Beam switching and bifocal zoom lensing using active plasmonic metasurfaces

Area of Science:

• Nanophotonics
• Metasurfaces
• Phase-change materials

Background:

• Compact, adaptable nanophotonic elements are crucial for miniaturizing optical technologies like adaptive optics and spatial light modulators.
• Microscopic active optical components often face limitations due to mechanical actuation, making alternative solutions necessary.

Purpose of the Study:

• To present a novel design for highly integrated active optical components.
• To demonstrate the capabilities of this new design for optical applications.

Main Methods:

• Utilizing a combination of resonant plasmonic metasurfaces.
• Incorporating the phase-change material Germanium-Antimony-Telluride (Ge₃Sb₂Te₆).

Main Results:

• Demonstrated beam switching capabilities.
• Achieved bifocal lensing functionality.
• Validated the design principles for active optical elements.

Conclusions:

• The proposed design offers a pathway for creating miniaturized, active optical components.
• This approach paves the way for a wide range of active optical elements based on plasmonic metasurfaces.
• The integration of phase-change materials with metasurfaces enables adaptable optical functionalities.