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Ultra-compact electro-optic phase modulator based on a lithium niobate topological slow light waveguide
Optics Express
|February 1, 2024
Summary
Researchers developed a new ultra-compact electro-optic modulator (EOM) using lithium niobate valley photonic crystals. This breakthrough enables highly integrated photonic chips for optical communications and quantum computing.
Area of Science:
- Photonics
- Materials Science
- Quantum Technologies
Background:
- Electro-optic modulators (EOMs) are crucial for optical communications and quantum computing.
- Current EOMs are millimeter-scale, hindering integration onto photonic chips.
- Thin film lithium niobate is a promising material for efficient EOMs.
Purpose of the Study:
- To design and demonstrate a novel, ultra-compact EOM using lithium niobate valley photonic crystal (VPC) structures.
- To overcome the size limitations of conventional EOMs for enhanced on-chip integration.
Main Methods:
- Design of an EOM utilizing lithium niobate valley photonic crystal (VPC) structures.
- Leveraging the slow light effect for a high effective refractive index.
- Exploiting the spin-valley locking effect for high transmittance.
Main Results:
- Achieved an ultra-compact EOM size of 4 μm×14 μm.
- Demonstrated a low half-wave voltage of 1.4 V.
- Obtained high transmittance (0.87) at 1068 nm.
- Ensured compatibility with nanofabrication and immunity to defects.
Conclusions:
- The novel VPC-based EOM design offers a significant advancement in miniaturization for photonic devices.
- This technology opens new avenues for lithium niobate EOMs with broad applications in optical communication and quantum photonic systems.
- The design's robustness and integration potential are key advantages for future photonic chip development.
