Lithium niobate crystal film for integrated photonic applications

Lithium niobate film on insulator (LNOI) has become a promising photonic platform owning to its electro-optic and nonlinear optical properties. The ultralow-loss and high-confinement nanophotonic waveguides have been fabricated by the complementary metal oxide semiconductor (CMOS)-compatible microstructure engineering of LNOI. Herein, we review the recent progress in CMOS-compatible microstructure engineering and domain engineering of LNOI for integrated lithium niobate photonics. We believe that the great progress in integrated photonics on LNOI would step in a new generation of technique.