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Lithium niobate thin film electro-optic modulator
1The Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, School of Physics and TEDA Applied Physics Institute, Nankai University, Tianjin 300071, People's Republic of China.
Nanophotonics (Berlin, Germany)
|December 16, 2024
Summary
This study presents a new lithium niobate electro-optic modulator using a Fabry-Pérot resonator. It achieves efficient light modulation with a simpler fabrication process and larger amplitudes.
Area of Science:
- Photonics and optical engineering
- Materials science
- Solid-state physics
Background:
- The linear electro-optic effect enables light control via electric fields.
- Lithium niobate (LN) is a key material for electro-optic modulators due to its properties.
- Lithium niobate-on-insulator (LNOI) wafers facilitate compact photonic device development.
Purpose of the Study:
- To develop a novel electro-optic modulator using LNOI.
- To demonstrate efficient modulation of reflected light via spectral resonance shifts.
- To offer a simpler fabrication process and enhanced modulation amplitude.
Main Methods:
- Fabrication of a Fabry-Pérot resonator using a thin LN film and gold electrodes.
- Application of an alternating voltage to induce spectral resonance shifts.
- Measurement of modulation amplitude under applied electric fields.
Main Results:
- Achieved a 2.3% modulation amplitude with ±10 V alternating voltage.
- Demonstrated spectral resonance shifts in the Fabry-Pérot resonator.
- Showcased a simpler fabrication process compared to metasurface modulators.
Conclusions:
- The developed LNOI electro-optic modulator offers efficient light modulation.
- The simpler fabrication and larger modulation amplitudes present advantages over existing technologies.
- This work paves the way for compact electro-optic devices in beam steering, holography, and spatial light modulation.
