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Published on: September 5, 2017
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Electrically tunable plasmonic meta-grating on thin film lithium niobate
Optics Express
|August 13, 2025
Summary
This study introduces a novel lithium niobate spatial light modulator using bound states in the continuum (BICs) for efficient, low-power photonic devices. It achieves high-quality factor resonances and significant modulation amplitude, paving the way for advanced optical applications.
Area of Science:
- Photonics and Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Lithium niobate (LN) possesses unique electro-optic properties valuable for photonic devices.
- Bound states in the continuum (BICs) offer high-quality factor resonances for enhanced light-matter interactions.
- Achieving low-power, high-performance tunable photonic devices remains a key challenge.
Purpose of the Study:
- To develop a novel spatial light modulator utilizing the BIC mechanism in lithium niobate.
- To exploit quasi-BIC modes for strong field confinement and enhanced light-matter interactions.
- To demonstrate efficient thermo-optic modulation at low driving voltages.
Main Methods:
- Fabrication of a lithium niobate device with a gold nanograting.
- Intentionally breaking the symmetry of the gold meta-grating to create quasi-BIC modes.
- Characterization of the device's modulation amplitude, tuning efficiency, Q factor, and rise time.
Main Results:
- A high Q factor of 552 was achieved for the quasi-BIC mode.
- Significant thermo-optic modulation amplitude of 23% was demonstrated at a low driving voltage of 1 V.
- A tuning efficiency of 6.59 nm/V was observed at a central wavelength of 1533 nm, with a rise time of 22.8 ms.
Conclusions:
- The developed spatial light modulator effectively leverages BIC mechanisms for high-performance photonic devices.
- The device shows promise for compact, low-power, and tunable optical applications.
- Potential applications include optical communication, sensing, and signal processing.
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