Poling-free Spontaneous Parametric Down Conversion without for Silicon Carbide and Lithium Niobate photonics

• URL: http://arxiv.org/abs/2604.17723v1
• Date: Mon, 20 Apr 2026 02:17:54 GMT
• Title: Poling-free Spontaneous Parametric Down Conversion without for Silicon Carbide and Lithium Niobate photonics
• Abstract summary: We present a device architecture that enables SPDC of a wide range of frequencies without the need for periodic poling.<n>Our design, based on mode conversion and subsequent modal phase-matched SPDC, facilitates a CMOS compatible $(2)$ platform.
• Score: 2.9938147880605612
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: State-of-the-art photon sources based on spontaneous parametric down-conversion (SPDC) currently rely on artificial structuring of the material nonlinearity to satisfy phase-matching conditions. This technique, known as periodic poling, is available only in a limited number of material platforms and introduces additional fabrication steps and errors, which are detrimental to up-scaling efforts. Here, we present a device architecture that enables SPDC of a wide range of frequencies without the need for periodic poling. We present explicit designs and calculations for 4H Silicon Carbide on-insulator, in which SPDC photon generation is so far unavailable, and thin-film Lithium Niobate on-insulator, a state-of-the-art quantum photonics platform. Our design, based on mode conversion and subsequent modal phase-matched SPDC, facilitates a CMOS compatible $χ^{(2)}$ platform, and simplifies photon sources by removing the requirement of periodic poling and the associated additional fabrication complexity.

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