Technology, Chinese Academy of Sciences, Chengdu 610209, China.

Nanophotonics (Berlin, Germany)
|December 16, 2024
PubMed
Summary

This study introduces a novel phase-change metasurface capable of dynamically controlling light properties. This breakthrough enables multifunctional optical devices with applications in sensing, imaging, and communications.

Keywords:
bound states in the continuumdynamic metalensdynamic nonlocal metasurfaceoptical sensorsphase-change metasurface

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Metasurfaces offer wavefront shaping and sharp spectral resonances using geometric phases at bound states in the continuum (BIC).
  • Static metasurfaces lack the ability to dynamically control multiple degrees of freedom (DOFs), limiting their multifunctional integration and adaptability.

Purpose of the Study:

  • To develop and demonstrate a phase-change metasurface for dynamic manipulation of multiple DOFs, including resonant frequency, Q values, band, and spatial wavefront.
  • To integrate multiple distinct functions into a single metasurface for versatile applications.

Main Methods:

  • Utilized quasi-BIC geometry phase and the phase transition properties of vanadium dioxide (VO2).
  • Engineered a dynamic meta-lens by tailoring spatial light response at quasi-BIC across a temperature range (room temperature to 53°C).
  • Leveraged sharp Fano resonance for optical sensing and VO2's metallic state for broadband absorption.

Main Results:

  • Achieved a dynamic meta-lens with temperature-tunable light response.
  • Demonstrated an optical sensor with a sensitivity of 7.96 THz/RIU in the mid-infrared band.
  • Developed a broadband absorber with >80% absorptivity and 90% average absorption in the mid-infrared spectrum at 80°C.

Conclusions:

  • The proposed phase-change metasurface enables dynamic control over multiple optical properties, paving the way for multifunctional devices.
  • This technology enhances device availability and opens new possibilities for complex scenarios in sensing, imaging, and communications.