Periodic domain inversion in x-cut single-crystal lithium niobate thin film Mackwitz, P. Rüsing, Michael Berth, Gerhard Widhalm, A. Müller, K. Zrenner, Artur We report the fabrication of periodically poled domain patterns in x-cut lithium niobate thin-film. Here, thin films on insulator have drawn particular attention due to their intrinsic waveguiding properties offering high mode confinement and smaller devices compared to in-diffused waveguides in bulk material. In contrast to z-cut thin film lithium niobate, the x-cut geometry does not require back electrodes for poling. Further, the x-cut geometry grants direct access to the largest nonlinear and electro-optical tensor element, which overall promises smaller devices. The domain inversion was realized via electric field poling utilizing deposited aluminum top electrodes on a stack of LN thin film/SiO2 layer/Bulk LN, which were patterned by optical lithography. The periodic domain inversion was verified by non-invasive confocal second harmonic microscopy. Our results show domain patterns in accordance to the electrode mask layout. The second harmonic signatures can be interpreted in terms of spatially, overlapping domain filaments which start their growth on the þz side. AIP Publishing 2016 info:eu-repo/semantics/article doc-type:article text http://purl.org/coar/resource_type/c_6501 https://ris.uni-paderborn.de/record/4237 Mackwitz P, Rüsing M, Berth G, Widhalm A, Müller K, Zrenner A. Periodic domain inversion in x-cut single-crystal lithium niobate thin film. <i>Applied Physics Letters</i>. 2016;108(15). doi:<a href="https://doi.org/10.1063/1.4946010">10.1063/1.4946010</a> eng info:eu-repo/semantics/altIdentifier/doi/10.1063/1.4946010 info:eu-repo/semantics/altIdentifier/issn/0003-6951 info:eu-repo/semantics/altIdentifier/issn/1077-3118 info:eu-repo/grantAgreement/EC/231447078 info:eu-repo/grantAgreement/EC/231447078 info:eu-repo/semantics/closedAccess