Strong nonlinear optics in on-chip coupled lithium niobate microdisk photonic molecules
Open Access
- 29 May 2020
- journal article
- research article
- Published by IOP Publishing in New Journal of Physics
- Vol. 22 (7), 073030
- https://doi.org/10.1088/1367-2630/ab97ea
Abstract
High-quality lithium niobate (LN) thin-film microresonators provide an ideal platform for on-chip nonlinear optical applications. The strict phase-matching condition should be satisfied for an efficient nonlinear optical process, which requires dispersion engineering with a LN microresonator. However, this is challenging in single microresonator, resulting from the fabrication error. Here, we demonstrate strong nonlinear effects in a photonic molecule (PM) structure composed of two strongly coupled lithium niobate microdisks. The size mismatch of the microdisks enables phase matching by employing coupling-induced frequency splitting to compensate for the material and geometric dispersion. With a continuous wave excitation, rich nonlinear optical phenomena including cascaded four-wave mixing and stimulated Raman scattering were observed around the second harmonic signal. Meanwhile, an ultra-high four-wave mixing conversion efficiency with a rough estimation of absolute conversion efficiency with 14% as obtained when the second harmonic signal power is at microwatts level. The coupled LN microdisk PM is of great potential for broad applications in nonlinear integrated photonics.Keywords
Funding Information
- Ministry of Science and Technology (2018YFB2200400 2019YFA0705000)
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