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Active metasurface modulator with electro-optic polymer using bimodal plasmonic resonance.
Optics Express
|December 10, 2017
Summary
This study presents a novel electro-optic (EO) polymer metasurface modulator. It achieves high-efficiency, high-speed surface-normal modulation using bimodal resonance in metallic gratings.
Area of Science:
- Optoelectronics
- Metamaterials Science
- Nanophotonics
Background:
- Electrically tunable metasurfaces enable ultrathin surface-normal modulators.
- Electro-optic (EO) polymers offer potential for efficient modulation.
Purpose of the Study:
- To demonstrate a novel metasurface modulator with enhanced modulation efficiency.
- To utilize bimodal resonance in a metallic subwavelength grating for improved performance.
Main Methods:
- Fabrication of a metasurface modulator using EO polymer and metallic subwavelength gratings.
- Excitation of coupled metal-insulator-metal (MIM) resonant modes.
- Characterization of modulation efficiency and performance under applied voltage.
Main Results:
- Achieved efficient intensity modulation with a 15-dB extinction ratio.
- Observed efficient modulation with a small refractive index change (8.5 × 10-3) and low voltage (<10 V).
- Predicted RC bandwidth exceeding 100 GHz due to device design.
Conclusions:
- The developed metasurface modulator demonstrates high efficiency and potential for high-speed operation.
- Bimodal resonance in metallic gratings is an effective strategy for enhancing EO modulation.
- The device is suitable for high-speed surface-normal modulation applications.
