Dynamically switchable edge-detection and bright-field imaging based on a phase-change nonlocal metasurface.

Area of Science:

• Optics and Photonics
• Materials Science
• Nanotechnology

Background:

• Optical metasurfaces enable advanced imaging but typically lack dynamic reconfigurability.
• Static functionalities limit practical applications in dynamic environments.
• Reconfigurability is crucial for next-generation optical systems.

Purpose of the Study:

• To demonstrate a reconfigurable optical metasurface with dual imaging capabilities.
• To achieve functional switching within the visible spectrum using phase-change materials.
• To enable dynamic control over optical transfer functions for versatile imaging.

Main Methods:

• Fabrication of an optical metasurface incorporating antimony sulfide (Sb₂S₃).
• Tuning the phase transition (amorphous to crystalline) of Sb₂S₃ to alter optical properties.
• Characterization of imaging performance, including numerical aperture and differentiation capabilities.

Main Results:

• Demonstrated switching between edge detection and bright-field imaging functions.
• Achieved high-performance imaging with a numerical aperture of 0.42.
• Enabled isotropic second-order differentiation and high-resolution imaging via phase transition.

Conclusions:

• The developed metasurface offers dynamic functional switching on a single platform.
• Antimony sulfide phase transition provides a viable mechanism for optical reconfigurability.
• This technology holds promise for advanced applications in medical imaging, sensing, and microscopy.