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Bound states in the continuum (BICs) have been extensively studied in varioussystems since its first proposal in quantum mechanics. Photonic BICs can enableoptical mode confinement and provide field enhancement for nonlinear optics,but they have rarely been explored in nonlinear integrated photonic waveguides.Applying BICs in photonic integrated circuits enables low-loss light guidanceand routing in low-refractive-index waveguides on high-refractive-indexsubstrates, which is suitable for integrated photonics with nonlinearmaterials. Here, we report experimental demonstration of second-harmonicgeneration from telecom to near-visible wavelengths on an etchless lithiumniobate platform by using a photonic BIC for the second-harmonic mode. Thedevices feature second-harmonic conversion efficiency of 0.175%W-1cm-2 andexcellent thermal stability with a wavelength shift of only 1.7 nm from25{\deg}C to 100{\deg}C. Our results represent a new paradigm of nonlinearintegrated photonics on a cost-effective and convenient platform, which canenable a broad range of on-chip applications such as optical parametricgeneration, signal processing, and quantum photonics.

Second-Harmonic Generation in Etchless Lithium Niobate Nanophotonic Waveguides with Bound States in the Continuum