Eulitha showcases its Displacement Talbot Lithography (DTL) technology at Display Week 2026. Kelsey Wolley explains that DTL is a non-contact optical lithography approach designed for scalable, high-yield production of periodic structures at a cost-effective price point. This method is particularly suited for manufacturing augmented reality (AR) waveguides based on line space gratings, offering quality comparable to traditional projection systems but at a fraction of the cost, which is critical for consumer AR glasses.
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One demonstration features a silicon carbide AR waveguide developed with a partner, SEAF, using Eulitha’s DTL to define the surface-relief grating (SRG) waveguides. The company also displays a 12-inch wafer completely filled with AR waveguide designs from partner Dispelix. This is achieved by combining DTL with a step-and-repeat process, enabling seamless and sharp waveguide patterns on large substrates like high-refractive-index glass. These wafers are later cut, or singulated, into individual lenses for assembly into AR glasses.
Eulitha offers a range of manufacturing tools to support different production volumes, from a small tabletop system to a semi-automatic mid-range tool and a fully automated high-volume manufacturing platform. The company’s technology is compatible with various light engine approaches, including LCoS and microLEDs, as the lithography process is independent of the light source chosen by the AR device designer.
The company is continuously evolving its DTL technology to open up new markets. A significant area of development is in the semiconductor laser space. Eulitha has developed a DTL-compatible method for creating gradual phase shifts in periodic structures. This overcomes previous limitations with abrupt pitch changes, enabling the high-throughput, high-precision manufacturing of devices like Distributed Feedback (DFB) lasers.
This phase-shifting capability allows customers to use DTL for fabricating complex laser devices that require precise periodic structures with integrated phase shifts. While the lasers for AR projectors are a different application, the underlying advancement in DTL demonstrates the technology’s expanding capabilities beyond its initial applications, addressing new challenges in photonics and semiconductor manufacturing.
