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Dynamic circular birefringence response with fractured geometric phase metasurface systems
Evan W Wang1, Thaibao Phan1, Shang-Jie Yu1
1Department of Electrical Engineering, Stanford University, Stanford, CA 94305.
Summary
We developed novel fractured metasurface systems that dynamically control light polarization. This breakthrough enables reconfigurable optical activity and fast modulation of circular birefringence for advanced nanophotonics.
Area of Science:
- Nanophotonics
- Metamaterials
- Optical Engineering
Background:
- Controlling symmetry breaking in electromagnetic systems is key to tailoring optical activity.
- Geometric phase metasurfaces offer a route to manipulate light polarization.
Purpose of the Study:
- To introduce and demonstrate fractured Pancharatnam–Berry-phase metasurface systems for dynamic control of optical properties.
- To achieve arbitrary and reconfigurable broadband circular birefringence response.
Main Methods:
- Fracturing a full-waveplate metasurface into two half-waveplate metasurfaces.
- Actively configuring metasurfaces using shear displacement to induce relative rotations.
- Applying the concept to pairs of periodic Pancharatnam–Berry-phase metasurfaces.
Main Results:
- Demonstrated arbitrary and reconfigurable broadband circular birefringence.
- Achieved high-speed circular birefringence modulation with modest shearing speeds.
- Showcased dynamic control over polarization states.
Conclusions:
- Fractured geometric phase metasurface systems provide a versatile nanophotonic platform.
- Systems-level symmetry breaking enables active electromagnetic wave control.
- This approach facilitates fast temporal responses for polarization manipulation.
