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Ultrahigh-efficiency slow-light modulator based on thin-film lithium niobate
Optics Express
|June 11, 2026
Summary
This study introduces a novel slow-light modulator using thin-film lithium niobate for advanced communication. The integrated device achieves high efficiency and bandwidth, paving the way for next-generation photonic applications.
Area of Science:
- Photonics and Materials Science
- Integrated Optics and Electro-Optics
Background:
- Integrated electro-optic modulators are vital for communication and quantum technologies.
- Thin-film lithium niobate is a key material, but miniaturization for high bandwidth and low loss remains challenging.
Purpose of the Study:
- To propose and simulate a high-efficiency, miniaturized slow-light modulator.
- To overcome limitations in current lithium niobate modulator designs for on-chip applications.
Main Methods:
- Heterogeneous integration of a grating on a lithium niobate waveguide.
- Leveraging slow-light effects in high-order photonic modes.
- Optimizing coupling tapers and microstructured electrodes.
Main Results:
- Achieved ultra-high modulation efficiency of 0.67 V·cm with a group index of 9.58.
- Modulator transmittance > 0.8 over a 10 nm bandwidth.
- Demonstrated a 3 dB modulation bandwidth exceeding 130 GHz.
Conclusions:
- The designed slow-light modulator offers exceptional performance metrics.
- This work provides a foundation for advanced integrated photonic devices.
- The proposed configuration addresses key challenges in miniaturized, high-performance modulators.
