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FRI: Friday Contributed Sessions
FRI 5: QIP Implementations: Solid-State Devices II
FRI 5.8: Talk
Friday, September 12, 2025, 12:30–12:45, ZHG006
Two-photon polymerization of strip-loaded thin-film lithium niobate waveguides for high-efficient photon pair sources and quantum circuits — •Alexandra Rittmeier1,2, Muhamed A. Sewidan2,3, Elisavet Chatzizyrli1,2, Philipp Gehrke1,2, Laura Bollmers4, Silia Babel4, Laura Padberg4, Christof Eigner4, Christine Silberhorn4, Douglas Bremner5, Anna Karoline Rüsseler1,2, Andreas Wienke1,2, Dietmar Kracht1,2,3, Moritz Hinkelmann1,2, and Michael Kues1,2,3 — 1Laser Zentrum Hannover e.V., Germany — 2PhoenixD, LUH, Germany — 3Institute of Photonics, LUH, Germany — 4Paderborn University, Germany — 5Alter Technology, Livingston, UK
Advancements in integrated photonics are essential for future chip-scale photonic systems and depend on new materials and fabrication methods. Lithium niobate (LN) is highly attractive due to its strong nonlinearity and excellent electro-optical properties. We introduce an etchless fabrication method for strip-loaded thin-film LN waveguides using two-photon polymerization (2PP), achieving low propagation losses of 0.15 dB/cm and rapid production cycles. The approach enables LN substrate reuse, promoting sustainable manufacturing. Using this fabrication approach, we realized a photon pair source with a 201 MHz pair generation rate and a coincidence-to-accidental ratio of 379, outperforming platforms fabricated via etching methods. In addition, we realized key components such as grating and directional couplers, demonstrating the potential of 2PP-fabricated optical components on LN for scalable, high-performance quantum photonic circuits.
Keywords: thin-film lithium niobate; additive manufacturing; entangled photon-pair source; SPDC