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Electrically tunable metasurface for dual-band spatial light modulation using the epsilon-near-zero effect
Optics Letters
|October 1, 2022
Summary
This study introduces a novel dual-band metasurface for active light control in telecommunication wavelengths. The device utilizes an epsilon-near-zero effect for efficient spatial light modulation at C-band and O-band.
Area of Science:
- Nanophotonics
- Metasurface Engineering
- Optical Modulation
Background:
- Metasurfaces offer nanoscale control of light.
- Active control of light is crucial for nanophotonic devices.
- Dual-band operation is desirable for telecommunications.
Purpose of the Study:
- To report a grating-assisted dual-band metasurface for spatial light modulation.
- To demonstrate active control in both C-band and O-band telecommunication wavelengths.
Main Methods:
- Fabrication of a silicon-nitride nanograting on an ITO-based stack.
- Utilizing effective medium theory and modal analysis.
- Leveraging the epsilon-near-zero (ENZ) effect of ITO for tunable loss.
Main Results:
- Achieved guided-mode resonance dips at 1.55 µm (C-band) and 1.31 µm (O-band).
- Demonstrated electro-tunable modulation by exploiting the ENZ effect in ITO.
- Obtained high modulation depths of ~22.3 dB at 1.55 µm and ~19.5 dB at 1.31 µm with applied bias voltages.
Conclusions:
- The proposed metasurface enables dual-band spatial light modulation.
- The device offers active control of light at critical telecommunication wavelengths.
- This work paves the way for dual-band active nanophotonic devices.
