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Overcoming Barriers to Dynamic Phase-Only Modulation in Transmissive Metasurfaces via Diffraction Control.
Juyoung Kim1,2, Ruzan Sokhoyan2, Minkyoon Yi1
1Department of Electrical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, South Korea.
ACS Nano
|February 11, 2026
Summary
Researchers developed new transmissive metasurfaces for dynamic wavefront control. This breakthrough enables continuous 0-360° phase tuning with constant transmission, overcoming previous limitations in active photonic systems.
Area of Science:
- Photonics and optical engineering
- Metamaterials and nanophotonics
Background:
- Active photonic systems utilize metasurfaces for dynamic wavefront control.
- Transmissive metasurfaces are crucial for integrated photonic systems but face limitations in phase control (0-180°).
- Existing designs are often reflective, limiting applications.
Purpose of the Study:
- To overcome the limitations of single-resonance transmissive metasurfaces.
- To achieve continuous 0-360° phase tuning with constant transmission amplitude.
- To enable dynamic phase control in compact, integrated photonic systems.
Main Methods:
- Introduced additional diffraction ports in reflection while maintaining a single transmission port.
- Utilized temporal coupled-mode theory for analytical demonstration.
- Validated the approach with proof-of-concept active metasurfaces using lithium niobate, germanium, and silicon resonators.
Main Results:
- Demonstrated continuous 0-360° phase tuning in transmission without a transmission null.
- Achieved spectrally flat transmission amplitude across the entire phase range, similar to multiresonant systems.
- Simulated metasurfaces showed tunable phase shifts of ~250° and ~300° with near-ideal transmission amplitude (~0.45 and ~0.4).
Conclusions:
- The novel design enables compact, dynamically tunable transmissive metasurfaces with near-ideal phase and amplitude characteristics.
- This approach overcomes fundamental constraints of single-resonance transmissive architectures.
- Paves the way for advanced integrated and reconfigurable photonic systems.
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