| Authors: | T. Vandekerckhove, J. De Witte, L. De Jaeger, E. Vissers, S. Janssen, P. Verheyen, N. Singh, D. Bode, M. Davi, F. Ferraro, P. Absil, S. Balakrishnan, J. Van Campenhout, D. Van Thourhout, G. Roelkens, S. Clemmen, B. Kuyken | | Title: | A scalable quadratic nonlinear silicon photonics platform with printable entangled photon-pair sources | | Format: | International Conference Presentation | | Publication date: | 6/2025 | | Journal/Conference/Book: | European Conference on Integrated Optics
| | Location: | Cardiff, United Kingdom | | Citations: | Look up on Google Scholar
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Abstract
The integration of second-order optical nonlinearities into scalable photonic platforms remains a key challenge due to their large sensitivity to fab-rication variations. Here, we present a scalable quadratic nonlinear platform that harnesses the maturity and scalability of existing CMOS processes by heteroge-neously integrating periodically poled lithium niobate (PPLN) onto a silicon photonics platform. A generic PPLN design enables frequency conversion with efficiencies comparable to LNOI rib waveguides. We achieve reproducible phase-matching across the full radius of a commercial 200 mm silicon photon-ics wafer, leveraging superior CMOS fabrication tolerances. Furthermore, we introduce a tuning mechanism for both blue- and red-shifting of the operating wavelength, fully compensating fabrication-induced offsets. This enables de-terministic phase-matching over an entire wafer and yields a strategy for wafer-scale phase-matched quadratic nonlinearities. Finally, we realize printable pho-ton-pair sources via spontaneous parametric down-conversion, highlighting the platform's potential for large-scale quantum optical circuits. These results pave the way for wafer-scale integration of second-order optical nonlinearities in large photonic systems. Related Research Topics
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