A Barium Titanate‐on‐Oxide Insulator Optoelectronics Platform

Electro-optic modulators are among the most important building blocks in optical communication networks. Lithium niobate, for example, has traditionally been widely used to fabricate high-speed due its large Pockels effect. Another material, barium titanate, nominally a 50 times stronger r-parameter and would ordinarily be more attractive material choice such or other applications. In practice, titanate thin films waveguide devices usually grown on magnesium oxide low refractive index, allowing vertical mode confinement. However, crystal quality is normally degraded. Here, group of scandate-based substrates with small lattice mismatch index compared that identified, thus concurrently satisfying high This work provides platform nonlinear on-chip optoelectronics can promising waveguide-based as Mach–Zehnder modulators, wavelength division multiplexing, quantum optics-on-chip.