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High Q lithium niobate metasurfaces with transparent electrodes for efficient amplitude and phase modulation.
Applied Optics
|June 10, 2024
Summary
Researchers developed a novel, etchless lithium niobate (LN) metasurface for tunable optical devices. This technology enables significant amplitude and phase modulation for advanced nanophotonic applications.
Area of Science:
- Photonics and Nanotechnology
- Materials Science
- Electrical Engineering
Background:
- Lithium niobate (LN) on insulator (LNOI) technology enables integrated electro-optical metadevices.
- Existing metasurfaces often require complex fabrication processes.
- Tunable optical devices are crucial for advanced photonic applications.
Purpose of the Study:
- To propose and demonstrate a high Q-factor, tunable metasurface using etchless lithium niobate.
- To achieve electrically driven vertical modulation of optical properties.
- To lay the foundation for high-performance active nanophotonic devices.
Main Methods:
- Fabrication of an etchless lithium niobate metasurface.
- Electrical tuning using transparent conductive films for vertical field application.
- Utilizing guided mode resonances for amplitude modulation and a gold layer for phase modulation.
Main Results:
- Achieved over 60 dB transmission amplitude modulation at 20 V with a Q factor of 1320.
- Realized approximately 1.75π phase modulation at 80 V with over 92% reflection.
- Demonstrated effective modulation of both optical amplitude and phase in the near-infrared band.
Conclusions:
- The proposed etchless LN metasurface offers a promising platform for tunable optical devices.
- The device provides significant amplitude and phase modulation capabilities.
- This work advances the development of high-performance, active nanophotonic devices.
