Acoustic Layer Separation for Thin Film Lithium Niobate

Thin Film Lithium Niobate (TFLN) technologies are revolutionizing high-speed communications, quantum computing, artificial intelligence, and precision sensing, making them critical for defense and commercial applications. However, existing fabrication methods such as Smart Cut (ion implantation) and backgrinding are costly, wasteful, and reliant on foreign supply chains. Sonic Lift-Off (SLO), a novel acoustic-based wafer reuse and layer separation process, addresses these challenges by enabling defect-free thin layer separation with significant cost and material savings. SLO technology, patented and developed by Crystal Sonic, employs acoustic energy and a polymeric stressor to initiate and propagate a controlled crack front, achieving precise separation of thin layers (<50 µm) without introducing crystalline defects. Unlike traditional methods, SLO ensures substrate reusability, minimal surface roughness, and scalability to larger wafer diameters. This project aims to: Demonstrate SLO feasibility for 2” and 4” LiNbO3 wafers.Develop a 6” SLO test platform with enhanced acoustic delivery capabilities.Investigate TFLN application requirements and market opportunities.Engage with commercial and government stakeholders to document customer workflows and integration needs. Building on the success of prior R&D efforts with GaAs, GaN, and SiC materials, Crystal Sonic has demonstrated the scalability of SLO to 4” diameters. This project will extend these advancements to LiNbO3, leveraging existing expertise to develop optimized recipes for various wafer orientations and thicknesses. The impact of this work is significant, establishing an onshore, cost-effective method for TFLN manufacturing that addresses supply chain vulnerabilities and supports dual-use applications. The resulting SLO test platform will provide a foundation for future commercialization, enabling compatibility with industry-standard 6” wafers and driving further innovation in advanced semiconductor manufacturing.