title: Ultrahigh Q whispering gallery mode electro-optic resonators on a silicon photonic chip.
abstract: Crystalline whispering gallery mode (WGM) electro-optic resonators made of LiNbO3and LiTaO3are critical for a wide range of applications in nonlinear and quantum optics, as well as RF photonics, due to their remarkably ultrahigh Q(>108) and large electro-optic coefficient. Achieving efficient coupling of these resonators to planar on-chip optical waveguides is essential for any high-yield and robust practical applications. However, it has been very challenging to demonstrate such coupling while preserving the ultrahigh Q properties of the resonators. Here, we show how the silicon photonic platform can overcome this long-standing challenge. Silicon waveguides with appropriate designs enable efficient and strong coupling to these WGM electro-optic resonators. We discuss various integration architectures of these resonators onto a silicon chip and experimentally demonstrate critical coupling of a planar Si waveguide and an ultrahigh QLiTaO3resonator (Q∼108). Our results show a promising path for widespread and practical applications of these resonators on a silicon photonic platform.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Soltani
authors.forename: Vladimir
authors.initials: V
authors.lastname: Ilchenko
authors.forename: Andrey
authors.initials: A
authors.lastname: Matsko
authors.forename: Anatoliy
authors.initials: A
authors.lastname: Savchenkov
authors.forename: John
authors.initials: J
authors.lastname: Schlafer
authors.forename: Colm
authors.initials: C
authors.lastname: Ryan
authors.forename: Lute
authors.initials: L
authors.lastname: Maleki