We demonstrate a photonic waveguide technology based on a two-material core, in which light is controllably and repeatedly transferred back and forth between sub-micron thickness crystalline layers of Si and LN bonded to one another, where the former is patterned and the latter is not. In this way, the foundry-based wafer-scale fabrication technology for silicon photonics can be leveraged to form lithium-niobate based integrated optical devices. Using two different guided modes and an adiabatic mode transition between them, we demonstrate a set of building blocks such as waveguides, bends, and couplers which can be used to route light underneath an unpatterned slab of LN, as well as outside the LN-bonded region, thus enabling complex and compact lightwave circuits in LN alongside Si photonics with fabrication ease and low cost.
CITATION STYLE
Weigel, P. O., Savanier, M., Derose, C. T., Pomerene, A. T., Starbuck, A. L., Lentine, A. L., … Mookherjea, S. (2016). Lightwave Circuits in Lithium Niobate through Hybrid Waveguides with Silicon Photonics. Scientific Reports, 6. https://doi.org/10.1038/srep22301
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