| 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 Journal | | Publication date: | Accepted for publication. Not yet published | | Journal/Conference/Book: | Lasers & Photonics Reviews
| | Editor/Publisher: | Wiley, | | DOI: | 10.1002/lpor.202501357 | | 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 fabrication variations. Here, we present a scalable quadratic nonlinear platform that harnesses the maturity and scalability of existing CMOS processes by heterogeneously integrating periodically poled lithium niobate (PPLN) onto a silicon photonics platform. A generic PPLN design enables frequency conversion on two distinct waveguide geometries with efficiencies comparable to LNOI rib waveguides. We achieve reproducible phase-matching across the full radius of a commercial 200 mm silicon photonics wafer, leveraging superior CMOS fabrication tolerances. Furthermore, we introduce a tuning mechanism for both blue- and red-shifting of the operating wavelength, fully compensating fabricationinduced offsets. This enables deterministic phase-matching over an entire wafer and yields a strategy for wafer-scale phase-matched quadratic nonlinearities. Finally, we realize printable photon-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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