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Achieving a Mode-Selective Optical Waveguide in a PIN-PMN-PT Single Crystal via a Nickel In-Diffusion Method
Yuebin Zhang1, Qingyuan Hu1, Xin Liu1
1Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic Information, Xi'an Jiaotong University, Xi'an 710049, China.
Nanomaterials (Basel, Switzerland)
|May 12, 2026
Summary
Researchers developed mode-selective waveguides in lead indium niobate-lead magnesium niobate-lead titanate (PIN-PMN-PT) crystals using nickel in-diffusion. This breakthrough enables high-quality optical waveguides for compact modulators in fiber-optic gyroscopes.
Area of Science:
- Materials Science
- Photonics
- Crystal Engineering
Background:
- Relaxor ferroelectric single crystals like PIN-PMN-PT exhibit exceptional electro-optic properties, crucial for advanced integrated modulators.
- Current fabrication methods for optical waveguides in these materials often result in multi-mode propagation, limiting their use in applications like fiber-optic gyroscopes (FOGs).
Purpose of the Study:
- To develop a fabrication technique for high-quality, mode-selective optical waveguides in rhombohedral PIN-PMN-PT.
- To enable the use of PIN-PMN-PT in single-mode photonic devices, particularly for FOGs and miniaturized inertial navigation systems.
Main Methods:
- Nickel in-diffusion technique applied to rhombohedral PIN-PMN-PT single crystals.
- Characterization of the resulting graded-index optical waveguide structures, including refractive index profile and mode selectivity.
Main Results:
- Fabrication of high-quality optical waveguides with a Gaussian refractive index profile and a maximum refractive index change (Δn) of 1.53%.
- Achieved precise transverse electric (TE) mode selectivity, enabling single-mode propagation.
- Preservation of the single crystal structure throughout the fabrication process.
Conclusions:
- The nickel in-diffusion technique successfully creates mode-selective waveguides in PIN-PMN-PT.
- This method provides a viable platform for developing ultra-compact, low driving voltage modulators.
- The findings support advancements in miniaturized inertial navigation and integrated photonic systems.
