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Electrically Modulated Gap Interference for Tunable Plasmonic Metasurfaces
Xinyu Wen1,2,3,4, Hongquan Yu2,3,4, Jinghui Gao1,2,3
1State Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China.
Nano Letters
|April 17, 2026
Summary
Researchers developed electrically tunable plasmonic metasurfaces. These devices offer continuous wavelength modulation using low voltages, enabling dynamic control for advanced nanophotonic applications.
Area of Science:
- Nanophotonics
- Metamaterials
- Plasmonics
Background:
- Plasmonic metasurfaces offer nanoscale optical field control but typically have fixed properties post-fabrication.
- This limitation restricts their application in dynamic optical systems.
Purpose of the Study:
- To demonstrate electrically modulated plasmonic metasurfaces for tunable wavelength applications.
- To achieve continuous and reversible optical modulation using low voltages.
Main Methods:
- Fabrication of metasurfaces using silver nanoparticle lattices and gold electrodes on ITO/quartz.
- Integration with an air gap or polystyrene microspheres for modulation.
- Application of CMOS-compatible voltages (below 5 V) to induce thermal stress and modulate surface lattice resonance via an interference mode.
Main Results:
- Achieved continuous and reversible wavelength modulation.
- Demonstrated tuning sensitivities of approximately 0.5 nm/V.
- Obtained modulation rates up to 10 Hz.
- Utilized thermal stress from voltage application to alter air gap thickness and shift resonance wavelength.
Conclusions:
- Electrically modulated plasmonic metasurfaces enable dynamic wavelength control.
- The demonstrated technology offers potential for tunable nanophotonic devices.
- Applications include optical imaging, displays, and communications.
