摘要
Lithium niobate(LN)has various characteristics superior to other optical materials,such as a wide transparency window and large electro-optic/nonlinear-optic/acousto-optic/pyroelectric coefficients,as well as stable chemical and physical properties.Based on these qualities,various kinds of photonic devices incorporating LN have been demonstrated during the past decades.Among them,bulk LN-based devices are the most deeply explored,but their large size is incompatible with desired trends in energy efficiency and integration.Recently developed high-quality thin-film LN has changed the situation and gained much attention in academia and industry,inaugurating a new era of LN photonics.
